Accession Number : AD0919812

Title :   10.6 Micrometer PbSnTe Mosaic Development.

Descriptive Note : Final rept. 1 Mar 73-28 Feb 74,

Corporate Author : ROCKWELL INTERNATIONAL THOUSAND OAKS CA SCIENCE CENTER

Personal Author(s) : Andrews, A. Michael

Report Date : MAY 1974

Pagination or Media Count : 94

Abstract : Development of a technology to produce Pb sub 1-x Sn sub x Te, heterostructure mosaic detector arrays capable of gigahertz operation for the CO2 laser radar track and receive system is reported. The results include two main areas: (1) Technology developed to produce 4-element mosaics with a working mosaic delivered to Rome Air Development Center for use in the RADC/CORAL CO2 track and receive radar system. (2) Technology developed for a new device configuration - the inverted heterostructure photodiode that has reduced noise and dead space and is easily multiplexed. A heterostructure mosaic was delivered to RADC that prossessed the following properties as measured at the Science Center: 1) prediced frequency response of 1.4 GHz to 1.7 GHz; 2) average quantum efficiency 97% with + or- 2% variation and + or - 10% absolute accuracy; and 3) dark currents of 0.9 mA + or - 0.2 mA. Electrical crosstalk was lower than - 15 dB while the optical crosstalk was lower than -25dB. With the use of a 10 ohm input -50 ohm output amplifier having a 3 dB noise figure over its 2 KHz to 2 GHz bandwidth, the mosaic should achieve a minimum detectable power near 3 x 10 to the -20th power W/Hz.

Descriptors :   (*MOSAICS(DETECTORS), LEAD ALLOYS), (*INFRARED DETECTORS, PHOTODIODES), HETERODYNING, DOPPLER RADAR, RADAR TRACKING, RADAR RECEIVERS, INFRARED LASERS, FAR INFRARED RADIATION, ARRAYS, CARBON DIOXIDE LASERS, OSCILLATORS, MULTIPLEXING, FREQUENCY RESPONSE, SUBSTRATES, TRANSPARENCE, SUBSTRATES, TRANSPARENCE, TIN ALLOYS, TELLURIUM ALLOYS, EPITAXIAL GROWTH, MANUFACTURING, CRYOGENICS, QUANTUM EFFICIENCY, SEMICONDUCTORS, TIN, TELLURIUM.

Subject Categories : Infrared Detection and Detectors
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE