OSA's Digital Library

Applied Optics

Applied Optics


  • Vol. 41, Iss. 1 — Jan. 1, 2002
  • pp: 197–208

Electro-optically modulated polarizing Fourier-transform spectrometer for plasma spectroscopy applications

John Howard  »View Author Affiliations

Applied Optics, Vol. 41, Issue 1, pp. 197-208 (2002)

View Full Text Article

Enhanced HTML    Acrobat PDF (1959 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools



A new electro-optically modulated optical solid-state (MOSS) interferometer has been constructed for measurement of quantities related to the low-order spectral moments of line emission from optically thin radiant media such as plasmas. When Doppler broadening is dominant, the spectral moments give the Radon transform of corresponding moments of the velocity distribution function of the radiating species. The instrument, which is based on the principle of the Fourier-transform spectrometer, has high etendue and is rugged and compact. When electro-optical path-length modulation techniques are employed, the spectral information is encoded in the temporal frequency domain at harmonics of the modulation frequency and can be obtained by use of a single photodetector. Specifically, for a plasma in drifting local thermodynamic equilibrium the zeroth moment (brightness) is given by the average signal level, the first moment (shift) by the interferometric phase, and the second moment (linewidth) by the fringe visibility. To illustrate the MOSS performance, I present spectroscopic measurements of the time evolution of the plasma ion temperature and flow velocity for rf-heated discharges in the H-1 heliac, a toroidal plasma magnetic confinement at the Australian National University.

© 2002 Optical Society of America

OCIS Codes
(110.6960) Imaging systems : Tomography
(280.2490) Remote sensing and sensors : Flow diagnostics
(300.2140) Spectroscopy : Emission
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms
(300.6550) Spectroscopy : Spectroscopy, visible

Original Manuscript: January 30, 2001
Revised Manuscript: August 20, 2001
Published: January 1, 2002

John Howard, "Electro-optically modulated polarizing Fourier-transform spectrometer for plasma spectroscopy applications," Appl. Opt. 41, 197-208 (2002)

Sort:  Author  |  Year  |  Journal  |  Reset  


  1. J. Howard, “Modulated Optical Solid-State spectrometer applications in plasma diagnostics,” Rev. Sci. Instrum. 70, 368–371 (1999). [CrossRef]
  2. J. Howard, “Optical coherence-based techniques for motional Stark effect measurements of magnetic field pitch angle,” Plasma Phys. Controlled Fusion 41, 271–284 (1999). [CrossRef]
  3. S. Hamberger, B. Blackwell, L. Sharp, D. Shenton, “H-1 design and construction,” Fusion Technol. 17, 123–130 (1990).
  4. J. Howard, “Vector tomography applications in plasma diagnostics,” Plasma Phys. Controlled Fusion 38, 489–503 (1996). [CrossRef]
  5. R. Hilliard, G. Shepherd, “Upper atmosphere temperatures from Doppler line width,” Planet. Space Sci. 14, 386–406 (1966). [CrossRef]
  6. G. Thuillier, M. Hersé, “Thermally stable field compensated Michelson interferometer for measurement of temperature and wind of the planetary atmospheres,” Appl. Opt. 30, 1210–1220 (1991). [CrossRef] [PubMed]
  7. W. Gault, S. Brown, A. Moise, D. Liang, G. Sellar, G. Shepherd, J. Wimperis, “ERWIN: an E-region wind interferometer,” Appl. Opt. 35, 2913–2922 (1996). [CrossRef] [PubMed]
  8. R. S. Weiss, T. K. Gaylord, “Lithium niobate: summary of physical properties and crystal structure,” Appl. Phys. A 37, 191–203 (1985). [CrossRef]
  9. I. P. Kaminow, An Introduction to Electrooptic Devices (Academic, New York, 1974).
  10. A. P. Thorne, Spectrophysics (Chapman Hall, London, 1988). [CrossRef]
  11. W. Steel, Interferometry (Cambridge U. Press, Cambridge, UK, 1967).
  12. C. Michael, J. Howard, B. D. Blackwell, “The MOSS camera on H-1NF,” Rev. Sci. Instrum. 72, 1034–1037 (2001). [CrossRef]
  13. O. Sasaki, H. Okazaki, “Analysis of measurement accuracy in sinusoidal phase modulating interferometry,” Appl. Opt. 25, 3152–3158 (1986). [CrossRef] [PubMed]
  14. M. Shats, D. L. Rudakov, B. D. Blackwell, G. Borg, R. L. Dewar, J. Howard, L. Sharp, “Improved particle confinement mode in low-temperature plasma in H-1 heliac,” Phys. Rev. Lett. 77, 4190–4193 (1996). [CrossRef] [PubMed]

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited