Accession Number : AD0602212

Title :   OPTICAL SECOND-HARMONIC GENERATION IN SEMICONDUCTOR ALLOYS.

Descriptive Note : Interim rept. for Jan 62-Dec 63,

Corporate Author : STANFORD UNIV CALIF STANFORD ELECTRONICS LABS

Personal Author(s) : Soref,R. A.

Report Date : DEC 1963

Pagination or Media Count : 102

Abstract : Optical second-harmonic generation in semiconductors has been studied experimentally and theoretically to learn how energy-band structure and lattice symmetry influence the efficiency of harmonic conversion. Using a pulsed Nd3+: glass laser, harmonic generation was measured as a function of alloy composition in wurtzite ZnS-CdS and CdS-CdSe monocrystals to determine the effect of setting the energy gap at values either greater or less than the harmonic photon energy. In the CdS-CdSe series, the harmonic radiation was readily observable despite the strong absorption of harmonic light. The influence of lattice symmetry was studied by comparing harmonic generation in zinc-blende and wurtzite semiconductors having similar energy gaps, namely ZnSe, ZnTe, GaP, GaAs, CdS, CdSe, cubic ZnS, and hexagonal ZnS. It was found that the lattice structure had less effect upon the magnitude of these susceptibility-tensor components than the band structure. (Author)

Descriptors :   (*SEMICONDUCTORS, OPTICAL PROPERTIES), ABSORPTION SPECTRA, CRYSTAL LATTICES, ZINC COMPOUNDS, SULFIDES, CADMIUM COMPOUNDS, SELENIDES, SINGLE CRYSTALS, GALLIUM COMPOUNDS, LIGHT, ELECTROMAGNETIC RADIATION, QUANTUM THEORY, PHOTONS, CADMIUM ALLOYS, LASERS, POLARIZATION, ARSENIDES, PROPAGATION, WAVE FUNCTIONS, GALLIUM ALLOYS, CRYSTAL STRUCTURE, MATHEMATICAL MODELS, TELLURIDES, PHOSPHIDES

Distribution Statement : APPROVED FOR PUBLIC RELEASE