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WO2009037031A1 - Dispositif laser et son procédé de fonctionnement - Google Patents

Dispositif laser et son procédé de fonctionnement Download PDF

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Publication number
WO2009037031A1
WO2009037031A1 PCT/EP2008/059580 EP2008059580W WO2009037031A1 WO 2009037031 A1 WO2009037031 A1 WO 2009037031A1 EP 2008059580 W EP2008059580 W EP 2008059580W WO 2009037031 A1 WO2009037031 A1 WO 2009037031A1
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WO
WIPO (PCT)
Prior art keywords
laser
region
laser device
active
passive
Prior art date
Application number
PCT/EP2008/059580
Other languages
German (de)
English (en)
Inventor
Heiko Ridderbusch
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2009037031A1 publication Critical patent/WO2009037031A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P23/00—Other ignition
    • F02P23/04—Other physical ignition means, e.g. using laser rays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094096—Multi-wavelength pumping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10038—Amplitude control
    • H01S3/10046—Pulse repetition rate control
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
    • H01S3/1022—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
    • H01S3/1024—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping for pulse generation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/1601—Solid materials characterised by an active (lasing) ion
    • H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
    • H01S3/1611—Solid materials characterised by an active (lasing) ion rare earth neodymium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/1601—Solid materials characterised by an active (lasing) ion
    • H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
    • H01S3/1618—Solid materials characterised by an active (lasing) ion rare earth ytterbium

Definitions

  • the invention relates to a laser device having at least one passive laser circuit having laser-active solid.
  • the invention further relates to an operating method for a laser device of the aforementioned type in which pumping light is applied to the laser device in order to generate a laser pulse.
  • Such laser devices and operating methods are known and have, for example, a neodymium (Nd) -doped laser material.
  • the neodymium-doped laser material has the disadvantage of a relatively low fluorescence lifetime, so that the storage of energy supplied by pumping light is very limited.
  • laser devices with ytterbium (Yb) -doped laser material are known. These laser materials, in cooperation with a passively Q-switched laser system, have the disadvantage that relatively high pumping light intensities are required to emit a laser pulse after a desired period of time.
  • the laser-active solid has at least a first region and a second region, wherein the first region has a first cross section for the stimulated emission, which is different from a second cross section for the stimulated emission of the second area. That is, according to the invention, the probability that stimulated emission of photons occurs in the first region of the laser active material is different from a corresponding probability for the second region of the laser active material.
  • This deliberately induced asymmetry with regard to the cross section for the stimulated emission is advantageously exploited to store in the laser active region, which has a lower cross section for the stimulated emission, for example in the first region, a relatively large amount of energy, which is the first region in Form of a pump light is supplied. Since the laser-active material of the first region according to the invention has a relatively low cross section for the stimulated emission, the energy of a corresponding inversion density irradiated via the pump light can be stored without a saturable absorber of the passive Q-switching already fading thereby initiating the laser operation.
  • the laser-active material of the second region has a relatively large stimulated emission cross section, so that in contrast to the first region, stimulated emission is more likely to occur upon application of pump light. Accordingly, by the optical pumping of the second laser-active region, the laser operation in the laser device according to the invention can be triggered as it were, and as soon as the saturable absorber of the passive Q-circuit is faded, finally, the energy stored in the first region, which corresponds to a correspondingly high inversion density , degrade in the form of a laser pulse.
  • the first region has an ytterbium-doped host material, while the second region has a neodymium-doped host material.
  • the first region may have an ytterbium doping of up to 20 atomic percent
  • the second region may have a neodymium doping of up to 2.5 atomic percent.
  • At least one non-laser-active, in particular undoped, region which on the one hand is used for mechanical spacing, e.g. the sensitive coupling mirror and output mirror of the laser device of areas with laser-active material is used, which heats up accordingly when exposed to pump light.
  • the sensitive coupling mirror and output mirror of the laser device of areas with laser-active material is used, which heats up accordingly when exposed to pump light.
  • the provision of undoped regions according to the invention enables a further degree of freedom in the geometric design of the laser device according to the invention, which is reflected in FIG known manner also affects the pulse duration of the laser pulses generated.
  • the laser device can advantageously be monolithic, that is, all the laser-active regions and optionally the passive Q-switching and the undoped regions are integrally formed.
  • the laser device according to the invention may also have a plurality of discrete components.
  • a saturable absorber of the passive Q-switching is arranged between different laser-active regions and / or between a laser-active region and an undoped region.
  • This variant of the invention advantageously enables an individual direct irradiation of pump light into the respective laser-active region and a temporary optical separation of the regions from one another by the Q-switching. That is, the pumping light provided for a first area does not first have to pass through another area before it can act on the first area.
  • an operating method according to claim 9 is given.
  • the method according to the invention provides that a first region of the laser-active solid, which has a first cross-section for the stimulated emission, is optically pumped before a second region of the laser-active solid, which has a second cross-section for the stimulated emission, wherein the second cross-section is greater than the first cross-section, which at the same time an efficient storage of energy in the first region and a temporally flexible generation of a laser pulse is made possible.
  • a first pump start time which defines the start of a pumping operation of the first area, is preferably before a second pump start time, which defines the beginning of a pumping operation of the second area, so that a particularly high amount of energy can be supplied to the laser device according to the invention by the pumping operation of the first area. before the generation of the laser pulse is finally triggered by the pumping of the second region.
  • the time interval between the first pump start time and the second pump start time and / or further parameters of the pumping process in question, in particular an intensity and / or a temporal course of the pump light used can be selected such that the passive one Q-switching due to the pumping of the first area does not already undergo a significant change in their transmission properties, in particular does not allow a laser operation in the laser device.
  • pump light of different wavelengths can be used to optically pump the various laser active regions efficiently.
  • the laser device according to the invention can advantageously be used for the construction of a laser-based ignition device for an internal combustion engine of a motor vehicle or a stationary motor, or generally for all other applications in which laser pulses with high pulse energy must be provided temporally flexible.
  • FIG. 1 shows a first embodiment of the laser device according to the invention
  • FIG. 2a to 2c show a time course of different operating variables of the laser device according to the invention according to FIG. 1, FIG.
  • FIGS. 3a to 3c show different variants of a second embodiment of the laser device according to the invention
  • FIG. 5 shows an ignition device for an internal combustion engine with the invention
  • FIG. 1 schematically shows a first embodiment of the laser device 26 according to the invention.
  • the laser device 26 has a laser-active solid 44, which is also designated as a Q-switch passive Q-switching 46 is optically downstream.
  • the laser-active solid 44 forms here, together with the passive Q-switching circuit 46 and the coupling mirror 42 arranged on the left thereof in Figure 1 and the Auskoppelapt 48, a laser oscillator whose oscillatory behavior depends on the passive Q-switching 46 and thus at least indirectly controllable in a conventional manner is.
  • the laser device according to the invention or the laser-active solid 44 is acted upon by the coupling mirror 42 with pumping light 60a, 60b which is generated in a remotely located pumping light source 30 (FIG. 5) and by the optical waveguide device 28 to the laser device 26 is transmitted.
  • the pumping light 60a, 60b excites electrons in the laser-active solid 44 and thus leads to a known population inversion.
  • the coupling mirror 42 has a relatively large transmission coefficient for the pumping light 60a, 60b.
  • the passive Q-switching circuit 46 While the passive Q-switching circuit 46 has its basic state in which it has a relatively low transmission coefficient, laser operation is avoided in the laser-active solid 44 or in the solid 44, 46 bounded by the coupling-in mirror 42 and the output mirror 48. However, as the pumping time increases, that is to say during continued application of the pumping light 60a, 60b, the radiation intensity in the laser oscillator 42, 44, 46, 48 also increases, so that the passive Q-switching circuit 46 finally fades. That is, its transmission coefficient increases, and laser operation in the laser oscillator 42, 44, 46, 48 begins.
  • the laser pulse 24 is then decoupled from the laser oscillator 42, 44, 46, 48 by the outcoupling mirror 48 arranged on the right in FIG. 1 and is for example used in a laser-based ignition device 27 (FIG. 5) for an internal combustion engine 10 for igniting a combustion chamber 14 the internal combustion engine 10 located air / fuel mixture usable.
  • the laser pulse 24 can be coupled into the combustion chamber 14 of the internal combustion engine 10, for example, by a corresponding optical fiber device or directly by a combustion chamber window arranged downstream of the output mirror 48.
  • a focusing optics for focusing the laser pulse 24 on an ignition point may possibly also be present, in particular also integrally formed with the combustion chamber window.
  • the laser-active solid 44 of the laser device 26 has at least two regions 44a, 44b of laser-active material which have mutually different cross-sections ⁇ a, ⁇ b for the stimulated emission. That is to say, the probability that stimulated emission of photons occurs, for example when exposed to the pump light 60a, 60b, is different from a corresponding probability for the second region in the first region 44a, given otherwise identical boundary conditions such as pump light intensity, etc. 44b.
  • This particular difference of the regions 44a, 44b is used according to the invention to store in the first region 44a pumping energy in the form of a correspondingly high inversion density, the pumping energy being supplied to the region 44a in the form of the first pumping light 60a. Since the laser-active material of the first region 44a according to the invention has a relatively small cross-section ⁇ a for the stimulated emission, relatively much energy can be stored in the region 44a in this way without a saturable absorber of the passive Q-switching circuit 46 already fading thereby prematurely Laser operation initiates.
  • the laser-active material of the second region 44b has a relatively large effective cross-section ⁇ b> ⁇ a for the stimulated emission, so that, in contrast to the first region 44a, a stimulated emission is more likely to occur when the second region 44b is exposed to the second pump light 60b ,
  • the above-described combination of the laser materials used according to the invention for the two areas 44a, 44b advantageously makes it possible to store energy supplied by pumping light 60a in the first area 44a, while by acting on the second area 44b with pumping light 60b a short-term, targeted Bleaching of the saturable absorber of the passive Q-switching 46 is possible.
  • the application of pumping light 60b to the second region 44b is used according to the invention to specify the time of onset of the laser operation and thus the generation of the laser pulse 24.
  • the optical pumping of the second region 44b thus serves as a kind of "trigger" for the laser operation.
  • a first laser pulse first arises.
  • the inversion density built up to that point in the first region 44a can subsequently be reduced, which takes place in the form of a second laser pulse.
  • the time interval of the two laser pulses is comparatively small and is for example in the range of microseconds or less.
  • the first laser pulse generated by the second region 44b has a comparatively low pulse energy, while the laser pulse generated by the first region 44a has a comparatively high pulse energy.
  • FIGS. 2a, 2b, 2c illustrate the operating method according to the invention described above.
  • FIG. 2 a shows the time profile of the transmission coefficient T of the saturable absorber contained in the passive Q-switching circuit 46 (FIG. 1).
  • the optical pumping of the laser-active material of the first region 44a begins first with the pump light 60a provided for this purpose (FIG. 1).
  • FIG. 1 A corresponding increase in the inversion density Na in the region 44a can also be seen from FIG. 2c.
  • optical pumping of the laser-active material of the second region 44b begins with the pumping light 60b (FIG. 1) provided for this purpose at the second pump start time t ⁇ 'according to FIG. A corresponding increase in the inversion density Nb in the region 44b can be seen from FIG. 2b.
  • the transmission coefficient T maintains its output value TO until approximately the time t1. From the time t1, the intensity of the stimulated emitted radiation in the second region 44b is sufficiently large to cause the saturable absorber to fade and thus increase the transmission coefficient T (FIG. 2a), so that the inversion density Nb degrades as shown in FIG. 2b which results in the generation of the first laser pulse 24 1 at time t2.
  • the inversion density Na which has since been built up in the first region 44a, can also be reduced, which leads to the generation of the second laser pulse 24 2 at the time t3.
  • the time interval between the first pump start time t ⁇ and the second pump start time t ⁇ 'and / or further parameters of the relevant pumping operation in particular an intensity and / or generally a time profile of the pumping light 60a used, 60b, chosen such that the passive Q-switching 46 does not already undergo a significant change in its transmission properties as a result of the pumping of the first region 44a, in particular does not permit laser operation in the laser device 26, so that a maximum amount of energy can be stored in the first region 44a, before the corresponding laser pulse 24 2 ( Figure 2c) is generated.
  • FIG. 3 a shows an embodiment comparable to the laser device 26 already illustrated in FIG.
  • the laser-active material of the first region 44a is an ytterbium-doped host material, while the second region 44b is a neodymium-doped host material.
  • the ytterbium doping of the first region 44a can advantageously be up to 20 atomic percent, while the second region 44b has a neodymium doping of up to 2.5 atomic percent.
  • FIG. 3b An alternative embodiment of the laser device 26 according to the invention is shown in FIG. 3b.
  • the laser device 26 shown in FIG. 3b has a different sequence of the regions 44a, 44b.
  • the second region 44b is now arranged directly downstream of the coupling-in mirror 42, and the second region 44b is followed, according to FIG. 3b, by the first region 44a.
  • FIG. 3c Another very advantageous variant of the invention is illustrated in FIG. 3c.
  • the passive Q-switching 46 is located between the regions 44a, 44b.
  • This configuration advantageously makes it possible for the pump light 60a, 60b provided for the respective region 44a, 44b to be irradiated longitudinally, in particular on opposite end sides of the laser device 26, such that the respective region 44a, 44b is directly illuminated by the pumping light 60a, 60b associated therewith can be applied.
  • a corresponding pumping light supply is symbolized in Figure 3c by the arrows 60a, 60b.
  • generated laser pulses can be coupled out either to the right or to the left depending on the design of the mirrors 42, 48.
  • the mirror in question must be designed to be partially reflective of the wavelength of the laser pulses.
  • FIG. 4a shows a further advantageous embodiment of the laser device 26 according to the invention, in which, in addition to the regions 44a, 44b of laser-active material, an undoped region 50a is also provided, which accordingly is not laser-active.
  • the insertion of such an undoped region 50a into the laser device 26 according to the invention advantageously provides, firstly, a degree of freedom with regard to the geometric length of the device 26 to be achieved.
  • the pulse duration of the generated laser pulses 24 1, 24 2 is directly associated with this in a manner known to those skilled in the art.
  • a further advantage of the undoped region 50a between the coupling-in mirror 42 and the second region 44b is that the region 44b which heats up under the influence of pumping light 60b is spaced from the coupling-in mirror 42 by the thickness of the undoped region 50a, for example as a thin dielectric layer is formed and, accordingly, is sensitive to high temperatures.
  • the undoped region 50a may advantageously be arranged such that it effects an at least partial thermal decoupling or an influencing of the heat conditions in the laser device 26.
  • FIG. 4b shows a further advantageous variant of the laser device 26 according to the invention, in which two undoped regions 50a, 50b are provided in such a way that they are optically arranged upstream and downstream of the second laser-active region 44b.
  • FIG. 4 c shows a further variant of the invention, in which a total of three undoped regions 50 a, 50 b, 50 c are provided.
  • a saturable absorber provided in the passive Q-switching circuit 46 of the laser device 26 according to the invention can comprise, for example, Cr 4+ or V 3+ -doped garnets such as YAG, GGG, GSGG, LuAG, YSGG and have an initial transmission TO (FIG is less than 5%, and less than 99.5%.
  • the coupling-in mirror 42 has, for example, antireflection coatings for the wavelengths around 808 nm and around 940 nm, so that the corresponding pump light 60a, 60b can be coupled into the laser device 26.
  • the coupling-in mirror 42 further comprises highly reflective coatings for the wavelengths around 1030 nm and around 1064 nm.
  • the outcoupling mirror 48 can advantageously have, for example, dielectric layers with a partial reflectivity of around 1030 nm and around 1064 nm of from approximately 20% to approximately 99%.
  • the output mirror 48 is further preferably highly reflective for wavelengths of about i nm and about 940 nm. According to the invention, such a configuration is advantageously optically pumped with pumping light 60a, 60b of the wavelengths around 808 nm and around 940 nm. As already described above, it is not necessary for the realization of the principle according to the invention that a pump start time t ⁇ , t ⁇ 'of the two pumping light wavelengths coincide ,
  • the associated coupling-in mirror 42 is to be provided with an antireflection layer of approximately 885 nm in order to enable coupling of the pumping light 60b into the laser device 26.
  • the output mirror 48 optionally has a highly reflective layer for about 885 nm in the present configuration.
  • the invention it is also conceivable to integrate a plurality of saturable absorbers (not shown) into the laser device 26 in order to realize the functionality of the passive Q-switch 46.
  • the saturable absorbers may be provided at different locations of the laser device 26, the aggregate initial transmission TO again corresponding to the initial transmission specified above by way of example.
  • FIG. 5 schematically shows an ignition device 27 for an internal combustion engine 10, in which the laser device 26 according to the invention and the operating method according to the invention described above are used to generate laser pulses 24 which serve to ignite an air / fuel mixture located in the combustion chamber 14 of the internal combustion engine 10.
  • the internal combustion engine 10 comprises a plurality of cylinders, of which only one is designated by the reference numeral 12 in FIG.
  • a combustion chamber 14 of the cylinder 12 is limited by a piston 16.
  • Fuel enters the combustion chamber 14 directly through an injector 18, which is connected to a designated also as a rail or common rail fuel pressure accumulator 20.
  • injected fuel 22 is ignited by means of the above-described high-energy laser pulse 24 and 24 2, which is radiated from the laser device 26 of the ignition device 27 according to the invention in the combustion chamber 14, see. also Figure 2c.
  • the laser device 26 is fed via an optical waveguide device 28 with the pumping light 60a, 60b (FIG. 1) of different wavelengths, which is provided by the pumping light source 30.
  • the pump light source 30 is controlled by a control and regulating device 32, which also controls the injector 18.
  • the pumping light source 30 may comprise one or more semiconductor diodes (not shown), which output pumping light 60a, 60b of corresponding intensity to the laser device 26 via the optical waveguide device 28 as a function of a control current.
  • semiconductor laser diodes and other small-sized pump light sources are preferably used for use in the automotive field, any type of pump light source is principally usable for the operation of the ignition device 27 according to the invention.
  • the laser device 26 can advantageously be used to construct a laser-based ignition device 27 for an internal combustion engine of a motor vehicle or a stationary engine / large gas engine, or generally for all other applications in which laser pulses 24 2 must be provided flexibly in time with high pulse energy.
  • the materials for the laser-active regions 44a, 44b are selected such that their cross-sections ⁇ a, ⁇ b for the stimulated emission differ significantly, in particular by up to one order of magnitude.
  • the laser material having the smaller stimulated emission cross section has i.d.R. a correspondingly large fluorescence lifetime and vice versa. Accordingly, the laser material having the smaller stimulated emission cross section can be ideally used as the energy storage which enables the generation of high pulse energy laser pulses 24 2.
  • the laser pulses 24 2 are preferably used as ignition pulses.
  • the laser material which has the larger cross section for the stimulated emission is advantageously used as a trigger for initiating the laser operation as described, since it can cause almost instantaneously required for laser operation state change of the passive Q-switching with appropriate Pumplichtbeetzschlagung.
  • vanadates such as, for example, is also possible.
  • YVO, GdVO and other host materials possible.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lasers (AREA)

Abstract

La présente invention concerne un dispositif laser (26) comprenant au moins un corps solide (44) à action laser à déclenchement passif (46). Selon l'invention, le corps solide (44) à action laser présente au moins une première zone (44a) et une deuxième zone (44b), la première zone (44a) présentant une première section active (σa)destinée à l'émission stimulée, qui est différente d'une deuxième section active (σb) destinée à l'émission stimulée de la deuxième zone (44b).
PCT/EP2008/059580 2007-09-14 2008-07-22 Dispositif laser et son procédé de fonctionnement WO2009037031A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007044009.1 2007-09-14
DE200710044009 DE102007044009A1 (de) 2007-09-14 2007-09-14 Lasereinrichtung und Betriebsverfahren hierfür

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WO2009037031A1 true WO2009037031A1 (fr) 2009-03-26

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Publication number Priority date Publication date Assignee Title
DE102009028337A1 (de) * 2009-08-07 2011-02-10 Robert Bosch Gmbh Laserzündeinrichtung und Betriebsverfahren hierfür
DE102009029652B4 (de) 2009-09-22 2013-02-21 Robert Bosch Gmbh Lasereinrichtung
DE102010008170A1 (de) * 2010-02-16 2011-08-18 Du, Keming, Dr., 52078 Optische Oszillator/Verstärker-Anordnungen

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US20040218652A1 (en) * 2003-05-01 2004-11-04 Raytheon Company Eye-safe solid state laser system and method
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WO2006125685A1 (fr) * 2005-05-27 2006-11-30 Robert Bosch Gmbh Dispositif d'allumage pour moteur a combustion interne

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WILSON A L ET AL: "Pump-induced bleaching of the saturable absorber in short-pulse Nd:YAG/Cr<4+>:YAG passively Q-switched microchip lasers", IEEE JOURNAL OF QUANTUM ELECTRONICS, IEEE SERVICE CENTER, PISCATAWAY, NJ, USA, vol. 39, no. 12, 1 December 2003 (2003-12-01), pages 1588 - 1593, XP011104364, ISSN: 0018-9197 *

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