Preparation method of KTP crystal with anti-soil performance

Abstract

The invention discloses a method for preparing a KTP crystal capable of resisting gray track, comprising the following steps that: 1) KH2PO4 and TiO2 as raw materials used to synthesize a KTiOPO4 crystal, and K2HPO4 as the raw material used to synthesize a K4P2O7(K4) solvent are mixed according to a certain ratio, and the initial growth mol ratio of the KTiOPO4 to the K4P2O7 obtained after the chemical reaction is about 0.8; 2) the mixed raw materials are put in a platinum crucible and the solution filling amount is between 75 and 85 percent; 3) the platinum crucible is put in a furnace body, a temperature gradient of the furnace is set to be between 3 and 8 DEG C per 10 centimeters, and the furnace is heated so that the raw materials are melted and react to form an even and stable high temperature solution; and 4) the seed crystal is put in the high temperature solution, the temperature is reduced at a temperature gradient of between 1 and 8 DEG C per 100 hours, and the KTiOPO4 crystal is grown at a temperature interval of between 850 and 820 DEG C. The method utilizes the K4P2O7 solvent to prepare the KTP crystal, reduces the absorption coefficient of the KTP crystal, and has evident anti-gray track performance; therefore, the frequency multiplication conversion efficiency of the KTP is improved further, the KTP crystal has good voltage withstanding and modulation performances and can be used as an electrooptical crystal.

Description

technical field [0001] The invention relates to the field of crystal materials, in particular to a method for preparing KTP crystals with anti-ash stain performance. Background technique [0002] Potassium titanyl phosphate (KTiOPO 4 KTP for short) crystal is an internationally recognized nonlinear optical crystal with superior comprehensive performance. It has the advantages of large nonlinear coefficient, good optical uniformity, good thermal conductivity, wide transmission band, etc., and has good physical, chemical and mechanical properties. It is currently the best material for 1.06μm frequency doubling of small and medium power Nd lasers. one. It is widely used in laser medical treatment, large-scale integrated circuit processing, laser communication, military blinding, lighting stage and other fields. From crystal growth and processing to optoelectronic devices, a relatively large-scale industrial market has been formed internationally. [0003] At present, people...

AI Technical Summary

Problems solved by technology

The commonly used flux is K 6 P 4 o 13 Solvent (K6 for short), the method of preparing KTP crystals with K6 flux, has a wide growth temperature range, lower requirements for temperature control equipment, easy control of the growth process, large amount of crystal precipitation and easy growth of high-quality large-size crystals, etc. application, but studies have shown that this kind of KTP crystal prepared with K6 flux, in the nonlinear frequency conversion of high peak power infrared laser, due to the high energy of green light photons generated by frequency doubling, often with the use of time Cause photo-induced damage to the KTP crystal device to form gray traces. The formation of gray traces will absorb a large amount of fundamental frequency light and frequency-doubled light waves, resulting in severe local heating of the crystal, resulting in thermally induced changes in the crystal refractive index and destroying the phase matching conditions of the crystal. The frequency doubling efficiency is severely reduced, resulting in poor stability of the laser

At the same time, due to the obvious high-temperature denudation effect of the K6 flux on the platinum crucible, the denuded platinum ions enter the crystal and increase the absorption coefficient of the crystal, which will also cause the device to heat up along the optical path, reducing the laser damage resistance threshold of the crystal. further reduces the nonlinear efficiency of the crystal

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