FIELD: quantum electronics. SUBSTANCE: selector has a plane-parallel of crystalline quartz disposed on the resonator axis at a Brewster angle and rotatable relative to the normal to the surface. The selector is characterized in that angle β between the direction on the plate optic axis and its surface within the range of 45-50 degrees provides an increased thickness of plate according to expression h:r=λ{[n2-sin2(arctg n0)]1/2- [n2-sin2(arctg n0)]1/2}-1 given in invention description, where λ is radiation wave length in the center of tuning range, n and n0 refraction indices for extraordinary and ordinary waves to the thickness of 1 mm. EFFECT: simplified manufacture, improved optic quality, enhanced stabilization of laser modes with maximum laser line width. 3 dwg
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