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Proceedings Paper

Improvements To A High-Frequency Fiber-Optic System For Plasma Diagnostics
Author(s): J. W. Ogle; P. B. Lyons; L. Looney; L. Hocker; M. A. Nelson; P. A. Zagarino; T. J. Davies; R. D. Simmons; R. Selk; B. Hopkins
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Paper Abstract

A system for high-frequency recording of plasma diagnostics has previously been reported. Substantial improvements have been made in the system response, dynamic range, and calibration of the system. Plastic-clad silica fiber is used as a radiation-to-light converter using the Cerenkov process. A spectral equalizer device is used to compensate for the material dispersion in the fiber, increasing the frequency response (,1 GHz-km) and the dynamic range (a factor of >20 over a FWHM 1 nm, 50% transmitting interference filter). The calibration system uses a pulsed injection laser diode (<100 ps FWHM) injected into the fiber at the radiation end of the fiber and detected by a microchannel plate photomultiplier tube on the recording end. The injection laser diode is triggered by a synchronous trigger delay unit, which also triggers a sampling or real time scope after as much as 10 μs delay with <50 ps jitter. The system improvements will be desribed in more detail and the utility of these components in other plasma diagnostic systems will be discussed.

Paper Details

Date Published: 22 January 1982
PDF: 6 pages
Proc. SPIE 0296, Fiber Optics in Adverse Environments I, (22 January 1982); doi: 10.1117/12.932445
Show Author Affiliations
J. W. Ogle, Los Alamos National Laboratory (United States)
P. B. Lyons, Los Alamos National Laboratory (United States)
L. Looney, Los Alamos National Laboratory (United States)
L. Hocker, EG&G, Inc. (United States)
M. A. Nelson, EG&G, Inc. (United States)
P. A. Zagarino, EG&G, Inc. (United States)
T. J. Davies, EG&G, Inc. (United States)
R. D. Simmons, EG&G, Inc. (United States)
R. Selk, EG&G, Inc. (United States)
B. Hopkins, EG&G, Inc. (United States)

Published in SPIE Proceedings Vol. 0296:
Fiber Optics in Adverse Environments I
Peter B. Lyons, Editor(s)

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