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High-resolution low-level Brillouin spectroscopy in solids

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2 Author(s)
Durand, G. ; Gordon McKay Lab., Harvard Univ., Cambridge, Mass. ; Pine, A.

In this paper some of the experimental considerations for obtaining phonon attenuation in solids by Brillouin scattering are described. Measurements of room temperature damping of longitudinal hypersonic waves in α-quartz, fused silica, and calcium fluoride are reported. The observed phonon frequency and linewidth for backward scattering of 6328-Å light in these solids is typically ∼ 30 GHz and ∼ 30 MHz (FWHM), respectively. This corresponds to a damping length of \sim 60 \mu , which is inaccessible by conventional ultrasonics techniques.

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Quantum Electronics, IEEE Journal of  (Volume:4 ,  Issue: 9 )