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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 7 — Mar. 1, 2008
  • pp: 901–907

Gain analysis of an optical multipass cell for spectroscopic measurements in luminous environments

Gregor A. Waldherr and Hai Lin  »View Author Affiliations

Applied Optics, Vol. 47, Issue 7, pp. 901-907 (2008)

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The signal improvement obtained for a spectroscopic measurement with a multipass cell can be expressed as the gain over a single pass measurement. We develop a unified analysis of amplitude gain and signal-to-noise ratio (SNR) gain for both cw and pulsed systems with application to Rayleigh/Raman spectroscopy, fluorescence, and similar techniques. Our analysis reveals that the SNR gain is dependent on the single pass efficiency, number of passes, and temporal overlap. Increasing the single pass efficiency of a multipass system will increase both the amplitude and SNR gains. While increasing the number of passes always improves the amplitude gain, the SNR gain actually has an optimal number of passes. In particular, what has not been recognized for pulsed systems is that increasing the pulse overlap fraction is equally or even more significant than the number of pass or efficiency increases. For cw systems, the amplitude gain and SNR gain are identical.

© 2008 Optical Society of America

OCIS Codes
(220.4830) Optical design and fabrication : Systems design
(230.4040) Optical devices : Mirrors
(300.0300) Spectroscopy : Spectroscopy

ToC Category:

Original Manuscript: April 11, 2007
Revised Manuscript: December 13, 2007
Manuscript Accepted: January 11, 2008
Published: February 28, 2008

Gregor A. Waldherr and Hai Lin, "Gain analysis of an optical multipass cell for spectroscopic measurements in luminous environments," Appl. Opt. 47, 901-907 (2008)

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  1. R. A. Hill and D. L. Hartley, “Focused, multiple-pass cell for Raman scattering,” Appl. Opt. 13, 186-192 (1974). [CrossRef] [PubMed]
  2. A. J. Mulac, W. L. Flower, R. A. Hill, and D. P. Aeschliman, “Pulsed spontaneous Raman scattering technique for luminous environments,” Appl. Opt. 17, 2695-2699 (1978). [CrossRef] [PubMed]
  3. J. U. White, “Long optical paths of large aperture,” J. Opt. Soc. Am. 32, 285-288 (1942). [CrossRef]
  4. W. T. Hill III, F. A. Abreu, T. W. Hänsch, and A. L. Schawlow, “Sensitive intracavity absorption of reduced pressures,” Opt. Commun. 32, 96-100 (1980). [CrossRef]
  5. W. Demtroder, Laser Spectroscopy: Basic Concepts and Instrumentation (Springer-Verlag, 1981).
  6. D. A. Santavicca, “A high energy, long pulse Nd:YAG laser multipass cell for Raman scattering diagnostics,” Opt. Commun. 30, 423-425 (1979). [CrossRef]
  7. A. C. Eckbreth, Laser Diagnostics for Combustion Temperature and Species (Abacus Press, 1988).
  8. A. Gulati, “Raman measurements at the exit of a combustor sector,” J. Propul. Power 10, 169-175 (1994). [CrossRef]

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