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Optics Letters

Optics Letters


  • 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)

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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

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

E. B. Cummings, "Laser-induced thermal acoustics: simple accurate gas measurements," Opt. Lett. 19, 1361-1363 (1994)

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  1. E. B. Cummings, GALCIT Rep. FM92-2 (California Institute of Technology, Pasadena, Calif., 1992).
  2. R. J. D. Miller, R. Casalegno, K. A. Nelson, M. D. Fayer, Chem. Phys. 72, 371 (1982). [CrossRef]
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  6. A. C. Eckbreth, Laser Diagnostics for Combustion Species and Temperature (Abacus,Cambridge, Mass., 1988), pp. 249–252.

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