Photon-counting imaging with a GaAs photocathode - Evaluation of the Red-Ranicon for astronomical imaging

Details Photon-counting imaging with a GaAs photocathode - Evaluation of the Red-Ranicon for astronomical imaging Photon-counting imaging with a GaAs photocathode - Evaluation of the Red-Ranicon for astronomical imaging

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...225..578c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 225, no. 2, Nov. 1989, p. 578-584. Research supported by the Space Telescope S

Astronomy and Astrophysics

Astronomy

6

Astronomy, Gallium Arsenides, Image Processing, Photocathodes, Photons, Quantum Counters, Electron Affinity, High Resolution, Imaging Spectrometers, Microchannel Plates, Spatial Resolution, Speckle Interferometry

Scientific paper

The operating characteristics of the first photon-counting Ranicon detector to incorporate a GaAs photocathode are discussed. The detector is a microchannel plate system employing a resistive anode to encode positional information. Detector resolution is determined to be 76 microns FWHM with the possibility to improve this figure by optimization of system parameters and design constraints. The detector exhibits negligible dark noise at temperatures of less than -35 C and is otherwise similar in operating characteristics to multialkali photocathode Ranicons. The GaAs Ranicon is particularly suited to applications requiring good temporal performance such as high resolution imaging. This paper briefly discusses high-resolution imaging techniques and reviews the Ranicon's suitability for their requirements.

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