Excimer Broadband Pumped Alkali Metal Laser Using Negative Branched Confocal Unstable Cavity Structure

An alkali metal, unstable cavity technology, applied in the field of alkali metal lasers, can solve problems such as low conversion efficiency

Active Publication Date: 2021-06-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Description
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  • Application Information

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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

Method used

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  • Excimer Broadband Pumped Alkali Metal Laser Using Negative Branched Confocal Unstable Cavity Structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] see attached figure 1 As shown, the main structure of the present invention includes: a pumping source 1, a concave reflector a2, a concave reflector b3, an alkali metal vapor pool 4, a heating furnace 5, and a plane high reflector 6.

Embodiment 2

[0023] see attached figure 1 As shown, the main structure of the present invention includes: a pumping source 1, a concave reflector a2, a concave reflector b3, an alkali metal vapor pool 4, a heating furnace 5, and a plane high reflector 6.

[0024] The specific implementation method is:

[0025] The alkali metal steam pool 4 is filled with a sufficient amount of cesium metal, while the alkali metal steam pool 4 is also filled with krypton gas as a buffer gas. Heated to 300°C, the pressure of the cesium vapor at this temperature is 2.31torr; the outer surfaces of the windows at both ends of the alkali metal vapor pool 4 are coated with an anti-reflection film in the 800-900nm band; the output laser wavelength of the pump source is 841nm, corresponding to cesium and The blue wing absorption peak center wavelength of the excimer (Cs-Kr) formed by krypton, the outer diameter of the annular laser spot output by the pump source A=45.0mm, the inner diameter B=40.9mm, the cross-sec...

Embodiment 3

[0027] see attached figure 1 As shown, the main structure of the present invention includes: a pumping source 1, a concave reflector a2, a concave reflector b3, an alkali metal vapor pool 4, a heating furnace 5, and a plane high reflector 6.

[0028] The specific implementation method is:

[0029] The alkali metal steam pool 4 is filled with a sufficient amount of rubidium metal, while the alkali metal steam pool 4 is also filled with krypton gas as a buffer gas. Heating to 280°C, the pressure of the rubidium vapor at this temperature is 0.78torr; the outer surfaces of the windows at both ends of the alkali metal vapor pool 4 are coated with anti-reflection coatings in the 730-830nm band; the output laser wavelength of the pump source is 760nm, corresponding to rubidium and The blue wing absorption peak center wavelength of the excimer (Rb-Kr) formed by krypton, the outer diameter of the annular laser spot output by the pump source A = 45.0mm, the inner diameter B = 42.5mm, t...

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Abstract

The invention discloses an excimer broadband pumped alkali metal laser adopting a negative confocal unstable cavity structure, including a pump source, a concave reflector a, a concave reflector b, an alkali metal vapor pool, a heating furnace, and a plane height mirror. The alkali metal laser is suitable for using alkali metals such as sodium, potassium, rubidium, and cesium as the gain medium, and using the negative bi-concave confocal unstable cavity formed by the concave mirror a and the concave mirror b to make the pumping of the ring spot In the unstable cavity, the light is shrunk and reflected multiple times according to the magnification of the unstable cavity, so that the pump light is evenly distributed in the alkali metal vapor pool, realizing repeated pumping, and increasing the interaction between the excimer and the pump light. The length of action can greatly increase the absorption and utilization of pump light by excimers and improve the conversion efficiency. The method can make full use of the pumping light under the condition that the laser cavity length is constant, and is easy to realize; the excimer broadband pumping alkali metal laser can be applied in the field of high-energy laser through the method.

Description

technical field [0001] The invention relates to the technical field of alkali metal lasers, in particular to a new method for improving the conversion efficiency of alkali metal lasers by designing a negative branch confocal unstable cavity structure. Background technique [0002] Excimer broadband pumped alkali metal laser (Excimer pumped alkali laser, XPAL) uses the excimer formed by alkali metal and inert gas (or alkane gas), which can realize broadband absorption of pump light and solve the problem of semiconductor pumped alkali The absorption linewidth of the metal laser (Diode pumped alkaline laser, DPAL) does not match seriously with the emission linewidth of the pump light. In addition, XPAL passes the alkali metal n 2 P 3 / 2 with n 2 P 1 / 2 Relaxation control of energy levels, enabling alkali metal D 1 line laser output, or to achieve alkali metal D 2 Line laser output, therefore, has received extensive attention in the field of high-energy lasers. [0003] Sin...

Claims

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Application Information

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Patent Type & Authority Patents(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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