High-efficiency hydrogen fluoride laser grating unstable resonator

Abstract

The invention relates to a high-efficiency hydrogen fluoride laser grating unstable resonator. The resonator is an annular chamber and comprises a convex-surface reflecting mirror, a concave-surface reflecting mirror, a film polaroid, a quarter wave plate, a half wave plate, plane total reflecting mirrors, a blazed grating, and a scraper mirror etc. Through change of the polarization characteristic of the oscillation light in the resonator, spherical waves in the resonator are changed into plane waves and reflected to the blazed grating, the aberration of the grating caused by diverging spherical waves of the conventional unstable resonator is reduced, the efficiency of the first-order diffracted light of the blazed grating is improved, and high-efficiency output of hydrogen fluoride single-spectral-line laser is realized.

Description

Technical field [0001] The invention belongs to the field of chemical lasers, and specifically relates to a high-efficiency hydrogen fluoride laser grating unstable cavity. Background technique [0002] Hydrogen fluoride laser has rich output spectrum, high energy conversion efficiency, and good engineering amplification. It is the laser with the highest output power used so far. Hydrogen fluoride lasers are usually multi-line operation, and in practical applications, certain specific wavelength single-line lasers are often required. In this case, the laser line selection output becomes very necessary. There are many methods suitable for laser line selection. Diffraction gratings, prisms, and intracavity absorption cells can all be used, but from the perspective of high-power lasers, diffraction gratings are more attractive. Blazed grating has good directional diffraction ability. Using blazed grating as a resonant cavity composed of cavity mirrors is a common method in line sel...

AI Technical Summary

Problems solved by technology

However, in an unstable cavity, what is incident on the grating is a divergent spherical wave. For off-axis light, the first-order diffracted light on the grating cannot be reflected like a flat mirror, resulting in aberrations that affect the diffraction efficiency of the grating.

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