RU98121607A - SOFT IRIS FOR LASERS - Google Patents

Claims (1)

1. Soft diaphragm for lasers based on a cell with two windows. hermetically connected to each other by a spacer ring with holes and forming a housing, comprising an insert of an optically transparent material with a refractive index n _B , placed between windows with two gaps. filled through holes with a liquid absorbing radiation with a wavelength λ from a laser beam incident on the cell, and the thickness of at least one of the gaps filled with liquid increases as a function of the radius of the cell r from the axis to the periphery, characterized in that the insert is made in the form convex-concave meniscus with spherical or aspherical surfaces, and the gaps are filled independently by various liquids, moreover, a laser absorbing liquid with a refractive index

only the gap between one of the cuvette windows and the convex meniscus surface is filled, and the second gap is filled with a liquid with a refractive index transparent to laser radiation

in this case, the mismatch Δn ₁ and Δn _{2 of} the refractive indices of the liner and liquids

are chosen such that the maximum deflection angle of the radiation beam emerging at the periphery of the cell at r = a, Ψ (a) is within the diffraction angle for the aperture of the cell with a diameter of 2a, Ψ (a) <1.22λ / 2a.
2. The soft diaphragm for lasers according to claim 1, characterized in that the absorbing liquid in the gap of the cell is a phototropic medium, for example. a solution of a bleachable dye.