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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 17 — Sep. 1, 2014
  • pp: 5034–5037

Noise-immune cavity-enhanced optical frequency comb spectroscopy

Amir Khodabakhsh, Chadi Abd Alrahman, and Aleksandra Foltynowicz  »View Author Affiliations

Optics Letters, Vol. 39, Issue 17, pp. 5034-5037 (2014)

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We present a new method of optical frequency comb spectroscopy that combines cavity enhancement with frequency modulation to obtain immunity to laser frequency-to-amplitude noise conversion by the cavity modes and, thus, high absorption sensitivity over a broad spectral range. A frequency comb is locked to a cavity with a free spectral range (FSR) equal to 4/3 times the repetition rate of the laser, and phase-modulated at a frequency equal to the cavity FSR. The transmitted light is analyzed by a Fourier transform spectrometer with a high bandwidth detector. Phase-sensitive detection of the interferogram yields a noise-immune cavity-enhanced optical frequency comb spectroscopy (NICE-OFCS) signal. In the first demonstration, we record NICE-OFCS signals from the overtone CO2 band at 1575 nm with absorption sensitivity of 4.3×1010cm1Hz1/2 per spectral element, close to the shot noise limit.

© 2014 Optical Society of America

OCIS Codes
(300.1030) Spectroscopy : Absorption
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms
(300.6360) Spectroscopy : Spectroscopy, laser

ToC Category:

Original Manuscript: April 28, 2014
Revised Manuscript: June 20, 2014
Manuscript Accepted: July 6, 2014
Published: August 20, 2014

Amir Khodabakhsh, Chadi Abd Alrahman, and Aleksandra Foltynowicz, "Noise-immune cavity-enhanced optical frequency comb spectroscopy," Opt. Lett. 39, 5034-5037 (2014)

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