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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 38, Iss. 22 — Nov. 15, 2013
  • pp: 4625–4628

Two-tone frequency-modulation spectroscopy in off-axis cavity

P. Malara, M. F. Witinski, G. Gagliardi, and P. De Natale  »View Author Affiliations


Optics Letters, Vol. 38, Issue 22, pp. 4625-4628 (2013)
http://dx.doi.org/10.1364/OL.38.004625


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Abstract

As opposed to a conventional optical resonator, an off-axis-aligned cavity is able to transmit without distortion radiation modulated at a frequency even far above the cavity bandpass. This allows us to implement a simple spectroscopic technique that combines the cavity path-length enhancement of integrated cavity output spectroscopy (ICOS) and the noise reduction associated with radio-frequency modulation (FM). An FM-ICOS spectrometer is demonstrated for the first time using a two-tone modulation technique. The performance is compared to the traditional ICOS by examining the acetylene absorption at 1543.77 nm. A signal-to-noise ratio improvement by a factor 3.5 is found with our proof-of-concept setup. Larger improvements are expected in a more optimized setup.

© 2013 Optical Society of America

OCIS Codes
(140.4780) Lasers and laser optics : Optical resonators
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6310) Spectroscopy : Spectroscopy, heterodyne
(300.6380) Spectroscopy : Spectroscopy, modulation
(300.6390) Spectroscopy : Spectroscopy, molecular

ToC Category:
Spectroscopy

History
Original Manuscript: July 29, 2013
Revised Manuscript: September 25, 2013
Manuscript Accepted: October 7, 2013
Published: November 6, 2013

Citation
P. Malara, M. F. Witinski, G. Gagliardi, and P. De Natale, "Two-tone frequency-modulation spectroscopy in off-axis cavity," Opt. Lett. 38, 4625-4628 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-22-4625

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