Abstract
High-resolution stimulated Brillouin gain (SBG) spectroscopy has recently been demonstrated for gases,1 liquids,2 and optical glass.3 In this nonlinear optical experiment, two lasers are used to stimulate and probe hypersonic sound waves in the sample. As in stimulated Raman gain spectroscopy, the resolution is determined by the linewidths of the lasers employed. Our SBG apparatus2 employs low-power cw lasers in order to maximize resolution, and spectra with good signal-to-noise (limited by shot noise in the HeNe probe laser) are obtained through the use of balanced detection and double modulation. An external confocal etalon is used to linearize the frequency scans of our pump laser—a ring dye-laser—so that highly accurate measurements of Brillouin shifts can be made.
© 1992 Optical Society of America
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