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Optics Letters

Optics Letters


  • 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)

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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 CO 2 and C 2 H 2 diluted in nitrogen. A 7.3 × 10 8 cm 1 W / ( 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:

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

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)

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