Laser out-of-cavity frequency doubling system

Abstract

The invention provides a laser out-of-cavity frequency doubling system, which comprises a frequency doubling crystal (1), a matching lens (2), a first wave plate (3), a dichroic sheet (4), a second wave plate (5), a polarization beam splitter (6) and a frequency quadruple crystal (8) sequentially arranged along a light path transmission direction, and a frequency quadruple garbage light collector (9) for collecting garbage beams reflected by the polarization beam splitter (6). The laser out-of-cavity frequency doubling system has the advantages that the stability is greatly improved, pollutants are reduced, removed newly-added pollutants are controlled, the service life of the whole machine is prolonged, output of non-coaxial reflected light is eliminated, the light beam quality of ultraviolet laser is improved, and damage to devices is reduced.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a laser external cavity frequency doubling system. Background technique [0002] End-pumped UV lasers are widely used in industry, medical, military, aerospace, scientific research and other fields due to their short wavelength, small spot size, and high peak power. Since both laser crystals and frequency conversion crystals have a certain damage threshold, especially ultraviolet frequency conversion crystals are easily damaged by ultraviolet light, laser crystals are easily damaged during use; the area of ​​crystals damaged by ultraviolet beams only accounts for the crystal cross-sectional area However, it is still necessary to repair the laser or replace the crystal, which causes a lot of waste of manpower and material resources, makes the overall service life of the ultraviolet laser short, and cannot meet the requirements of long-term stable operation. [0003] se...

AI Technical Summary

Problems solved by technology

Anti-reflection coating on the quadruple frequency crystal 8 will shorten its service life, and if it is not coated, there will be reflected 266nm laser light, the single photon energy is large, and there are even photoelectric excitation effects and optical tweezers effects, which will damage the front devices. And there is non-coaxial stray light output; when using figure 2 When using the optical path system (quadruple frequency without coating 8), it is found that the dichroic film 4 is the fastest damaged device. Color chip 4 is still the device with the shortest life

And junk light is still uncertainly excited pollutants

If a device in the original optical path is plated with a 266nm reflective film system before quadruple frequency, the reflected light is easy to hit the crystal or the peripheral metal and non-metallic clamping parts, which still causes damage and pollution, and the light entering the output optical path Reflected light will bring stray background, which will affect the life of the whole machine and beam quality

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