Effect of water temperature on pulse duration and energy of stimulated Brillouin scattering

The water temperature has a strong effect on the kinematic viscosity, which is inversely proportional to the phonon lifetime and the gain coefficient. The higher the temperature is, the smaller the kinematic viscosity is, and the larger the phonon lifetime is. At a low pump power and a short focal l...

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Published inChinese physics B Vol. 22; no. 7; pp. 223 - 225
Main Author 张磊 张东 李金增
Format Journal Article
LanguageEnglish
Published 01.07.2013
Subjects
Brillouin zone
Coefficients
Gain
Kinematics
Phonons
Pulse duration
SBS
Scattering
Viscosity
Water temperature
受激布里渊散射
增益系数
水温
温度
能量变化
脉冲持续时间
运动粘度
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Summary:The water temperature has a strong effect on the kinematic viscosity, which is inversely proportional to the phonon lifetime and the gain coefficient. The higher the temperature is, the smaller the kinematic viscosity is, and the larger the phonon lifetime is. At a low pump power and a short focal length, we can derive a single-peak stimulated Brillouin scattering （SBS） pulse. The duration of this single-peak SBS pulse depends mainly on the phonon lifetime of water. With the increase of the water temperature, the duration of such a single-peak SBS pulse will become longer, and the SBS energy will become higher for the gain coefficient, which is related to the phonon lifetime. Therefore, varying the medium temperature can lead to the changes of SBS pulse duration and SBS energy.
Bibliography:The water temperature has a strong effect on the kinematic viscosity, which is inversely proportional to the phonon lifetime and the gain coefficient. The higher the temperature is, the smaller the kinematic viscosity is, and the larger the phonon lifetime is. At a low pump power and a short focal length, we can derive a single-peak stimulated Brillouin scattering （SBS） pulse. The duration of this single-peak SBS pulse depends mainly on the phonon lifetime of water. With the increase of the water temperature, the duration of such a single-peak SBS pulse will become longer, and the SBS energy will become higher for the gain coefficient, which is related to the phonon lifetime. Therefore, varying the medium temperature can lead to the changes of SBS pulse duration and SBS energy.
Zhang Lei, Zhang Dong, and Li Jin-Zeng a） National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China b） Shanghai Institute of Measurement and Testing Technology, Shanghai 201203, China
stimulated Brillouin scattering;pulse duration and energy;water temperature;phonon lifetime
11-5639/O4
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/22/7/074207