Method and device for online monitoring of fatigue damage of ktp crystal

Abstract

The invention discloses a method and device for performing online monitoring to fatigue damage of KTP crystals. According to the method, the He-Ne laser transmission rate of a laser radiation area can be reduced by utilizing the fatigue damage generated under the mutual action of the KTP crystals and high-strength laser, so that the fatigue damage of KTP crystals can be monitored in an online manner by utilizing He-Ne laser; the device comprises a high-energy laser device, a lens, KTP crystals, a light absorbing pool, a spectroscope, a He-Ne laser device, a first energy meter, a second energy meter, a synchronous controller, a router and a computer control system. the transmission rate of He-Ne laser can be calculated in real time through the computer control system through utilizing the KTP crystals to absorb light, and the fatigue damage status of the KTP crystals can be judged, the on and off of the high-energy laser device can be accurately controlled, and the permanent damage of the KTP crystals can be avoided, the control precision is high, the operation is convenient and simple, and reliable guarantee is provided for accurately determining the fatigue damage of the KTP crystals.

Description

technical field [0001] The invention relates to the technical field of high-power lasers, in particular to a method and device for on-line monitoring of KTP crystal fatigue damage. Background technique [0002] Potassium titanyl phosphate (KTP for short) crystal has large nonlinear coefficient and electro-optic coefficient, and can realize type I and type II phase matching in a wide temperature range. It is an excellent nonlinear optical crystal material. However, the gray trace phenomenon of the laser during the frequency doubling process will strongly absorb the energy of the incident laser light, causing beam distortion, and even causing catastrophic damage to the KTP crystal, which limits the application of the KTP crystal in high-power frequency doubling systems to a certain extent. use. In order to avoid the catastrophic damage of KTP crystal in the high power frequency doubling system, the fatigue damage phenomenon of KTP crystal must be monitored on-line. The use o...

AI Technical Summary

Problems solved by technology

The appearance of dark gray traces on the path of light indicates that the interaction area between the laser and the KTP crystal absorbs a large amount of visible light energy, and the absorption coefficient of visible light increases greatly. The more serious the gray trace, the more serious the absorption of visible light. The lower the lower, resulting in lower frequency conversion efficiency

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