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WO2011016378A1 - Dispositif de résonance optique à trois dimensions, procédé d’oscillation laser polarisée, et système d’oscillation laser polarisée - Google Patents

Dispositif de résonance optique à trois dimensions, procédé d’oscillation laser polarisée, et système d’oscillation laser polarisée Download PDF

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Publication number
WO2011016378A1
WO2011016378A1 PCT/JP2010/062749 JP2010062749W WO2011016378A1 WO 2011016378 A1 WO2011016378 A1 WO 2011016378A1 JP 2010062749 W JP2010062749 W JP 2010062749W WO 2011016378 A1 WO2011016378 A1 WO 2011016378A1
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Prior art keywords
laser
optical resonator
polarized
pulse
laser light
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PCT/JP2010/062749
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English (en)
Japanese (ja)
Inventor
順治 浦川
洋介 本田
洋孝 清水
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Kagawa University NUC
Inter University Research Institute Corp High Energy Accelerator Research Organization
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Kagawa University NUC
Inter University Research Institute Corp High Energy Accelerator Research Organization
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Priority claimed from JP2009182788A external-priority patent/JP2011035328A/ja
Priority claimed from JP2009182869A external-priority patent/JP2011034006A/ja
Application filed by Kagawa University NUC, Inter University Research Institute Corp High Energy Accelerator Research Organization filed Critical Kagawa University NUC
Priority to CA2807120A priority Critical patent/CA2807120C/fr
Publication of WO2011016378A1 publication Critical patent/WO2011016378A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/001—Optical devices or arrangements for the control of light using movable or deformable optical elements based on interference in an adjustable optical cavity
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G2/00—Apparatus or processes specially adapted for producing X-rays, not involving X-ray tubes, e.g. involving generation of a plasma

Definitions

  • the present invention relates to a small X-ray source resonator that generates X-rays using laser inverse Compton scattering, a polarization laser oscillation method, and a polarization laser oscillation system.
  • a laser that is currently obtained with a laser generator is guided to an optical resonator and resonated to generate a strong polarized laser.
  • the method of making it known is known.
  • the circular resonator of the laser cannot be separated by an optical resonator using two mirrors, so that a polarizer, a Faraday rotator, a ⁇ / 4 wavelength plate, etc. Therefore, the circularly polarized light must be switched, and there is a problem that adjustment is troublesome.
  • the polarizer, the Faraday rotator, the ⁇ / 4 wavelength plate, etc. must be adjusted to switch between the right circularly polarized light and the left circularly polarized light, so that the switching speed is increased. This is not only difficult, but also cannot be guaranteed to be a purely circularly polarized laser.
  • the polarized laser generator using such a polarized laser generating method is used for an X-ray source that generates X-rays by utilizing laser inverse Compton scattering or the like because the entire apparatus becomes large.
  • the X-ray source will be enlarged.
  • the present invention can guide a laser obtained by a laser light source to an optical resonator configured in a three-dimensional manner to resonate with either right polarization or left polarization and easily switch between them. It is an object of the present invention to provide a polarization laser oscillation method using an optical resonance device capable of performing the above.
  • the present invention further provides a high-energy electron beam emitted from a high-energy electron beam generator at a collision point set in a three-dimensional optical resonator and a collision point in the three-dimensional optical resonator.
  • Polarized light that generates ultrashort pulsed polarized radiation by colliding with a right-polarized pulse laser or a left-polarized pulse laser having a beam size of “10 ⁇ m” or less and an energy intensity of “1 mJ / pulse” or more.
  • An object is to provide a laser oscillation system.
  • the present invention has, as its first form, a pair of plane mirrors and a pair of concave mirrors arranged in a three-dimensional manner, and receives laser light emitted from a laser light source device.
  • the laser light is picked up by an optical system, and the laser light is selected by selecting the right circularly polarized light or the left circularly polarized light according to the adjusted optical path length while circling on the optical path whose optical path length is adjusted by the piezoelectric element. It is an object of the present invention to provide a three-dimensional optical resonator having an optical resonator formed to resonate.
  • the laser light source device includes a CW laser oscillator or a mode-locked laser pulse oscillator as a laser oscillator, and a polarization plane and a beam diameter of a laser emitted from a laser light source that generates a laser of a CW laser type or a pulse laser type. To arrange.
  • a resonance monitor device for measuring the intensity of the laser beam resonating in the optical resonator, and transmitting either the plane mirror or the concave mirror among the laser beams resonating in the optical resonator.
  • the laser is separated into a P-polarized component and an S-polarized component, the intensity of each polarized component is measured, and a zero-cross feedback signal generator that generates a zero-cross feedback signal by obtaining a difference value thereof is provided.
  • the three-dimensional optical resonator includes a polarization switch that outputs an instruction signal designating the selected right circular polarization or left circular polarization, an output of the polarization switch, an output of the resonance monitor device, and the zero cross Based on the output of the feedback signal generator, the drive voltage of the piezoelectric element provided in the optical resonator is controlled to adjust the optical path length, and right circularly polarized light or left circularly polarized light is adjusted in the optical resonator. And a resonance controller for selectively storing the laser.
  • a right-polarized pulse laser or a left-polarized pulse laser having a beam size of “10 ⁇ m” or less and an energy intensity of “1 mJ / pulse” or more and the aforementioned It collides with an electron beam emitted from the incident optical system, and generates ultrashort pulse polarized radiation whose radiation dose is measured.
  • an electron beam having a normalized emittance of “10 mmrad” or less emitted from the laser light source device and a pulse laser in the optical resonator are in a collision angle range of “8 to 20 degrees”, and Collisions are made with a collision accuracy of “1 ⁇ m” or less, and X-ray or ⁇ -ray ultrashort pulse polarized radiation having a characteristic of energy of “0.25 keV” or more is generated and extracted outside.
  • laser light emitted from a laser light source device is guided to an optical resonator, and the laser light is circulated by a pair of plane mirrors and a pair of concave mirrors in the optical resonator.
  • the optical path length in the optical resonator is adjusted by deforming the piezoelectric element by applying a lamp-like driving voltage, and the P-polarized component and S-polarized component of the laser transmitted from the concave mirror or the plane mirror are separated.
  • Measuring the intensity of each polarization component generating a zero-cross feedback signal based on a difference value of the intensity of the polarization component, fixing the voltage value of the drive voltage, and right-polarized laser or left in the optical resonator.
  • the present invention provides a polarized laser oscillation method characterized by resonating and accumulating a polarized laser.
  • the present invention further includes, as a third embodiment, a laser light source that has at least one of a CW laser oscillator and a mode-locked laser pulse oscillator and generates a CW laser type or pulse laser type laser, and the laser light source.
  • the incident optical system that adjusts the polarization plane and beam diameter of the emitted laser, and the laser beam emitted from the laser light source device is captured by the incident optical system, and the laser beam is adjusted on the optical path whose optical path length is adjusted by the piezoelectric element.
  • An optical resonator formed to resonate the laser beam by selecting right circularly polarized light or left circularly polarized light according to the adjusted optical path length while rotating, and resonating in the optical resonator Resonance monitor device for measuring the intensity of the laser, and each of the planes among the lasers resonating in the optical resonator
  • the laser beam transmitted through one of the concave mirrors is separated into P-polarized light and S-polarized light, its intensity is measured, and a difference value is obtained to generate a zero-cross feedback signal, and the light
  • a polarization changeover switch that outputs an instruction signal specifying right circular polarization or left circular polarization selected by the resonator, an output of the polarization changeover switch, an output of the resonance monitor device, and an output of the zero-cross feedback signal generator
  • controlling the drive voltage of the piezoelectric element provided in the optical resonator to adjust the optical path length, and selectively storing right-circularly polarized light or left-circular
  • the present invention can guide the laser obtained by the laser light source to the three-dimensionally configured optical resonator so that it can resonate with either right-polarized light or left-polarized light and easily switch between them. This enables polarized laser oscillation using a three-dimensional optical resonator capable of performing
  • the present invention further provides a high-energy electron beam emitted from the high-energy electron beam generator at the collision point set in the optical resonator and a beam size generated at the collision point in the optical resonator.
  • a polarized laser oscillation system that generates ultrashort pulsed polarized radiation by colliding with a right-polarized pulse laser or a left-polarized pulse laser with an energy intensity of 10 ⁇ m or less and an energy intensity of 1 mJ / pulse or more. .
  • HC Hasch-Couillaud
  • a four-mirror optical resonator having a three-dimensional (non-planar) configuration can generate a minute spot at one point inside the optical resonator. If a laser Compton X-ray source is used, an effective laser electron intersection can be provided with a four-mirror optical resonator, and the generated X-ray performance (or convergence performance) can be improved.
  • Non-planar optical resonators usually have circular polarization dependence characteristics due to image rotation in a three-dimensional optical path.
  • the inventor proposes a new method for obtaining a differential signal from resonance of a non-planar optical resonator by using this circular polarization dependence characteristic.
  • This method is a modification of the “HC method” having circular polarization dependence.
  • FIG. 4 shows the configuration of the non-planar four-mirror optical resonator of the present invention.
  • the optical path is along the sides of a symmetrical tetrahedron whose surface is an isosceles triangle having sides “a”, “a”, “b”.
  • the side “a” is “420 mm”, and the side “b” is “100 mm”.
  • Each mirror at each vertex “P 1 ”, “P 2 ”, “P 3 ”, “P 4 ” forms a closed optical resonator in this order.
  • the mirrors of the vertices “P 1 ” and “P 2 ” are plane mirrors, and the mirrors of the vertices “P 3 ” and “P 4 ” are concave mirrors.
  • Each mirror (plane mirror, concave mirror) used in this experiment has a reflectance of “99%” and a transmittance of “1%”.
  • the point “Q 1 ” is a midpoint between the vertex “P 1 ” and the vertex “P 3 ”.
  • the point “Q 2 ” is a midpoint between the vertex “P 2 ” and the vertex “P 4 ”.
  • the unit vector “k 1 ” and vector “k 2 ” are respectively the rays from vertex “P 1 ” to vertex “P 2 ” and vertex “P 2 ” to vertex “P”. 3 "ray (incident light).
  • the normal vector “n 1 ” and the vector “n 2 ” of the reflected light at the vertex “P 2 ” and the vertex “P 3 ” can be expressed by the following equations.
  • the plane including incident light and reflected light uses the definitions of unit vectors “k 1 ” and “k 2 ” and normal vectors “n 1 ” and “n 2 ”, and is expressed by the following equation:
  • the vectors “a 1 ” and “a 2 ” can be used.
  • the angle “ ⁇ 12 ” between the vector “a 1 ” and the vector “a 2 ” is the rotation of the image that occurred on one side of the four-mirror optical resonator, and the angle “ ⁇ 12 ” It can be calculated by the following formula.
  • the rotation of the image at each reflection point is accumulated. Therefore, when the optical path in the non-planar optical resonator is rotated once, the overall effect is an angle “4 ⁇ 12 ”. (Hereafter, this is referred to as the geometric phase “ ⁇ geo ” when appropriate). Further, the rotation of the image corresponds to a phase shift in the case of a rotationally polarized wave. Also, since the signs of the phase shifts of the right polarization and the left polarization are opposite, the resonance decay between the two circular polarizations is divided.
  • the angle “4 ⁇ 12 ” is “ ⁇ 0.0575 rad (ignoring an integer of 2 ⁇ )” in our proposed resonator.
  • a single mode CW laser (Innolite, Prometheus model) was used as a light source. Polarization of incident laser light was discriminated by a polarizing beam splitter (PBS). A matching pair was placed so that the incident laser matched the optical resonator, the natural mode. The incident position and angle of the incident laser with respect to the optical resonator (3D-4mirror cavity) were adjusted with a pair of plane mirrors.
  • One of the optical resonator mirrors (concave) is mounted on a piezoelectric control stage having a piezo element so that the length of the optical resonator (optical path length) can be changed.
  • the resonance of the optical resonator was determined by measuring the transmitted laser of the optical resonator with a pin photodiode (PD) while applying a lamp voltage (voltage that increases sequentially in a slope shape) to the piezo element.
  • PD pin photodiode
  • FIG. 6 shows a typical signal that can be observed when the incident laser has linear polarization. It is a graph when the transmission laser of an optical resonator is measured with a photodiode while scanning the optical path length of the optical resonator using a piezo element. The upper figure shows the entire period of the free spectral range. The highest peak corresponds to the basic transverse mode. The figure below is an enlargement of one of the basic mode peaks.
  • the two resonance peaks have a double peak structure in which one corresponds to right polarization and the other corresponds to left polarization. Since the linear polarization of the incident laser contains the same amount of the two circular polarizations, the optical resonator resonates at a slightly different phase based on both resonance conditions.
  • E i is the complex resonance of the incident wave
  • R 1 and T 1 are the reflectance and transmittance of the resonant mirror disposed at the entrance / exit of the optical resonator.
  • R can be considered as the reflectance of the resonant mirror used in the two-mirror optical resonator having the same accuracy as that of the four-mirror optical resonator.
  • ⁇ is a phase difference derived from the resonance condition.
  • the upper line shows the real part of the phase difference “ ⁇ ”, and the lower line shows the imaginary part of the phase difference “ ⁇ ”.
  • the polarization of the wave can be described using the following equation.
  • the respective elements “E p ” and “E s ” of the column vector “E” represent P-polarized light and S-polarized light, respectively.
  • the electric field is parallel and perpendicular to the table. If the wave is demultiplexed by a polarizing beam splitter (PBS) placed horizontally on a table, the two elements can be measured separately.
  • PBS polarizing beam splitter
  • a circularly polarized wave can be described as follows.
  • the column vectors “E R ” and “E L ” are the unit resonance right polarization and left polarization, respectively. Since the eigenstate of the non-planar optical resonator corresponds to circularly polarized light, the incident wave can be conveniently described as a superposition of the right polarized unit resonance “E R ” and the left polarized unit resonance “E L ”.
  • the column vector “E 45 ”, which is a unit resonance of linearly polarized light rotated by 45 degrees with respect to the table surface, can be described as follows.
  • Equation 8 when Equation 8 is an incident wave, the right polarization component “E r R ” and the left polarization component “E r L ” of the reflected wave interact with each other in the optical resonator.
  • the resulting superimposed reflected wave “E r ” is expressed by the following equation.
  • component of the reflected wave "E r""E s r ", and the difference signal "E s r -E p r" of the "E p r” to calculate the sum signal "E s r + E p r ", the plot It is a thing.
  • the difference signal "E s r -E p r" as “PD1-PD2” is displayed, and the added signal “E s r + E p r " , “PD1 + PD2” is displayed.
  • the pin photodiode “PD1” monitored the intensity “E p ” of P-polarized light as the reference of the polarization beam splitter “PBS”, and the pin photodiode “PD2” monitored the intensity of S-polarized light “E s ”.
  • Signals from the respective pin photodiodes “PD1” and “PD2” were supplied to a differential amplifier “differential amplifier”, and a differential voltage “E s ⁇ E p ” was output as an output signal “output”.
  • FIG. 11 shows signals observed near the resonance point of the three-dimensional optical resonator “3D-cavity”.
  • the bottom line is the signal of the pin photodiode “PD0” that measured the transmitted light. This shows the resonance point of the three-dimensional optical resonator “3D-cavity”.
  • the center line is the output signal “output” of the differential amplifier “differential amplifier”, and the shape of this output signal matches the result calculated in FIG.
  • the output signal “output” of the differential amplifier “differential amplifier” crossed zero at each of the two resonance points, and had different signs in the vicinity of the respective circularly polarized peaks. Accordingly, if the optical path length of the three-dimensional optical resonator “3D-cavity” is adjusted so that the output signal “output” of the differential amplifier “differential amplifier” coincides with one of the zero crossings, the three-dimensional light It can be locked to one of the two resonance peaks of the resonator “3D-cavity”.
  • the three-dimensional optical resonator “3D-cavity” is locked to one of the two resonance peaks of the three-dimensional optical resonator “3D-cavity”. "Can be made to resonate with both right and left polarized light.
  • FIG. 1 is a schematic configuration diagram showing an embodiment of a polarization laser oscillation method and a polarization laser oscillation system according to the present invention using the principle described above.
  • the polarization laser oscillation system 1 shown in this figure has a CW laser oscillator and a mode-locked laser pulse oscillator, and generates a laser such as a CW laser or a pulse laser, and a polarization plane of the laser emitted from the laser light source 2.
  • the incident optical system 3 for adjusting the beam diameter, and the three-dimensional light that receives the laser emitted from the incident optical system 3 and selects and stores right circularly polarized light or left circularly polarized light according to the adjusted optical path length.
  • the resonator 4, the resonance monitor device 5 that monitors the intensity of the laser that resonates in the three-dimensional optical resonator 4, and the laser that resonates in the three-dimensional optical resonator 4 pass through the plane mirror 21.
  • the laser beam is separated into P-polarized light and S-polarized light, its intensity is measured, and the difference value is obtained to generate a zero-cross feedback signal.
  • the optical path length of the three-dimensional optical resonator 4 is controlled, and a right circularly polarized light or a left circularly polarized laser is selectively accumulated in the three-dimensional optical resonator 4.
  • the resonance controller 8 includes a resonance controller 8 based on an instruction signal output from the polarization switch 7, a monitoring result of the resonance monitor device 5, a zero-cross detection signal output from the zero-cross feedback signal generator 6, and the like.
  • the time width within the three-dimensional optical resonator 4 is within 30 psec, the beam size is “10 ⁇ m” or less, and the energy is strong.
  • a left-right circularly polarized high-intensity pulse laser having a degree of "1 mJ / pulse" or more is generated.
  • the laser light source 2 includes a CW laser oscillator that generates a CW laser, a mode-locked laser pulse oscillator that generates a pulsed laser, and the like. Based on an instruction from the resonance controller 8, the CW laser oscillator and the mode-locked laser pulse oscillator One of them is activated to generate a laser such as a CW laser or a pulse laser and enter the incident optical system 3.
  • the incident optical system 3 is arranged on a plurality of plane mirrors 9 that guide the laser emitted from the laser light source 2 to the three-dimensional optical resonator 4, and on the optical path defined by each of these plane mirrors 9, and is emitted from the laser light source 2.
  • a laser emitted from the laser light source 2 is provided with a plurality of collimating lenses 10 for adjusting the beam diameter of the laser and a polarizing beam splitter 11 which is installed on an optical path defined by each plane mirror 9 and makes the laser linearly polarized light. The polarization plane and the beam diameter are adjusted, and are incident on the three-dimensional optical resonator 4.
  • the three-dimensional optical resonator 4 is made of a material that has a low coefficient of thermal expansion and is not easily damaged by an electron beam or radiation, and is provided in a collision chamber provided in an emission path of a high-energy electron beam generator.
  • Two ring members 12 and 13 that are formed to be storable and made of a material that has a low coefficient of thermal expansion and is not easily damaged by an electron beam or radiation, and separates each ring member 12 in parallel by a predetermined distance. It is composed of four rod members 14 and a material that has a low coefficient of thermal expansion and is not easily damaged by electron beams or radiation, and is attached to one ring member 12 so as to be inclined by “45 degrees” clockwise relative to the horizontal direction.
  • Each round plate formed on the flat plate 15 is made of a material to be attached and a material having a low thermal expansion coefficient and hardly damaged by an electron beam or radiation. It is composed of two reflector holding frames (stages) 16 and 17 that are attached to the surface, and a material that has a low coefficient of thermal expansion and is not easily damaged by an electron beam or radiation, and is "45 degrees" counterclockwise with respect to the horizontal direction.
  • the flat plate 18 attached to the other ring member 13 so as to incline, and two materials attached to each round hole formed in the flat plate 18 are made of a material having a small coefficient of thermal expansion and not easily damaged by an electron beam or radiation. Reflecting mirror holding frames (stages) 19 and 20 are provided.
  • the three-dimensional optical resonator 4 has the reflectance set to “0.999” and the transmittance set to “0.001”, and the incident optical system 3 among the reflecting mirror holding frames 16, 17, 19, and 20.
  • a plane mirror 21 that is attached to the reflector holding frame 16 disposed at the entrance of the laser beam emitted from the laser beam and transmits the laser beam emitted from the incident optical system 3 and reflects the laser beam from the other ring member 13 side;
  • the ring facing the ring member 12 provided with the plane mirror 21 among the reflecting mirror holding frames 16, 17, 19, 20 is set with a reflectance of “0.999” and a transmittance of “0.001”.
  • the flat mirror 22 that is installed on the reflection mirror holding frame 19 of the member 13 and transmits the laser reflected by the plane mirror 21 and the laser reflected by the plane mirror 21 has a reflectance of “0.999” and a transmittance of “0.001”. ”
  • the laser is installed on the reflecting mirror holding frame 17 of the ring member 12 provided with the plane mirror 21, reflects the laser reflected by the plane mirror 22, and passes through the electron beam path. 37, the concave mirror 23 for condensing light so that the beam size becomes “10 ⁇ m” or less at the collision point set on 37, the reflectance is set to “0.999”, and the transmittance is set to “0.001”.
  • the laser collimated by the concave mirror 23 is installed in the reflecting mirror holding frame 20 of the ring member 13 facing the ring member 12 provided with the concave mirror 23.
  • the concave mirror 24 is returned to the plane mirror 21, and is disposed between the concave mirror 24 and the reflecting mirror holding frame 20, is deformed according to the drive voltage supplied from the resonance controller 8, and adjusts the position of the concave mirror 24.
  • the piezoelectric element 25 is provided.
  • the laser beam emitted from the incident optical system 3 is captured and confined in the path of the plane mirror 21 ⁇ the plane mirror 22 ⁇ the concave mirror 23 ⁇ the concave mirror 24 ⁇ the plane mirror 21, and right circularly polarized light according to the optical path length adjusted by the piezo element 25.
  • left circularly polarized light is selected and stored.
  • the resonance monitoring device 5 receives a laser beam reflected by the plane mirror 26 that reflects the laser beam that has passed through the plane mirror 22 of the three-dimensional optical resonator 4, and a monitor signal having a voltage value corresponding to the laser intensity. And a pin photodiode 27 for generating (a signal indicating the intensity of the laser resonating in the three-dimensional optical resonator 4), and measuring the intensity of the laser transmitted through the plane mirror 22 of the three-dimensional optical resonator 4. Then, a monitor signal is generated and supplied to the resonance controller 8.
  • the zero-cross feedback signal generator 6 reflects the laser that has passed through the plane mirror 21 among the lasers resonating in the three-dimensional optical resonator 4, and places it at a predetermined distance from the three-dimensional optical resonator 4.
  • a plurality of guiding plane mirrors 28, a ⁇ / 2 wavelength plate 29 that adjusts the polarization angle of the laser reflected by the plane mirror 28 at the final stage, adjusted to a mounting angle according to the distance from the three-dimensional optical resonator 4, and ⁇ /
  • a polarization beam splitter 30 that separates the laser whose polarization plane is adjusted by the two-wavelength plate 29 into P-polarized light and S-polarized light
  • a plane mirror 31 that reflects the S-polarized laser separated by the polarization beam splitter 30, and a plane mirror 31.
  • a pin photodiode 32 that receives the reflected S-polarized laser and generates an S-polarized intensity signal indicating the laser intensity on the S-polarized light and the polarization beam splitter 30 separate the laser.
  • a plane mirror 33 that reflects the separated P-polarized laser, and a pin photodiode 34 that receives the P-polarized laser reflected by the plane mirror 33 and generates a P-polarized intensity signal indicating the P-polarized laser intensity;
  • the differential amplifier 35 that calculates the difference between the S-polarized light intensity signal output from the pin photodiode 32 and the P-polarized light intensity signal output from the pin photodiode 34 and generates a difference signal is output from the differential amplifier 35.
  • the difference signal is zero-crossed, whether it is zero-crossed, zero-crossed from the plus side to the minus side, zero-crossed from the minus side to the plus side, etc., and a zero-cross feedback signal indicating these judgment results
  • the laser that has passed through the plane mirror 21 is taken in, separated into P-polarized light and S-polarized light, the intensity is measured, and the difference value is obtained to determine whether the difference signal is zero-crossed.
  • a zero cross feedback signal indicating whether or not zero crossing from the negative side to the negative side or zero crossing from the negative side to the positive side is generated and supplied to the resonance controller 8.
  • the polarization changeover switch 7 corresponds to an instruction signal designating right circular polarized light (or left circular polarized light) or a high frequency signal output from the high frequency signal generator according to the setting content, and right circular polarized light, left An instruction signal or the like that alternately designates circularly polarized light is generated and supplied to the resonance controller 8.
  • the resonance controller 8 includes a calculation board on which a microprocessor for performing various calculations or an LSI incorporating a calculation function is mounted. An instruction signal output from the polarization switch 7 and an output from the resonance monitor device 5 are provided. Necessary for selecting the right circularly polarized light or the left circularly polarized laser in the ramp-shaped voltage value or the three-dimensional optical resonator 4 based on the monitored monitor signal and the zero-cross feedback signal output from the zero-cross feedback signal generator 6.
  • the optical path length of the three-dimensional optical resonator 4 is controlled, and a right circle is formed in the three-dimensional optical resonator 4.
  • a polarized or left circularly polarized laser is selectively accumulated.
  • the activation switch of the polarization laser oscillation system 1 When the activation switch of the polarization laser oscillation system 1 is turned on and the emission of a laser such as a CW laser from the laser light source 2 is started, the polarization plane and the beam diameter of the laser are adjusted by the incident optical system 3, and the three-dimensional The laser that is incident on the plane mirror 21 of the optical resonator 4 and is transmitted through the plane mirror 21 is confined by a path of the plane mirror 21 ⁇ the plane mirror 22 ⁇ the concave mirror 23 ⁇ the concave mirror 24 ⁇ the plane mirror 21.
  • the resonance monitor device 5 measures the intensity of the laser beam that has passed through the plane mirror 22 of the three-dimensional optical resonator 4, generates a monitor signal, and supplies it to the resonance controller 8.
  • the laser that has passed through the plane mirror 21 among the lasers resonating in the three-dimensional optical resonator 4 is taken in by the zero-cross feedback signal generator 6 and converted into P-polarized light and S-polarized light. It is separated, its intensity is measured, its difference value is determined, it is determined whether or not it is zero-crossed, and a zero-cross feedback signal is generated and supplied to the resonance controller 8.
  • the resonance controller 8 In parallel with this operation, the resonance controller 8 generates a driving voltage having a ramp-like voltage value, which is supplied to the piezo element 25 in the three-dimensional optical resonator 4 and supplied to the three-dimensional optical resonator 4. Is adjusted.
  • the instruction signal output from the polarization changeover switch 7 specifies either right circular polarization or left circular polarization, for example, right circular polarization.
  • the zero-cross feedback signal generator 6 converts the right circular polarization into right circular polarization.
  • the optical path length in the three-dimensional optical resonator 4 is fixed at that time, and the resonance for the right circularly polarized laser is maintained in the three-dimensional optical resonator 4 for a specified time.
  • the line width of the pulse laser is determined by the mode-locked oscillation frequency and the time radiation of the pulse laser, and the beam size of the pulse laser at the collision point is not more than “10 ⁇ m” in the three-dimensional optical resonator 4. Therefore, if the time width of the pulse laser is within “30 psec”, the energy intensity at the collision point in the three-dimensional optical resonator 4 can be set to “1 mJ / pulse” or more.
  • the line width of the pulse laser is determined by the mode-locked oscillation frequency and the time radiation of the pulse laser.
  • the beam size of the pulse laser at the collision point is less than “10 ⁇ m”. Therefore, if the time width of the pulse laser is within “30 psec”, the energy intensity at the collision point in the three-dimensional optical resonator 4 can be set to “1 mJ / pulse” or more.
  • the laser obtained by the laser light source 2 can be guided to the three-dimensional optical resonator 4 to resonate with either right polarization or left polarization, and the polarization changeover switch 7 can be operated. You can easily switch between them.
  • the high-intensity pulse laser obtained by the laser light source 2 can be guided to the three-dimensional optical resonator 4 to resonate with either the right polarization or the left polarization, and the three-dimensional optical resonator.
  • a pulse laser having a beam size of “10 ⁇ m” or less and an energy intensity of “1 mJ / pulse” or more can be generated at a collision point provided in 4.
  • the high-intensity pulse laser obtained with the laser light source 2 and having a time width of “30 psec” or less is guided to the three-dimensional optical resonator 4 to resonate with either right-polarized light or left-polarized light.
  • a pulse laser having a beam size of “10 ⁇ m” or less and an energy intensity of “1 mJ / pulse” or more can be generated at a collision point provided in the three-dimensional optical resonator 4.
  • the high-intensity pulse laser obtained by the laser light source 2 is guided to the three-dimensional optical resonator 4, and the beam size is “10 ⁇ m” or less at the collision point provided in the three-dimensional optical resonator 4.
  • a right-polarized pulse laser and a left-polarized pulse laser with energy intensity of “1 mJ / pulse” or more can be generated alternately.
  • FIG. 3 is a schematic configuration diagram showing an example of a polarized radiation generation method and a polarized radiation generation system using the polarized laser oscillation system 1 shown in FIG.
  • parts corresponding to those in FIGS. 1 and 2 are denoted by the same reference numerals.
  • the polarized radiation generation system 51 shown in this figure has a high-frequency signal generation device 52 that generates a high-frequency signal necessary for synchronizing the system, and an accelerator, and a high-frequency signal that is synchronized with the high-frequency signal output from the high-frequency signal generation device 52.
  • a high-energy electron beam generator 53 that emits an electron beam by accelerating electrons using voltage, a laser light source, a mode-locked laser oscillator, etc., and a laser or high-frequency signal generator 52 obtained by CW oscillation
  • the collision angle between the polarized laser oscillation system 1 that generates a pulse laser synchronized with the high-frequency signal output from the high-frequency electron beam generator 53 and the laser in the three-dimensional optical resonator 4 is 8 Polarized laser oscillation system so that it will collide with a collision accuracy within -1 degree and within the range of -20 degrees.
  • the three-dimensional optical resonator 4 constituting the system 1 is housed, and a collision chamber 54 that generates radiation by inverse Compton scattering generated when colliding with the laser in the three-dimensional optical resonator 4 and the collision chamber 54
  • a radiation detection device 55 that extracts radiation and measures the radiation dose is provided.
  • the high-energy electron beam generator 53 and the polarization laser oscillation system 1 are completely synchronized with the high-frequency signal output from the high-frequency signal generation device 52 while the three-dimensional optical resonator 4 of the polarization laser oscillation system 1 is in synchronism.
  • a polarized pulse laser is generated, and a high energy electron beam having a high quality characteristic of a normalized emittance of “10 mmrad” or less is emitted from the high energy electron beam generator 53, and these high energy electron beams are generated in the collision chamber 54.
  • extremely short pulsed polarized radiation having an energy of “0.25 keV” or more is generated by inverse Compton scattering, and the radiation detection device 55 extracts the radiation and guides the radiation to the outside.
  • the amount of radiation can be measured and displayed on a display (not shown).
  • the high-energy electron beam emitted from the high-energy electron beam generator 53 at the collision point set in the three-dimensional optical resonator 4 and the collision point in the three-dimensional optical resonator 4 Is generated by colliding with a right-polarized pulse laser or a left-polarized pulse laser having a beam size of “10 ⁇ m” or less and an energy intensity of “1 mJ / pulse” or more. be able to.
  • a high-energy electron beam having a high quality characteristic of a normalized emittance of “10 mmrad” or less emitted from the high-energy electron beam generator 53 at a collision point set in the three-dimensional optical resonator 4 A right-polarized pulse laser or a left-polarized pulse laser generated at a collision point in the three-dimensional optical resonator 4 and having a beam size of “10 ⁇ m” or less and an energy intensity of “1 mJ / pulse” or more; Colliding with a collision angle of “8-20 degrees”, which is almost a frontal collision, and with a collision accuracy of “1 ⁇ m” or less, to generate ultrashort pulsed polarized radiation having a characteristic of energy of “0.25 keV” or more. be able to.
  • Either one of the circularly polarized high intensity polarized pulse lasers collides with a collision angle in the range of “8-20 degrees” which is almost a frontal collision and with a collision accuracy within “1 ⁇ m”, and the energy is “0”. It is possible to generate ultrashort pulse polarized radiation having a characteristic of .25 keV ′′ or higher.
  • ⁇ rays can be generated.
  • the present invention relates to a polarized laser oscillation method, a polarized radiation generation method and apparatus and system for a small X-ray source that generates X-rays using laser inverse Compton scattering and the like.
  • the present invention relates to a polarized laser oscillation method, a polarized radiation generation method and a system thereof, and has industrial applicability.
  • Polarized laser oscillation system 2 Laser light source 3: Incident optical system 4: Three-dimensional optical resonator 5: Resonance monitor device 6: Zero-cross feedback signal generator 7: Polarization switch 8: Resonance controller 9: Plane mirror 10: Collimate Lens 11: Polarizing beam splitter 12: Ring member 13: Ring member 14: Bar member 15: Flat plate 16: Reflector holding frame 17: Reflector holding frame 18: Flat plate 19: Reflector holding frame 20: Reflector holding frame 21: Plane mirror 22: Plane mirror 23: Concave mirror 24: Concave mirror 25: Piezo element (piezoelectric element) 26: plane mirror 27: pin photodiode 28: plane mirror 29: ⁇ / 2 wave plate 30: polarization beam splitter 31: plane mirror 32: pin photodiode 33: plane mirror 34: pin photodiode 35: differential amplifier 36: zero-cross determination circuit 37 : Electron beam passage 51: Polarized radiation generation system 52: High frequency signal generator 53: High energy electron beam generator 54: Collision chamber 55:

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Lasers (AREA)

Abstract

La présente invention concerne une oscillation laser polarisée capable de guider une lumière laser vers un résonateur optique à trois dimensions afin de résonner à droite ou à gauche, et de faire basculer aisément la polarisation entre la gauche et la droite. L'oscillation laser polarisée consiste : à guider la lumière laser vers un résonateur optique (4) ; à retourner la lumière laser par une paire de miroirs plats (21, 22) et une paire de miroirs concaves (23, 24) disposées spatialement dans le résonateur optique (4), et à appliquer une tension de commande en rampe au résonateur optique (4) afin de déformer un élément piézoélectrique (25), ce qui ajuste une longueur de trajet optique formée par les miroirs plats (21, 22) et les miroirs concaves (23, 24) ; à guider la lumière laser transmise à travers le miroir plat (21) vers un générateur de signaux de rétroaction de passage par zéro (6) afin de déterminer si un passage par zéro pour une polarisation droite et un passage par zéro pour une polarisation gauche ont été générés par une valeur différentielle entre un composant à polarisation P et un composant à polarisation S de la lumière laser ; et à fixer, sur la base d'un résultat de la détermination, une valeur de tension d'une tension de commande appliquée à l'élément piézoélectrique (25) à partir d'un dispositif de commande résonnant (8) et à amener la lumière laser à polarisation droite ou à polarisation gauche à résonner dans le résonateur optique (4).
PCT/JP2010/062749 2009-08-05 2010-07-29 Dispositif de résonance optique à trois dimensions, procédé d’oscillation laser polarisée, et système d’oscillation laser polarisée Ceased WO2011016378A1 (fr)

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CA2807120A CA2807120C (fr) 2009-08-05 2010-07-29 Dispositif de resonance optique a trois dimensions, procede d'oscillation laser polarisee, et systeme d'oscillation laser polarisee

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JP2009-182869 2009-08-05
JP2009-182788 2009-08-05
JP2009182788A JP2011035328A (ja) 2009-08-05 2009-08-05 偏光レーザー発振方法、偏光放射線発生方法及びそのシステム
JP2009182869A JP2011034006A (ja) 2009-08-05 2009-08-05 ３次元光共振器

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
WO2014118998A1 (fr) * 2013-02-01 2014-08-07 Inter-University Research Institute Corporation High Energy Accelerator Research Organization Résonateur optique bidimensionnel à 4 miroirs
WO2014118999A1 (fr) * 2013-02-01 2014-08-07 Inter-University Research Institute Corporation High Energy Accelerator Research Organization Générateur de laser par rafale utilisant un résonateur optique
WO2015087944A1 (fr) * 2013-12-11 2015-06-18 Inter-University Research Institute Corporation High Energy Accelerator Research Organization Résonateur optique

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JPH0495747A (ja) * 1990-08-08 1992-03-27 Sony Corp リタデーション測定装置
US6038055A (en) * 1997-11-13 2000-03-14 Max-Planck-Gesellschaft Zur Forderung Der Wissenschaften E.V. Method and device for generating phase-coherent light pulses
JP2005150252A (ja) * 2003-11-12 2005-06-09 Cyber Laser Kk 第５高調波発生装置

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Publication number Priority date Publication date Assignee Title
JPH0495747A (ja) * 1990-08-08 1992-03-27 Sony Corp リタデーション測定装置
US6038055A (en) * 1997-11-13 2000-03-14 Max-Planck-Gesellschaft Zur Forderung Der Wissenschaften E.V. Method and device for generating phase-coherent light pulses
JP2005150252A (ja) * 2003-11-12 2005-06-09 Cyber Laser Kk 第５高調波発生装置

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014118998A1 (fr) * 2013-02-01 2014-08-07 Inter-University Research Institute Corporation High Energy Accelerator Research Organization Résonateur optique bidimensionnel à 4 miroirs
WO2014118999A1 (fr) * 2013-02-01 2014-08-07 Inter-University Research Institute Corporation High Energy Accelerator Research Organization Générateur de laser par rafale utilisant un résonateur optique
JP2016507156A (ja) * 2013-02-01 2016-03-07 大学共同利用機関法人 高エネルギー加速器研究機構 ２次元４鏡光共振器
US9769913B2 (en) 2013-02-01 2017-09-19 Inter-University Research Institute Corporation High Energy Accelerator Research Organization Burst-laser generator using an optical resonator
WO2015087944A1 (fr) * 2013-12-11 2015-06-18 Inter-University Research Institute Corporation High Energy Accelerator Research Organization Résonateur optique
JP2017502501A (ja) * 2013-12-11 2017-01-19 大学共同利用機関法人 高エネルギー加速器研究機構 光共振器
EP3080880A4 (fr) * 2013-12-11 2017-11-08 Inter-University Research Institute Corporation High Energy Accelerator Research Organization Résonateur optique
US9832851B2 (en) 2013-12-11 2017-11-28 Inter-University Research Corporation High Energy Accelerator Research Organization Optical resonator

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