Abstract

This investigation has examined the forward-scattered spectrum of the light from a giant-pulse ruby laser, which was focused into liquids to which absorbers were added. Anti-Stokes shifts of about one-half of the incident linewidth were observed, the same shift as that for back-scattered light. The shift has a small dependence upon the liquid used but does not depend upon the kind of absorber, or the amount of absorption above a critical value, and, except for the lowest powers used, is independent of incident laser power. It is found that almost all of the non-absorbed light is transmitted, but at the shifted frequency. The intense, shifted, forward-scattered light is explained as an interaction of the stimulated back-scattered light with the incident light which preferentially amplifies certain frequencies of the incident laser profile at the expense of the back-scattered light. It is concluded that forward scattering is an important technique for additional observations of stimulated thermal scattering.

© 1973 Optical Society of America

Some Stimulated Effects in Nonlinear Optics*

David H. Rank
J. Opt. Soc. Am. 60(4) 443-447 (1970)

Measurement of the stimulated thermal Rayleigh scattering instability

T. J. Karr, M. C. Rushford, J. R. Murray, and J. R. Morris
J. Opt. Soc. Am. B 8(5) 993-999 (1991)

Stimulated thermal Rayleigh scattering in optical fibers

Liang Dong
Opt. Express 21(3) 2642-2656 (2013)

Optical Mixing in Stimulated Brillouin Spectra*

T. A. Wiggins, R. V. Wick, N. D. Foltz, C. W. Cho, and D. H. Rank
J. Opt. Soc. Am. 57(5) 661-665 (1967)

Measurement of Rayleigh Scattering in Liquids Using Optical Fibers

J. Stone
Appl. Opt. 12(8) 1824-1827 (1973)