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Excimer broadband pumping alkali metal laser by adopting negative-branch confocal unstable-cavity structure

An alkali metal, unstable cavity technology, applied in the field of alkali metal lasers, can solve the problems of low conversion efficiency, achieve good uniformity, improve conversion efficiency, and achieve the effect of repeated pumping

Active Publication Date: 2020-04-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a new method for improving the laser conversion efficiency by using an excimer broadband pumped alkali metal laser with a negative branch confocal unstable cavity structure, which can solve the problems encountered in the development of the high-energy laser field. The problem of low conversion efficiency

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  • Excimer broadband pumping alkali metal laser by adopting negative-branch confocal unstable-cavity structure

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Effect test

Embodiment 1

[0019] See attached for details figure 1 As shown, the main structure of the present invention includes: a pumping source 1, a concave reflector a 2, a concave reflector b 3, an alkali metal vapor pool 4, a heating furnace 5, and a flat high reflector 6.

Embodiment 2

[0023] See attached for details figure 1 As shown, the main structure of the present invention includes: a pumping source 1, a concave reflector a 2, a concave reflector b 3, an alkali metal vapor pool 4, a heating furnace 5, and a flat high reflector 6.

[0024] The specific implementation is:

[0025] The alkali metal vapor pool 4 is filled with sufficient cesium metal, and the alkali metal vapor pool 4 is also filled with krypton gas as a buffer gas. The inflation pressure of the krypton gas at room temperature is 1000 torr, and the alkali metal vapor pool 4 is heated by the heating furnace 5. When heated to 300°C, the pressure of cesium vapor at this temperature is 2.31torr; the outer surface of the windows at both ends of the alkali metal vapor pool 4 is coated with a 800-900nm waveband enhancement film; the pump source output laser wavelength is 841nm, which corresponds to cesium and The blue wing of the excimer formed by krypton (Cs-Kr) absorbs the center wavelength of the ...

Embodiment 3

[0027] See attached for details figure 1 As shown, the main structure of the present invention includes: a pumping source 1, a concave reflector a 2, a concave reflector b 3, an alkali metal vapor pool 4, a heating furnace 5, and a flat high reflector 6.

[0028] The specific implementation is:

[0029] The alkali metal steam pool 4 is filled with a sufficient amount of rubidium metal, and the alkali metal steam pool 4 is also filled with krypton gas as a buffer gas. The inflation pressure of the krypton gas at room temperature is 1400 torr, and the alkali metal steam pool 4 is heated by the heating furnace 5. When heated to 280°C, the pressure of rubidium vapor at this temperature is 0.78torr; the outer surface of the windows at both ends of the alkali metal vapor pool 4 is coated with a 730-830nm waveband enhancement film; the pump source output laser wavelength is 760nm, corresponding to rubidium and The blue wing of the excimer formed by krypton (Rb-Kr) absorbs the center wave...

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Abstract

The invention discloses an excimer broadband pumping alkali metal laser by adopting a negative-branch confocal unstable-cavity structure. The excimer broadband pumping alkali metal laser comprises a pumping source, a concave reflector a, a concave reflector b, an alkali metal steam pool, a heating furnace and a planar high-reflectivity mirror. The alkali metal laser is suitable for taking alkali metals such as sodium, potassium, rubidium and cesium as gain media; a negative-branch biconcave confocal unstable cavity formed by the concave reflector a and the concave reflector b is adopted, so that the pump light of an annular light spot is subjected to multiple times of beam shrinkage and reflection in the unstable cavity according to the amplification factor of the unstable cavity, the pumplight is uniformly distributed in the alkali metal steam pool, repeated pumping is realized, the interaction length between excimers and the pump light is increased, the absorption and utilization ofthe excimers on the pump light can be greatly increased, and the conversion efficiency is improved. According to the invention, the pump light can be fully utilized under the condition that the cavity length of the laser is fixed, and implementation is easy; and through adoption of the method, the excimer broadband pumping alkali metal laser can be applied to the field of a high-energy laser.

Description

Technical field [0001] The invention relates to the technical field of alkali metal lasers, in particular to a new method for designing a negative branch confocal unstable cavity structure to improve the conversion efficiency of alkali metal lasers. Background technique [0002] Excimer pumped alkali laser (Excimer pumped alkali laser, XPAL) uses the excimer formed by alkali metal and inert gas (or alkane gas) to achieve broadband absorption of pump light, which solves the problem of semiconductor pumping alkali There is a serious mismatch between the absorption linewidth of the metal laser (Diode pumped alkali laser, DPAL) and the emission linewidth of the pump light. In addition, XPAL adopts 2 P 3 / 2 With n 2 P 1 / 2 Relaxation control of energy level can realize alkali metal D 1 Line laser output, or realize alkali metal D 2 Line laser output, therefore, has received extensive attention in the field of high-energy lasers. [0003] Because the van der Waals clusters formed by alkal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/03H01S3/08
CPCH01S3/031H01S3/08059
Inventor 郭敬为胡墅刘金波盖宝栋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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