Low‐Temperature Measurement of the Hypersonic Absorption in Fused Quartz by Stimulated Brillouin Scattering
作者:
W. Heinicke,
G. Winterling,
K. Dransfeld,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1971)
卷期:
Volume 49,
issue 3C
页码: 954-958
ISSN:0001-4966
年代: 1971
DOI:10.1121/1.1912455
出版商: Acoustical Society of America
数据来源: AIP
摘要:
By making use of stimulated Brillouin scattering, hypersonic absorption and velocity measurements in quartz glass were carried out at 24 GHz. Absorption data for longitudinal sound waves are presented below 8°K and velocity data between 4° and 300°K. The hypersonic absorption is observed to decrease strongly on cooling corresponding to a mean free path of the hypersonic phonons larger than 2 mm below 3.5°K. This value exceeds the mean free path calculated from heat conductivity data at 1.5°K for thermal phonons of similar energy by three orders of magnitude. The absorption data are discussed in connection with previous lower‐frequency measurements.
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