NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Quantum efficiencies of imaging detectors with alkali halide photocathodes. I - Microchannel plates with separate and integral CsI photocathodesMeasurements 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.
Document ID
19870061171
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Carruthers, George R.
(U.S. Navy, Naval Research Laboratory, Washington DC, United States)
Date Acquired
August 13, 2013
Publication Date
July 15, 1987
Publication Information
Publication: Applied Optics
Volume: 26
ISSN: 0003-6935
Subject Category
Electronics And Electrical Engineering
Accession Number
87A48445
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available