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16 August 1988 Spatial Frequency Response Of Proximity Focused Image Tubes In The Near Ultraviolet
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The spatial frequency response of proximity focused image tubes is inversely proportional to the photoelectron emission energy which is, in turn, dependent on the incident photon energy and the photocathode work function. While the relationship is understood, it is difficult to calculate the spatial frequency response because of the uncertainty in the emission characteristics of a given photocathode. This paper compares the results of measuring the MTF vs. wavelength of three microchannel plate image tubes having S-20, K2CsSb and Cs2Te photocathodes deposited on quartz faceplates. Emphasis is on the wavelength range from 200 to 400 nm where the photon energy significantly exceeds the photocathode band gap. When the photon energy is high enough photoelectron pair production begins to occur there is a decrease in the photoelectron emission energy and corresponding improvement in spatial frequency response.
© (1988) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. L. Lowrance, A. D. Cope, and C. R. Stergis "Spatial Frequency Response Of Proximity Focused Image Tubes In The Near Ultraviolet", Proc. SPIE 0932, Ultraviolet Technology II, (16 August 1988);


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