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Optics Letters

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  • Vol. 19, Iss. 17 — Sep. 1, 1994
  • pp: 1361–1363

Laser-induced thermal acoustics: simple accurate gas measurements

E. B. Cummings  »View Author Affiliations


Optics Letters, Vol. 19, Issue 17, pp. 1361-1363 (1994)
http://dx.doi.org/10.1364/OL.19.001361


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Abstract

Laser-induced thermal acoustics (LITA), an optical four-wave mixing technique, has been used for sensitive measurement of the sound speed, thermal diffusivity, acoustic damping rate, and complex susceptibility of a gas. In LITA, laser-induced acoustic waves scatter laser light into a coherent, modulated signal beam. A simple expression accurately describes the signal. Atmospheric sound speeds accurate to 0.5% and transport properties accurate to 30% have been measured in a single shot without calibration. LITA spectra have been taken of weak spectral lines of NO2 in concentrations of less than 50 parts in 109. Signal reflectivities up to 10−4 are estimated.

© 1994 Optical Society of America

History
Original Manuscript: February 17, 1994
Published: September 1, 1994

Citation
E. B. Cummings, "Laser-induced thermal acoustics: simple accurate gas measurements," Opt. Lett. 19, 1361-1363 (1994)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-19-17-1361

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