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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 35, Iss. 8 — Apr. 15, 2010
  • pp: 1266–1268

Cavity-enhanced velocity modulation spectroscopy

Brian M. Siller, Andrew A. Mills, and Benjamin J. McCall  »View Author Affiliations

Optics Letters, Vol. 35, Issue 8, pp. 1266-1268 (2010)

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The spectroscopic study of molecular ions is of great importance to a variety of fields, but is challenging as ions are typically produced in plasmas containing many orders of magnitude more neutral molecules than ions. The successful technique of velocity modulation permits discrimination between ion and neutral absorption signals and has allowed the study of scores of molecular ions in the past quarter century. However, this technique has long been considered to be inappropriate for use with cavity-enhanced techniques, owing to the directional nature of the velocity modulation. Here we report what we believe to be the first demonstration of cavity-enhanced velocity modulation spectroscopy, utilizing a 2 f phase-sensitive demodulation scheme. This approach offers the promise of combining very high-sensitivity spectroscopic techniques with ion-neutral discrimination, which could extend the applicability of velocity modulation to intrinsically weak transitions and to ions that cannot be produced in high abundance. The use of a cavity also permits Lamb dip spectroscopy, which offers higher resolution and precision in frequency measurements and may be useful in measuring collisional rate coefficients.

© 2010 Optical Society of America

OCIS Codes
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(300.6360) Spectroscopy : Spectroscopy, laser
(300.6380) Spectroscopy : Spectroscopy, modulation
(300.6390) Spectroscopy : Spectroscopy, molecular
(300.6460) Spectroscopy : Spectroscopy, saturation
(350.5400) Other areas of optics : Plasmas

ToC Category:

Original Manuscript: January 6, 2010
Revised Manuscript: February 24, 2010
Manuscript Accepted: March 10, 2010
Published: April 15, 2010

Brian M. Siller, Andrew A. Mills, and Benjamin J. McCall, "Cavity-enhanced velocity modulation spectroscopy," Opt. Lett. 35, 1266-1268 (2010)

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