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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 28, Iss. 11 — Nov. 1, 2011
  • pp: 2797–2805

Reduction of background signals in fiber-based NICE-OHMS

Aleksandra Foltynowicz, Isak Silander, and Ove Axner  »View Author Affiliations


JOSA B, Vol. 28, Issue 11, pp. 2797-2805 (2011)
http://dx.doi.org/10.1364/JOSAB.28.002797


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Abstract

Noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) based on a fiber-coupled electro-optic modulator (EOM) provides a compact and versatile experimental setup. It has, however, been limited by background signals originating from an imbalance of the phase modulated triplet created by a cross-coupling between the principal axes of the polarization maintaining fibers and the extraordinary axis of the EOM. Two strategies for reducing these background signals are investigated: (i) using an EOM with a titanium diffused waveguide, in which the balance of the triplet is controlled by active feedback, and (ii) using an EOM with a proton exchanged waveguide that does not support light propagation along the ordinary axis. It is shown that both approaches significantly reduce drifts and noise in the system. Using a cavity with a finesse of 5700, an absorption sensitivity of 3.2 × 10 12 cm 1 in 1 min of integration time (i.e., 1.8 × 10 11 cm 1 Hz 1 / 2 ) is demonstrated for Doppler-broadened detection, the lowest reported so far for Doppler-broadened NICE-OHMS. For sub- Doppler detection, a minimum detectable optical phase shift of 1.3 × 10 12 cm 1 in 400 s of integration time is obtained.

© 2011 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(140.3510) Lasers and laser optics : Lasers, fiber
(300.1030) Spectroscopy : Absorption
(300.6310) Spectroscopy : Spectroscopy, heterodyne
(300.6380) Spectroscopy : Spectroscopy, modulation

ToC Category:
Spectroscopy

History
Original Manuscript: June 22, 2011
Manuscript Accepted: August 28, 2011
Published: October 27, 2011

Citation
Aleksandra Foltynowicz, Isak Silander, and Ove Axner, "Reduction of background signals in fiber-based NICE-OHMS," J. Opt. Soc. Am. B 28, 2797-2805 (2011)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-28-11-2797

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