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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 35, Iss. 21 — Nov. 1, 2010
  • pp: 3571–3573

Resonant optothermoacoustic detection: technique for measuring weak optical absorption by gases and micro-objects

Anatoliy A. Kosterev and James H. Doty, III  »View Author Affiliations


Optics Letters, Vol. 35, Issue 21, pp. 3571-3573 (2010)
http://dx.doi.org/10.1364/OL.35.003571


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Abstract

We report a laser spectroscopy technique for detecting optical absorption in gases and micro-objects via linked thermal effects and by using a sharp mechanical resonance in a quartz crystal. The performance of this technique is studied using near-IR diode lasers and two gases, pure CO2 and C2H2 diluted in nitrogen. A 7.3×10−8cm−1W/(Hz)1/2 noise equivalent sensitivity to absorption in gases is demonstrated. Based on experimental results, it was estimated that 10−8 fractional absorption of optical radiation by a micro-object deposited on a thin transparent fiber can be detected.

© 2010 Optical Society of America

OCIS Codes
(280.3420) Remote sensing and sensors : Laser sensors
(300.6360) Spectroscopy : Spectroscopy, laser

ToC Category:
Spectroscopy

History
Original Manuscript: August 30, 2010
Manuscript Accepted: September 28, 2010
Published: October 21, 2010

Citation
Anatoliy A. Kosterev and James H. Doty, III, "Resonant optothermoacoustic detection: technique for measuring weak optical absorption by gases and micro-objects," Opt. Lett. 35, 3571-3573 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-21-3571

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