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Preparation method of KTP (KTiOPO4) crystal capable of effectively resisting gray track

An anti-gray trace and crystal technology, applied in the field of KTP crystal preparation, can solve the problems of noise enhancement, frequency doubling efficiency reduction, laser output power reduction and other problems, and achieves resistance to gray trace generation, reduction of absorption coefficient, and enhancement of frequency doubling conversion efficiency. Effect

Inactive Publication Date: 2011-11-16
INNOWIT
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Problems solved by technology

Once the gray trace is formed, it will absorb a large amount of propagating light energy beams, resulting in a series of consequences such as crystal heating, frequency doubling efficiency reduction, laser output power reduction, and noise enhancement. Continued operation may even cause irreversible damage to KTP

Method used

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  • Preparation method of KTP (KTiOPO4) crystal capable of effectively resisting gray track
  • Preparation method of KTP (KTiOPO4) crystal capable of effectively resisting gray track

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Embodiment Construction

[0012] In a platinum crucible, the raw material K 2 HPO 4 , K 2 CO 3 ,TiO 2 After mixing according to the appropriate proportion, heat up to 1100°C to melt and react the raw materials, and stir at constant temperature to form a uniform and stable high-temperature solution;

[0013] The reaction produces the chemical equation of K6 co-solvent and KTP:

[0014] K6 co-solvent: 4KH 2 PO 4 +K 2 CO 3 ——K 6 P 4 o 13 +4H 2 O+CO 2

[0015] KTP: KH 2 PO 4 +TiO 2 ——KTiOPO 4 +H 2 o

[0016] The [100] direction seed crystal is used to grow KTP crystals by combining the top seed crystal and pulling method, the cooling speed is slow, and the speed increase is high. Increase the melt concentration by about 45%, and increase its growth temperature. Add PbO, the initial growth temperature is ~1007°C, and the temperature is lowered to 78°C,

[0017] Using this method, under the above conditions, after 45 days, the temperature was lowered at a rate of 0.5-3°C / day, the pullin...

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Abstract

The invention relates to a preparation method of a KTP (KTiOPO4) crystal capable of effectively resisting a gray track. The preparation method comprises the following steps: 1) using a top seed crystal and a drawing method, slowly cooling and slightly raising drawing speed; 2) increasing the melt concentration and raising the growth temperature; 3) increasing the solvent composition; 4) using a seed crystal in the [100] direction and a single growth area; and 5) adding PbO, controlling the initial growth temperature at not more than 1007 DEG C, cooling to 78 DEG C at a cooling rate of 0.5-3 DEG C / day for 45 days, and controlling the drawing speed at 0.1-0.9 mm / day and positive and negative rotation speed at 60-20 rpm. In the invention, the top seed crystal and the drawing method are utilized to prepare the KTP crystal, thus the absorption coefficient of the KTP crystal is reduced, and the KTP crystal can effectively resist the generation of a gray track, so that the frequency-doubling conversion efficiency of the KTP crystal is enhanced.

Description

technical field [0001] The invention relates to the field of nonlinear crystal materials, and relates to a method for preparing an artificially grown KTP crystal that can effectively resist gray stains. 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 frequency doubling coefficient, high conversion efficiency, good temperature stability, strong light damage resistance, good machining performance and stable chemical properties. It is recognized as the best frequency doubling material for solid-state lasers from 1064 to 532nm, and has been awarded wide and important applications. However, KTP is not perfect. Under the long-term action of high power density, it produces the so-called "grey track" visible to the naked eye. Once the gray trace is formed, it will absorb a large amount of propagating light en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B9/08C30B29/14
Inventor 董胜明冯彧翟仲军严振华李杰刘萌
Owner INNOWIT
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