14 January 1986 Shuttering Efficiencies Of Nanosecond-Gated Photoemissive Shutter Tubes
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Recent studies show that effective shuttering of photoemissive tubes, such as Silicon-Intensified-Target Vidicons (SITVs) and Microchannel-plate Image Intensifier Tubes (MCPTs), can vary widely depending upon the extent of their opacity to an input flux of photons. Optical feedthrough signals from photon transmission through the photocathode to the target or phosphor ranging from 10-4 to 10-9 (when compared with gated signals) were measured for a large sampling of commerically available units. Effective shutter ratios of 105 to 108 measured for units operated in quiescently dark environments can be substantially reduced by optical feedthrough. Furthermore, ineffective suppression of photoemission can cause further reductions in shutter ratio. Reductions are roughly correlated with the ratio of optical gate duration to light pulse duration. Experimentation with various thicknesses of aluminum depositions on MCPT phosphors and chromium layering on SITV silicon targets indicate substantial reductions (2x to 15x) in transmission with minimal increases in threshold voltages required for gain. These results, together with exploratory studies of external coating of output fiber optics with transmission filters spectrally matched to minimize feedthrough to P-20 phosphors are reported.
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George J. Yates, George J. Yates, Steven A. Jaramillo, Steven A. Jaramillo, Thomas S. Pagano, Thomas S. Pagano, J. Paul Black, J. Paul Black, } "Shuttering Efficiencies Of Nanosecond-Gated Photoemissive Shutter Tubes", Proc. SPIE 0569, High Speed Photography, Videography, and Photonics III, (14 January 1986); doi: 10.1117/12.949873; https://doi.org/10.1117/12.949873

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