Accession Number : ADA292619

Title :   Photon-Counting Spatial Light Modulator Technology Development.

Descriptive Note : Final rept. Sep 92-Sep 94,

Corporate Author : ROCKWELL INTERNATIONAL HUNTSVILLE AL ROCKETDYNE DIV

Personal Author(s) : Holmes, Richard B. ; Hunt, Jeffrey H.

PDF Url : ADA292619

Report Date : 30 OCT 1994

Pagination or Media Count : 76

Abstract : The goal of this program is to measure and improve the performance of photon-counting spatial light modulators operating in an optically-addressed reflection mode. Experimental results are obtained for silicon devices. These device consists of an avalanche photodiode (APD) operated in the Geiger mode with the front and back surface of the diode forming an asymmetric Fabry-Perot cavity. The phase delay within the cavity is modified directly by the avalanche via the free-carrier refractive index or by Joule heating. Experiments were conducted first with the write laser beam at 1064 nm and the read beam at the same wavelength and second with the write beam at 850 nm and the read beam at 1300 nm. The device differs qualitatively from other approaches such as smart pixels by virtue of its photon-counting sensitivity its low cost and its ability to form a spatially-coherent read-out wavefront. (MM)

Descriptors :   *ELECTROOPTICS, *PHOTONS, *LIGHT MODULATORS, *PARTICLE COUNTERS, SPATIAL DISTRIBUTION, SPECIFICATIONS, GALLIUM ARSENIDES, GATES(CIRCUITS), VOLTAGE, OPTICAL MATERIALS, REFLECTION, LASER BEAMS, READ WRITE MEMORIES, DATA REDUCTION, NOISE REDUCTION, PHOTODIODES, PHASE MODULATION, GEIGER COUNTERS, AVALANCHE DIODES.

Subject Categories : Electrooptical and Optoelectronic Devices
      Nuclear Instrumentation
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE