"DEVELOPMENT OF A UNIQUE LABORATORY STANDARD INDIUM GALLIUM ARSENIDE DETECTOR FOR THE 0.5-1.7 MICRON SPECTRAL RANGE "

SPECTRAL MEASUREMENTS OVER THE VISIBLE/NEAR-INFRARED 0.5-1.7 MICRON RANGE CANNOT BE DONE AT PRESENT WITH A SINGLEDETECTOR. TWO SEPARATE DETECTORS (SILICON FOR 0.5-1.1 MICRONS AND GERMANIUM FOR 1.0-1.7 MICRONS) MUST PRESENTLY BE USED IN ORDER TO COVER THE ENTIRE SPECTRAL RANGE. THIS COMPLICATES MEASUREMENT PROCEDURES AND ADDS COST AND EXTRA COMPONENTS TO THE SYSTEM. WE PROPOSE TO DEVELOP A LARGE-AREA INDIUM GALLIUM ARSENIDE (INGAAS) DETECTOR WHICH WILL HAVE HIGH QUANTUM EFFICIENCY OVER THE 0.5-1.7 MICRON SPECTRAL RANGE AND ALLOW A SINGLE DETECTOR TO BE USED IN PLACE OF BOTH SILICON AND GERMANIUM. NO SUCH DETECTOR EXISTS AT THIS TIME. THESE INGAAS DETECTORS WOULD HAVE HIGHUNIFORMITY AND WOULD BE WELL SUITED AS CALIBRATION STANDARDSFOR THE 0.5-1.7 MICRON SPECTRAL REGION. INTERNAL QUANTUM EFFICIENCIES SHOULD BE NEAR 100% OVER MUCH OF THIS RANGE. THE HYDRIDE VAPOR PHASE EPITAXY (VPE) TECHNIQUE WILL BE USED TO SYNTHESIZE LAYERS OF INGAAS AND INP FROM WHICH THESEDETECTORS WILL BE MADE. THE INP THICKNESS WILL BE VARIED TODETERMINE ITS EFFECT ON QUANTUM EFFICIENCY. DETAILED RADIOMETRIC CALIBRATION METHODS WILL BE CARRIED OUT AT THE OPTICAL SCIENCES CENTER AT THE UNIVERSITY OF ARIZONA.