FIELD: laser engineering; emission-line narrowing devices built around diffraction grating.
SUBSTANCE: emission-line narrowing device has diffraction grating, master working side of diffraction grating, chamber for accommodating at least mentioned diffraction grating, helium source for blasting mentioned chamber, beam expanding device that functions to expand mentioned laser beams, turning gear for guiding mentioned expanded beam to working side of diffraction grating to select desired wavelength range from mentioned expanded beam. Method for regulating laser frequency dispersion involves guiding of gaseous helium flow to working side of diffraction grating; in the process pressure of blast gas is reduced to cut down optical effects of hot gas layer.
EFFECT: minimized thermal distortions in narrow-line lasers generating high-power and high-repetition-rate beams.
15 cl, 12 dwg
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