Accession Number : AD0904714

Title :   Sonic Casting of CdTe for High Power IR Laser Windows.

Descriptive Note : Final technical rept. 1 Jun 71-30 Jun 72,

Corporate Author : TYCO LABS INC WALTHAM MA

Personal Author(s) : Siegel, B. ; Wald, F. ; Bates, H. E.

Report Date : SEP 1972

Pagination or Media Count : 88

Abstract : This report describes the results of an exploratory development program whose primary objective was to demonstrate the feasibility of sonically casting CdTe windows for application in high energy CO2 laser systems. Equipment was designed, procured, and built, resulting in the capability to vibrate the molten CdTe charge while simultaneously affecting a directional solidification. During the course of the program, the grain size goal was deemphasized and the bulk of the effort was directed toward lowering the absorption at 10.6 mu. The bulk of the effort was carried out employing the halide dopant scheme. After establishing the feasibility of sonically casting CdTe, a significant effort was made in improving the materials handling procedures to prevent the undesirable addition of electrically active contaminants. Relatively uniform ingots were produced with absorption coefficients at 10.6 mu of 0.004/cm. A clean process, employing halide dopants, achieved toward the end of the program of a 100% yeild of high resistivity (about 10 to the sixth power omega-cm), high transmission, pore-free, as-cast windows.

Descriptors :   *CASTING), (*INFRARED WINDOWS, (*CADMIUM COMPOUNDS, CASTING), FEASIBILITY STUDIES, TELLURIDES, CARBON DIOXIDE, SOUND, HANDLING, ELECTRICAL RESISTANCE, GAS LASERS, INFRARED LASERS, ABSORPTION, SOLIDS, DOPING, SEMICONDUCTORS, VIBRATION.

Subject Categories : Lasers and Masers
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE