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A Gas Raman Laser Based on Ring Unstable Cavity

A technology of Raman laser and unstable cavity, which is applied in the field of laser, can solve the problems affecting the optical efficiency of the fundamental frequency, and achieve the effects of non-overlapping laser in the cavity, good beam quality, and improved spectral conversion efficiency

Active Publication Date: 2021-12-21
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the intracavity laser oscillation mode of the negative-branched real confocal unstable cavity is single-focus reflection parallel, the parallel light passing through the Raman medium is generally lower than the Raman threshold due to the lower power density, and the net loss through the Raman medium will affect Fundamental frequency light efficiency

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  • A Gas Raman Laser Based on Ring Unstable Cavity
  • A Gas Raman Laser Based on Ring Unstable Cavity
  • A Gas Raman Laser Based on Ring Unstable Cavity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] like figure 1 As shown, a gas Raman laser based on an annular unstable cavity includes a fundamental-frequency laser plane reflector 1, a laser gain medium 2, a fundamental-frequency laser plane reflector 3, and a convex lens 4 coated with a fundamental-frequency optical anti-reflection film, Fundamental frequency laser reflecting Raman light anti-reflection plane mirror 5, Raman cell 6, fundamental frequency laser reflecting Raman light anti-reflection plane mirror 7, convex lens 8 coated with fundamental frequency light anti-reflection film, coated with fundamental frequency light anti-reflection film The Brewster angle window 9 of the film; the intracavity laser passes through the fundamental-frequency laser plane reflector 1, the laser gain medium 2, the fundamental-frequency laser plane reflector 3, and the convex lens coated with the fundamental-frequency anti-reflection film in the clockwise direction 4. A plane mirror 5 for fundamental frequency laser reflection...

Embodiment 2

[0045] like figure 2 As shown, on the basis of Embodiment 1, the gas Raman laser of the annular unstable cavity is inserted outside the cavity along the coaxial Raman optical high reflection mirror 10 of the optical axis on the Raman light transmission path, and the Raman laser The Raman light output coupling mirror 11, the reflection surfaces of the Raman light high reflection mirror 10 and the Raman light output coupling mirror 11 have curvature, and share a center of curvature, and the center of curvature coincides with the focal point in the cavity. The Raman light high reflection mirror 10 and the Raman light output coupling mirror 11 constitute a Raman optical resonant cavity, and the length of the resonant cavity is between the curvature radius of the Raman light high reflection mirror 10 and the Raman light output coupling mirror 11. and. Specifically, when the laser is working, the power density of the fundamental frequency light near the focal point and focal depth...

Embodiment 3

[0047] In Embodiment 1 and Embodiment 2, the laser will propagate clockwise and counterclockwise in the form of traveling waves in the resonator, in which the size of the beam is continuously enlarged as a forward wave, and the other is continuously reduced as a backward wave , the existence of the backward wave will lead to the possible existence of standing waves in the cavity, and the most important thing is that it will generate Raman light, but this part of Raman light cannot be used, which will reduce the Raman conversion efficiency. So, if image 3 As shown, on the basis of Example 2, the Brewster corner window 9 coated with the anti-reflection film of the fundamental frequency light is removed, and the gas Raman laser of the annular unstable cavity has a non-Raman light in the cavity The polarizer 12 coated with the anti-reflection film of the fundamental frequency light, the Faraday rotator 13, the polarizer 14, and the optical rotator 15 are sequentially inserted in ...

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Abstract

The invention provides a gas Raman laser based on an annular unstable cavity, which includes a fundamental-frequency laser plane reflector, a laser gain medium, a fundamental-frequency laser plane reflector, a convex lens coated with a fundamental-frequency optical anti-reflection film, and a fundamental-frequency laser Raman light-reflecting flat mirror, Raman cell, fundamental-frequency laser-reflecting Raman light-reflective flat mirror, convex lens coated with fundamental-frequency light anti-reflection coating. The annular cavity formed by these elements satisfies the self-imaging condition, so that the focal point in the cavity is placed in the center of the Raman cell, which can reduce the light threshold of the Raman laser and improve the conversion efficiency. Outside the cavity, a Raman optical high reflection mirror is inserted coaxially along the optical axis on the Raman optical transmission path, and the Raman optical output coupling mirror constitutes a Raman optical resonant cavity, which can achieve lower threshold and better beam quality . By inserting a one-way device coaxial with the optical axis at a suitable position in the cavity, and inserting an etalon, the space hole burning caused by the standing wave can be avoided, and the fundamental frequency light with stable frequency can be realized to improve the spectral conversion efficiency of the Raman laser.

Description

technical field [0001] The invention belongs to the field of lasers, and in particular relates to an annular unstable cavity gas Raman laser for generating frequency-converted Raman laser. Background technique [0002] Stimulated Raman scattering technology of Raman active medium is an important technical means to realize laser frequency conversion. The inherent properties of gas lasers determine its characteristics of high power, high beam quality, high beam uniformity, and high damage threshold. Raman lasers with gas as the gain medium have the same excellent laser characteristics. Compared with other types of Raman laser media, gas Raman media can achieve large Raman frequency shift and narrow Raman linewidth. Commonly used Raman media are N 2 、H 2 、CH 4 etc. Since the gas concentration is generally not high, a higher pump power density is required to reach the threshold. [0003] At present, there are several methods for realizing Raman laser using gas medium: the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/08H01S3/083H01S3/10H01S3/11H01S3/30
CPCH01S3/0835H01S3/08081H01S3/10023H01S3/11H01S3/305
Inventor 王颜超郭敬为刘万发王鹏远陈莹
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI