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High-resolution stimulated Brillouin gain spectroscopy in glasses and crystals

Journal Article · · Journal of the Optical Society of America, Part B: Optical Physics; (United States)
; ;  [1]
  1. Molecular Physics Laboratory, SRI International, Menlo Park, CA 94025 (United States)
Theory and measurements are presented for stimulated Brillouin gain spectroscopy in anisotropic media. The coupling between arbitrary pump and Stokes waves and the corresponding acoustic wave is formulated in terms of the elastic displacement vector and the photoelastic tensor. A propagation equation that fully includes transient effects is obtained for the Stokes wave. In the limit of small-signal gains this propagation equation can be solved analytically, yielding expressions that relate experimentally accessible quantities to material properties. Absolute Brillouin steady-state gain coefficients, linewidths, and frequency shifts are thereby determined in a number of optical materials at 532 nm. The Brillouin gain coefficient for fused silica is measured by three techniques, providing the reference for absolute gain measurements. Quantitative agreement is found between theory and experiment for transient effects on stimulated Brillouin scattering.
OSTI ID:
5642447
Journal Information:
Journal of the Optical Society of America, Part B: Optical Physics; (United States), Journal Name: Journal of the Optical Society of America, Part B: Optical Physics; (United States) Vol. 10:4; ISSN JOBPDE; ISSN 0740-3224
Country of Publication:
United States
Language:
English