Accession Number : ADA115973

Title :   Optical Properties of Material for the Infrared.

Descriptive Note : Final technical rept.1 Apr 78-31 Mar 82,

Corporate Author : NATIONAL BUREAU OF STANDARDS WASHINGTON DC

Personal Author(s) : Feldman,Albert

PDF Url : ADA115973

Report Date : May 1982

Pagination or Media Count : 16

Abstract : The piezobirefringence of calcium fluoride, barium fluoride, strontium fluoride, gallium arsenide, and cadmium fluoride has been measured in the infrared over the wavelength range 3.5 to 11 micrometers. A large dispersion was found in the coefficients of the fluorides; moreover, some of the coefficients were observed to reverse sign. The data for GaAs showed a small yet significant dispersion. The data for the alkaline-earth fluorides were fitted to a three parameter strain-dependent oscillator representation of the infrared-active transverse-optic (TO) phonon; the predominant contribution to the dispersion comes from the strain-induced TO phonon splitting; estimates were made to the strain-induced oscillator strength anisotropy. The GaAs data were fitted to the same model but with only two free parameters; here the predominant contribution to the dispersion came from the estimated strain-induced oscillator strength anisotropy of the TO phonon; the experimental data agree fairly well with the theory of Humphreys and Maradudin. The absolute piezo-optic constants have also been obtained at discrete laser wavelengths for the fluorides. (Author)

Descriptors :   *Optical properties, *Infrared optical materials, *Piezoelectricity, *Birefringence, Barium compounds, Fluorides, Calcium fluorides, Measurement, Gallium arsenides, Oscillators

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE