OSA's Digital Library

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


View Full Text Article

Enhanced HTML    Acrobat PDF (782 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

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

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited