Crystal Growth of Materials for Electro-Optic Modulators
Final rept. 15 Jun 1970-14 Jun 1971
TYCO LABS INC WALTHAM MA
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The report covers two major topics. Crystal growth experiments on Alpha-HgS are reported. The aim here was to use the THM method of solution growth to grow large crystals from K2S4 solvents. So far, no large crystals have been obtained but the general utility of K2S4 as a solvent for the growth of smaller cinnabar crystals could be shown. Also, proustite, lead cesium chloride and bismuth sulfide were grown using the THM method. A method for the calculation of electrooptic coefficients of materials using only basic parameters was developed. Phillips electronegativities, crystallographic data and electronic polarizabilities of the atoms are used as inputs in a computer program which is described. The program outputs the electrooptic coefficients of cubic and noncubic structures. The major test cases were compounds of the zinc- blende structure and good agreement between calculated and experimentally determined electrooptic coefficients is obtained.