High photon counting efficiency in the near-IR (0.6 micron - 0.9 micron) with a GaAs RANICON

Details High photon counting efficiency in the near-IR (0.6 micron - 0.9 micron) with a GaAs RANICON High photon counting efficiency in the near-IR (0.6 micron - 0.9 micron) with a GaAs RANICON

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1235..144c&link_type=abstract

IN: Instrumentation in astronomy VII; Proceedings of the Meeting, Tucson, AZ, Feb. 13-17, 1990 (A91-29601 11-35). Bellingham, WA

Astronomy and Astrophysics

Astronomy

Gallium Arsenides, Microchannel Plates, Near Infrared Radiation, Photocathodes, Photometers, Pixels, Spatial Resolution

Scientific paper

Results are presented of an evaluation of the first RANICON detector with a Negative Electron Affinity (NEA) photocathode, known as the Red-RANICON. The Red-RANICON offers a photocathode responsive quantum efficiency of about 22 percent from 0.6 - 0.9 micron, yielding a significant improvement in photon counting performance when compared with multialkali (S20) photocathode detectors. The operating characteristics of the Red-RANICON are similar to standard 25-mm active-area RANICONS, with imaging formats of 512 x 512 or 1024 x 1024 pixels. Spatial resolution is currently about 80 microns FWHM and could be improved to 40 microns FWHM with a modest decrease in the photocathode to microchannel-plate gap. The application of the Red-RANICON to high-resolution imaging and other applications requiring excellent temporal resolution is discussed. Future prospects for improving the long-wavelength response and quantum yield are also explored.

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