Laser splitting method for preventing crystals from being damaged

Abstract

The invention provides a laser splitting method for preventing crystals from being damaged. The laser splitting method for preventing the crystals from being damaged includes the following steps: the nonlinear frequency conversion of first fundamental lasers and second fundamental lasers is carried out in the nonlinear optical crystals under the condition that phase matching is met and conversion lasers are generated. Before complete reflection occurs on the inner surface of the nonlinear optical crystals, the conversion lasers, the remaining first fundamental lasers and the remaining second fundamental lasers are mutually parallel or similarly parallel and transmitted in space in a mutual overlapping mode. After the complete reflection occurs on the inner surface of the nonlinear optical crystals, certain included angles exist mutually among the conversion lasers, the remaining first fundamental lasers and the remaining second fundamental lasers and the conversion lasers, the remaining first fundamental lasers and the remaining second fundamental lasers exit in the space in a mutual splitting mode. According to the laser splitting method for preventing the crystals from being damaged, the power density of exitance surfaces of the nonlinear optical crystals is decreased, the nonlinear optical crystals are protected from being damaged and meanwhile the output of pure frequency conversion lasers is obtained.

Description

technical field [0001] The invention relates to the field of nonlinear optics, in particular to a laser light splitting method for preventing crystal damage. Background technique [0002] Different fields require lasers of different wavelengths, such as 560nm lasers for laser biological microscopes, 532nm lasers for laser ranging, 400nm lasers for laser direct plate printing, and 355nm or even shorter wavelength lasers for industrial microprocessing. The laser wavelength that can be directly output by the laser is very limited, and the existing technology often uses the method of nonlinear frequency conversion to convert and expand the laser frequency. [0003] Let the frequency of the first beam be ω 1 , the frequency of the second beam of light is ω 2 , using the birefringence of the nonlinear crystal to compensate the dispersion of the refractive index, the phase matching condition ω can be satisfied 1 no 1 +ω 2 no 2 =ω 3 no 3 , the obtained frequency is ω 3 lase...

AI Technical Summary

Problems solved by technology

The disadvantage is that the three beams of light overlap each other on the exit surface, and the power density is very high. Working for a long time will cause the exit surface to be damaged or even burst

Images