Method for measuring deuteration rate of single crystal of potassium dideuterium phosphate

Abstract

A method for measuring single crystal deuterating rate of dideuteropotassium phosphate includes applying NETZSCHSTA 449 c thermogravimeter ; setting temperature up rising program as staring from 30 deg.c , heating up to 260 deg.c with speed rate of 5 deg.c / min and holding constant temperature for one hour , then heating up to 450 deg.c with speed rate of 5 deg.c / min and holding constant temperature for one hour to obtain a thermogravimetric curve ; calculating out weight loss rate from said curve and substituting it into formula of x ( % ) = [ ( x / 1 - x ) x 58.648 - 8.948 ] x 100 for deriving out deuterating rate of DKDP crystal sample .

Description

technical field The present invention relates to diduterium potassium phosphate (K(D X h 1-X ) 2 PO 4 , referred to as DKDP) simple method of measuring the deuteration rate of single crystal. Background technique The tetragonal potassium dihydrogen phosphate crystal with high deuteration rate is a kind of electro-optic modulation crystal widely used in laser technology. The electro-optic and nonlinear optical properties of DKDP crystals are directly proportional to its deuteration rate, so accurate measurement of the deuteration rate of tetragonal DKDP crystals plays a decisive role in DKDP crystals as optical modulators, optical frequency converters and other optical devices. role. It is well known that the deuteration rate of DKDP crystals is usually lower than that in its growth solution, so it cannot be equated to the deuteration rate of DKDP single crystal simply by measuring the deuteration rate in the growth solution, but it should be measured directly The deut...

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Problems solved by technology

But this method is very cumbersome, and the test crystal sample must have two smooth crystal planes parallel to each other

Yu Shuqin and others reported on the 1986 Volume 15, No. 2 issue of "Journal of Synthetic Crystals" that the deuteration rate of DKDP crystals was determined by gravimetric method. 4 grams of DKDP bulk crystals in a platinum crucible are kept at 400°C for half an hour. It is difficult to determine whether the crystals are completely decomposed, and the residual KPO after heating and decomposition 3 Because it is easy to absorb moisture, it is difficult to weigh the weight on the electronic balance to a constant weight, and the measured deuteration rate is inaccurate

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