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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 34, Iss. 18 — Jun. 20, 1995
  • pp: 3290–3302

Laser-induced thermal acoustics (LITA) signals from finite beams

E. B. Cummings, I. A. Leyva, and H. G. Hornung  »View Author Affiliations


Applied Optics, Vol. 34, Issue 18, pp. 3290-3302 (1995)
http://dx.doi.org/10.1364/AO.34.003290


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Abstract

Laser-induced thermal acoustics (LITA) is a four-wave mixing technique that may be employed to measure sound speeds, transport properties, velocities, and susceptibilities of fluids. It is particularly effective in high-pressure gases (>1 bar). An analytical expression for LITA signals is derived by the use of linearized equations of hydrodynamics and light scattering. This analysis, which includes full finite-beam-size effects and the optoacoustic effects of thermalization and electrostriction, predicts the amplitude and the time history of narrow-band time-resolved LITA and broadband spectrally resolved (mulitplex) LITA signals. The time behavior of the detected LITA signal depends significantly on the detection solid angle, with implications for the measurement of diffusivities by the use of LITA and the proper physical picture of LITA scattering. This and other elements of the physics of LITA that emerge from the analysis are discussed. Theoretical signals are compared with experimental LITA data.

© 1995 Optical Society of America

History
Original Manuscript: August 19, 1994
Revised Manuscript: December 5, 1994
Published: June 20, 1995

Citation
E. B. Cummings, I. A. Leyva, and H. G. Hornung, "Laser-induced thermal acoustics (LITA) signals from finite beams," Appl. Opt. 34, 3290-3302 (1995)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-34-18-3290


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References

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