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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 15, Iss. 11 — Nov. 1, 1976
  • pp: 2645–2648

Modulated submillimeter laser interferometer system for plasma density measurements

S. M. Wolfe, K. J. Button, J. Waldman, and D. R. Cohn  »View Author Affiliations


Applied Optics, Vol. 15, Issue 11, pp. 2645-2648 (1976)
http://dx.doi.org/10.1364/AO.15.002645


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Abstract

A high resolution submillimeter interferometer system for measurement of electron densities in the 1014-cm−3ne ≤ 2 × 1015-cm−3 range has been developed for use in high density tokamaks. Phase modulation at ~1 MHz is accomplished by difference frequency mixing of two cavity tuned laser oscillators. The optically pumped CH3OH lasers, which operate on the 118.8-μm line, feature a novel output coupling design that permits good mode quality and low beam divergence. The beat signals are detected using a newly developed Ge:Li photoconductor, and a direct measurement of the phase shift is obtained from the time lag between probe and reference signals. The sensitivity of the resulting phase measurement is independent of the instantaneous phase and unaffected by fluctuations in the amplitude or in the frequency of the modulation.

© 1976 Optical Society of America

History
Original Manuscript: April 6, 1976
Published: November 1, 1976

Citation
S. M. Wolfe, K. J. Button, J. Waldman, and D. R. Cohn, "Modulated submillimeter laser interferometer system for plasma density measurements," Appl. Opt. 15, 2645-2648 (1976)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-15-11-2645


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References

  1. R. R. Parker, Bull. Am. Phys. Soc. 20, 1572 (1975).
  2. K. Young, “Diagnostic Needs for Large Tokamak Plasmas,” in Conference on Diagnostics of High Temperature Plasmas (Knoxville, Tenn., 1976).
  3. M. Rosenbluh, R. J. Temkin, K. J. Button, Appl. Opt.15, 0000 (1976). (to be published). [CrossRef]
  4. H. R. Fetterman, H. R. Schlossberg, Microwave J. 17, 11 (1974).
  5. M. H. Heald, C. B. Wharton, Plasma Diagnostics With Microwaves (Wiley, New York, 1965).
  6. D. Véron, Opt. Commun. 10, 95 (1974). [CrossRef]
  7. D. T. Hodges, T. S. Hartwick, Appl. Phys. Lett. 23, 252 (1973). [CrossRef]
  8. S. M. Wolfe, MIT; unpublished.
  9. R. Ulrich, Infrared Phys. 7, 37 (1967). [CrossRef]
  10. R. Ulrich, K. F. Renk, L. Genzel, IEEE Trans. Microwave Theory Tech. MTT-11, 363 (1963). [CrossRef]
  11. J. Waldman, S. M. Wolfe, L. Darken, T. S. Chang (to be published).
  12. G. E. Stillman, C. M. Wolfe, I. Melngailis, C. D. Parker, P. E. Tannenwald, J. O. Dimmock, Appl. Phys. Lett. 3, 83 (1968). [CrossRef]
  13. B. J. H. Meddens, R. J. Taylor, MIT Plasma Physics Report PRR7411 (August1974).
  14. D. T. Hodges, Aerospace Corp., unpublished communication.

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