Abstract

Apparatus is described for the production of intense Brillouin spectra. The fine structure of the transverse scattered light (Rayleigh scattering) has been analyzed by means of a large Fabry and Perot etalon placed in the parallel beam of a high aperture glass spectrograph. Interferograms have been obtained of the Brillouin spectrum of acetone, ethyl alcohol, and water using λ4078 of Hg as the exciting line. Intensity measurements of these interference patterns show that the theory of Landau and Placzek is a very close approximation to the truth in the spectra investigated.

Polarization measurements have been made on these spectra excited by λ4358Hg by means of the method of Douglas and Rank. These polarization measurements show that ρs is small but not zero for the modified Brillouin components. The polarization of the unmodified Brillouin components seems to be somewhat less complete than that of the modified components. However the polarization measurements on the unmodified lines are vitiated by parasitic light and are not nearly as reliable as measurements on the modified lines.

© 1948 Optical Society of America

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