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Proceedings Paper

Fast optical gating using planar-lead MCPIIs and linear microstrip impedance transformers
Author(s): Matthew C. Thomas; George J. Yates; Paul A. Zagarino
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Paper Abstract

A proximity focused microchannel plate image intensifier (MCPII) with low inductance planar-lead gating electrodes was successfully operated as an optical shutter with a 220 ps full- width gate image. The MCPII (made by RTC Phillips) was gated on with single-shot, 290 ps FWHM, -500 V pulses from a 50 (Omega) source impedance pulse generator. The limiting resolution of the MCPII's output image in the center of the gate pulse was 8 lp/mm. The characteristic impedance of the 18 mm diameter MCPII was calculated to be 4.5 (Omega) . High-bandwidth microstrip impedance-transforming transmission lines were made out of a substrate with a dielectric constant of 10.2 to interface between the 50 (Omega) impedance of the gate pulser and the 4.5 (Omega) impedance of the MCPII. The shape and width of the microstrip transformer's signal conductor, the lengths of the transformer's sections, and the linearity of the impedance changes were all modeled and two designs were fabricated and tested for comparison along with a shorter, straight-taper design originally used several years ago. The design resulting in the lowest pulse dispersion and the fastest gating speed was one where the impedance changed linearly with distance.

Paper Details

Date Published: 14 October 1994
PDF: 12 pages
Proc. SPIE 2273, Ultrahigh- and High-Speed Photography, Videography, and Photonics '94, (14 October 1994); doi: 10.1117/12.189029
Show Author Affiliations
Matthew C. Thomas, EG&G Energy Measurements, Inc. (United States)
George J. Yates, Los Alamos National Lab. (United States)
Paul A. Zagarino, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 2273:
Ultrahigh- and High-Speed Photography, Videography, and Photonics '94
George A. Kyrala; Donald R. Snyder, Editor(s)

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