半导体激光倍频晶体硫氰酸汞镉(CMTC)显微结晶的研究

Study on Micro-crystallization of Cadmium Mercury Thiocyanate (CMTC) Crystal for Laser Diode Frequency Doubling

采用显微结晶 ,系统地观察、研究了半导体激光 (LD)倍频材料CMTC晶体在KCl/H2 O的溶剂体系中 ,不同条件下的结晶习性。结果给出 :在KCl浓度为 3%～ 10 %范围 ,pH值为 3.0～ 4 .3范围时 ,结晶形态规则 ,各项生长速度均匀 ,结晶透明 ;pH值为 2 .0～ 3.0条件下 ,z轴方向生长速度变快 ,a轴方向生长速度变慢 ;杂质严重影响了结晶的质量和外形 ;溶液稳定性随时间的增长和温度的升高而逐渐变差。本文分析了CMTC单晶生长和定向生长适宜的溶液条件和关键。

Crystallization behavior and habits of cadmium mercury thiocyanate (CMTC) crystal for laser diode frequency doubling in KCl/H 2O solvent systems with different KCl concentrations were observed and investigated by means of micro crystallization experiments.The results show that CMTC crystal exhibits regular crystalline morphologies,homogenous growth speed in different directions and is transparent when the concentration of KCl ranges from 3%-10% and pH value ranges from 3.0-4.3.When pH value ranges from 2.0-3.0,the growth speed along z axis direction increases and along a axis direction decreases.Impurities influence greatly crystalline quality and morphology.With time passing and temperature increasing the stability of solution becomes poor.Suitable solution conditions and key factors for CMTC crystal growth and oriented growth were put forward.