Method for developing monocrystal of potassium dihydrogen phosphate in large aperture rapidly

Abstract

A process for quickly growing the large-diameter monocrystal of potassium dihydrogen phosphate by solution temp lowering method features that the consumptions of potassium chloride and EDTA are respectively 1-5 M% and 0.01-0.02 Wt%, the initial over-saturation is 8 deg.C for maximum, and the temp lowering speed is 0.3-0.5 deg.C per day for initial growing stage and 2 deg.C per day for fast growing stage.

Description

technical field [0001] The present invention relates to crystal growth, in particular to large aperture potassium dihydrogen phosphate (KH 2 PO 4 , referred to as KDP) single crystal rapid growth method. Background technique [0002] KDP crystal is an excellent nonlinear optical material, which is mainly used in the second, third, and fourth times of laser frequency doubling, especially the high-quality large-size KDP crystal, which has been listed as the only practical material for laser nuclear fusion frequency conversion internationally. , is also a hot topic in international crystal growth research. So far, most of them still use traditional methods to grow single crystals. Although the commonly used cooling method, constant temperature flow method, constant temperature evaporation replenishment solution method, etc. can also grow single crystals with better quality and larger size, the growth rate is too high. Slow, the growth cycle is too long, the cost is too high,...

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Problems solved by technology

However, the purity of raw materials used in this method is very high, and the cost will also increase accordingly. Moreover, the solution must be circulated and filtered during the crystal growth process, and the equipment cost is high.