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

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  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]
  3. M. Buntine, D. Chandler, C. Hayden, “Detection of excited-state absorption in water via laser-induced grating spectroscopy,” J. Chem. Phys. (to be published).
  4. R. W. Boyd, Nonlinear Optics (Academic, New York, 1992), Chap. 8, pp. 327–331.
  5. B. J. Berne, R. Pecora, Dynamic Light Scattering (Wiley, New York, 1976), Chap. 10, pp. 229–232.
  6. A. C. Eckbreth, Laser Diagnostics for Combustion Species and Temperature (Abacus,Cambridge, Mass., 1988), pp. 249–252.

1992 (1)

R. W. Boyd, Nonlinear Optics (Academic, New York, 1992), Chap. 8, pp. 327–331.

1982 (1)

R. J. D. Miller, R. Casalegno, K. A. Nelson, M. D. Fayer, Chem. Phys. 72, 371 (1982).
[CrossRef]

Berne, B. J.

B. J. Berne, R. Pecora, Dynamic Light Scattering (Wiley, New York, 1976), Chap. 10, pp. 229–232.

Boyd, R. W.

R. W. Boyd, Nonlinear Optics (Academic, New York, 1992), Chap. 8, pp. 327–331.

Buntine, M.

M. Buntine, D. Chandler, C. Hayden, “Detection of excited-state absorption in water via laser-induced grating spectroscopy,” J. Chem. Phys. (to be published).

Casalegno, R.

R. J. D. Miller, R. Casalegno, K. A. Nelson, M. D. Fayer, Chem. Phys. 72, 371 (1982).
[CrossRef]

Chandler, D.

M. Buntine, D. Chandler, C. Hayden, “Detection of excited-state absorption in water via laser-induced grating spectroscopy,” J. Chem. Phys. (to be published).

Cummings, E. B.

E. B. Cummings, GALCIT Rep. FM92-2 (California Institute of Technology, Pasadena, Calif., 1992).

Eckbreth, A. C.

A. C. Eckbreth, Laser Diagnostics for Combustion Species and Temperature (Abacus,Cambridge, Mass., 1988), pp. 249–252.

Fayer, M. D.

R. J. D. Miller, R. Casalegno, K. A. Nelson, M. D. Fayer, Chem. Phys. 72, 371 (1982).
[CrossRef]

Hayden, C.

M. Buntine, D. Chandler, C. Hayden, “Detection of excited-state absorption in water via laser-induced grating spectroscopy,” J. Chem. Phys. (to be published).

Miller, R. J. D.

R. J. D. Miller, R. Casalegno, K. A. Nelson, M. D. Fayer, Chem. Phys. 72, 371 (1982).
[CrossRef]

Nelson, K. A.

R. J. D. Miller, R. Casalegno, K. A. Nelson, M. D. Fayer, Chem. Phys. 72, 371 (1982).
[CrossRef]

Pecora, R.

B. J. Berne, R. Pecora, Dynamic Light Scattering (Wiley, New York, 1976), Chap. 10, pp. 229–232.

Chem. Phys. (1)

R. J. D. Miller, R. Casalegno, K. A. Nelson, M. D. Fayer, Chem. Phys. 72, 371 (1982).
[CrossRef]

Nonlinear Optics (1)

R. W. Boyd, Nonlinear Optics (Academic, New York, 1992), Chap. 8, pp. 327–331.

Other (4)

B. J. Berne, R. Pecora, Dynamic Light Scattering (Wiley, New York, 1976), Chap. 10, pp. 229–232.

A. C. Eckbreth, Laser Diagnostics for Combustion Species and Temperature (Abacus,Cambridge, Mass., 1988), pp. 249–252.

M. Buntine, D. Chandler, C. Hayden, “Detection of excited-state absorption in water via laser-induced grating spectroscopy,” J. Chem. Phys. (to be published).

E. B. Cummings, GALCIT Rep. FM92-2 (California Institute of Technology, Pasadena, Calif., 1992).

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (4)

Fig. 1
Fig. 1

LITA experimental setup: f.l., focal length; BPF, bandpass filter.

Fig. 2
Fig. 2

Nonresonant (dotted curve), near-resonant (dashed curve), and resonant LITA (solid curve) signals.

Fig. 3
Fig. 3

Single-shot signal from NO2-seeded air obtained with a grating wavelength of 32.3 μm.

Fig. 4
Fig. 4

Four-shot average signal from seeded air obtained with a grating wavelength of 14.5 μm and theoretical fit (dashed curve).

Equations (1)

Equations on this page are rendered with MathJax. Learn more.

I ( t ) [ A exp ( - D T q 2 t ) + B cos ( c s q t + Φ ) exp ( - Γ q 2 t ) ] 2 ,

Metrics