Composite wall surface sealed tube cavity used for side surface pumped alkali metal vapor laser

Abstract

The invention discloses a composite wall surface sealed tube cavity used for a side surface pumped alkali metal vapor laser. The composite wall surface sealed tube cavity is characterized by comprising an alkali metal vapor sealed tube cavity side wall and end windows positioned at the two ends of the alkali metal vapor sealed tube cavity side wall; a roughening region, which is used for performing roughening processing, is arranged on the inner wall surface of the alkali metal vapor sealed tube cavity side wall; the outer wall surface of the alkali metal vapor sealed tube cavity side wall is coated with high-reflective films with corresponding pumping wavelengths to form a high-reflective film region; the high-reflective films are corresponding to the roughening region; and a non-film-coated region between adjacent high-reflective films is used as an incident region of semiconductor pumped beams. By adoption of the composite wall surface sealed tube cavity, parasitic oscillation in the vapor cavity can be effectively suppressed, pumped energy loss and corresponding thermal load related therewith can be effectively reduced, and output power of a DPAL system can be improved.

Description

technical field [0001] The invention belongs to the technical field of alkali metal lasers, and relates to a composite wall sealed tube cavity for a side-pumped alkali metal vapor laser. Background technique [0002] Diode Pumped Alkali Vapor Laser (DPAL) has large saturation gain, high theoretical Stokes efficiency and high light-to-light conversion efficiency, simple and compact structure, non-toxic laser medium, easy post-processing, and laser output The line width is narrow, and the output wavelength is within the response band of conventional photodetectors (cesium (Cs): 894.95nm; rubidium (Rb): 794.98nm; potassium (K): 770.11nm). Since most of the heat generated in the laser can be taken away by the flow of the gaseous medium, the thermal effect of the laser can be effectively suppressed. In recent years, the semiconductor laser pumped alkali metal vapor laser has been paid more and more attention by various countries and has been developed rapidly. It has gradually b...

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Problems solved by technology

However, adopting this structure will bring other more serious problems

On the one hand, it will cause part of the pump light reflected back into the vapor tube cavity through the high reflection film to return to the inside of the pump semiconductor laser, which will affect the luminescence characteristics of the semiconductor laser and reduce the luminescence life of the laser; on the other hand , because the saturation gain of the semiconductor laser-pumped alkali metal vapor laser is very large, the plated high-reflection film will generate serious parasitic oscillations inside the vapor tube cavity, which will greatly reduce the conversion efficiency of the semiconductor laser and reduce the output power of DPAL

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