2008/03/06 by A. Devos, Marie Foret, M. Foret +5 · 1 citation
Earth and Planetary Sciences · Engineering · Physics and Astronomy · #Photoacoustic and Ultrasonic Imaging #Random lasers and scattering media #Seismic Waves and Analysis #cond-mat.dis-nn #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.77.100201
4 pages, 3 figures
arxiv created 2008/03/06 · openalex publication_date 2008/03/27 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The attenuation of longitudinal acoustic phonons up to frequencies nearing 250\phantom\rule0.3em0exGHz is measured in vitreous silica with a picosecond optical technique. By taking advantage of interferences on the probe beam, difficulties encountered in early pioneering experiments are alleviated. Sound damping at 250\phantom\rule0.3em0exGHz and room temperature is consistent with relaxation dominated by anharmonic interactions with the thermal bath, extending optical Brillouin scattering data. Our result is at variance with claims of a recent deep-UV experiment which reported a rapid damping increase beyond 100\phantom\rule0.3em0exGHz. A comprehensive picture of the frequency dependence of sound attenuation in v\text\ensuremath-SiO2 can be proposed.