Quantum efficiencies of imaging detectors with alkali halide photocathodes. I - Microchannel plates with separate and integral CsI photocathodes

Details Quantum efficiencies of imaging detectors with alkali halide photocathodes. I - Microchannel plates with separate and integral CsI photocathodes Quantum efficiencies of imaging detectors with alkali halide photocathodes. I - Microchannel plates with separate and integral CsI photocathodes

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apopt..26.2925c&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 26, July 15, 1987, p. 2925-2930. NASA-Navy-supported research.

Physics

Optics

5

Alkali Halides, Image Correlators, Microchannel Plates, Photocathodes, Quantum Efficiency, Cesium Iodides, Charge Coupled Devices, Far Ultraviolet Radiation, Signal To Noise Ratios

Scientific paper

Measurements and comparisons have been made of the quantum efficiencies of microchannel plate (MCP) detectors in the far-UV (below 2000-A) wavelength range using CsI photocathodes (a) deposited on the front surfaces of microchannel plates and (b) deposited on solid substrates as opaque photocathodes with the resulting photoelectrons input to microchannel plates. The efficiences were measured in both pulse-counting and photodiode modes of operation. Typical efficiencies are about 15 percent at 1216 A for a CsI-coated MCP compared with 65 percent for an opaque CsI photocathode MCP detector. Special processing has yielded an efficiency as high as 20 percent for a CsI-coated MCP. This may possibly be further improved by optimization of the tilt angle of the MCP channels relative to the front face of the MCP and incident radiation. However, at present there still remains a factor of at least 3 quantum efficiency advantage in the separate opaque CsI photocathode configuration.

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