Accession Number : AD0609036

Title :   TRANSMITTANCE OF OPTICAL MATERIALS AT HIGH TEMPERATURES IN THE 1- TO 12-MICRON RANGE.

Descriptive Note : Rept. for Jun 61-Jul 63,

Corporate Author : NAVAL ORDNANCE TEST STATION CHINA LAKE CALIF

Personal Author(s) : Gillespie,D. T. ; Olsen,A. L. ; Nichols,L. W.

Report Date : OCT 1964

Pagination or Media Count : 33

Abstract : Transmittance measurements of optical materials were made at 25, 100, 200, 300, and 400C in the 1- to 12-micron range. A continuous proportioning temperature control system was designed to establish rapidly and to maintain precisely a given temperature level in specially constructed high-temperature cells. The following materials, which are dielectrics and semiconductors of potential use as windows and IRDOMES in optical systems at high temperatures, were selected: Corning glasses 0160, 8363, and 7905; water-free quartz; Barr and Stroud calcium aluminate, 37A and 39A; sapphire; IRTRAN-1 and IRTRAN-2; silver chloride; sodium chloride; silicon; and germanium. The results of the investigation are presented as transmittance vs. wavelength at the five temperatures. The transmittance of dielectrics remains relatively unaffected up to 400C; optical materials of this class are restricted in use at the higher temperatures only in the shift of the long wavelength transmittance limit. With the semiconductors silicon and germanium, the absorption edge is shifted to longer wavelengths and the over-all transmittance is greatly reduced with increase of temperature.

Descriptors :   (*INFRARED RADIATION, OPTICAL MATERIALS), (*DIELECTRICS, WAVE PROPAGATION), (*SEMICONDUCTORS, WAVE PROPAGATION), (*OPTICAL MATERIALS, WAVE PROPAGATION), GLASS, QUARTZ, CALCIUM COMPOUNDS, ALUMINATES, SAPPHIRE, SILVER COMPOUNDS, CHLORIDES, SODIUM COMPOUNDS, SILICON, GERMANIUM, HEAT RESISTANT MATERIALS, SPECTROPHOTOMETERS, TEMPERATURE CONTROL

Distribution Statement : APPROVED FOR PUBLIC RELEASE