High-frequency-multiplication efficiency green laser producing method

Abstract

The method for producing green laser of double frequency in high efficiency uses pump light source for pumping laser at side by working crystal, and flat-convex short cavity in 'L' or 'V'shape. Flat mirror and convex mirror are as front and back cavity mirrors. Focus of thermal lens produced by laser working module and radius of curvature of the convex mirror are matched to length of cavity. Using Q adjustment produces quasi-continuous fundamental light in high peak power inside cavity so as to generate oscillation in narrow pulse and high power by infrared fundamental light. Finally, using non-linear crystal in double frequency inside cavity generate second harmonic to output green light. The invention makes size of laser medium basic mode maximum so as to be in favor of improving quality of light beam. Short cavity forms narrow laser pulse, and high power of peak value raises efficiency of double frequency. L' or 'V'shaped cavity eliminates two beams of green light outputted.

Description

Technical field [0001] The invention relates to a laser generating method, in particular to a green laser generating method. Background technique [0002] The wavelength of the green laser is smaller than that of the infrared laser, so the focused spot of the green laser is smaller than that of the infrared laser. In addition, the energy of a single photon of the green laser is greater than that of a single photon of the infrared laser, so when interacting with other substances The heat-affected zone of the green laser is smaller. Because the green laser has the advantages of small focus spot and small heat-affected zone, the green laser can be used for fine processing of materials. Compared with invisible lasers (infrared and ultraviolet lasers), green lasers can be directly observed by human eyes, so it is also widely used in laser demonstrations. In addition, green lasers also have many applications in laser medicine, optical storage, information processing, and optical...

AI Technical Summary

Problems solved by technology

The frequency-doubling lasers mentioned above are all linear cavities. In order to form a single-ended green laser output, a lens with high inverse second harmonic light is inserted into the straight cavity. The return of the fundamental wave passes through the frequency doubling crystal harmonic and is reflected by the high anti-second harmonic optical lens in the cavity to generate another green light output, resulting in the phenomenon of outputting two green light beams

Due to the low damage threshold of KTP, long-term intracavity high-power frequency doubling produces "gray trace" phenomenon, which is easy to cause damage

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