Improvements To A High-Frequency Fiber-Optic System For Plasma Diagnostics

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

doi:10.1117/12.932445

22 January 1982 Improvements To A High-Frequency Fiber-Optic System For Plasma Diagnostics

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

Author Affiliations +

Proceedings Volume 0296, Fiber Optics in Adverse Environments I; (1982) https://doi.org/10.1117/12.932445
Event: 25th Annual Technical Symposium, 1981, San Diego, United States

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.

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J. W. Ogle, P. B. Lyons, L. Looney, L. Hocker, M. A. Nelson, P. A. Zagarino, T. J. Davies, R. D. Simmons, R. Selk, and B. Hopkins "Improvements To A High-Frequency Fiber-Optic System For Plasma Diagnostics", Proc. SPIE 0296, Fiber Optics in Adverse Environments I, (22 January 1982); https://doi.org/10.1117/12.932445

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