High-gain amplification of weak Stokes signal of stimulated Brillouin scattering in water
High-gain amplification of weak Stokes signal of stimulated Brillouin scattering in water
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DOI：
10.7498/aps.57.2248
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发表时间：
2008-04
期刊：
影响因子：
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通讯作者：
Gao Wei;L. Zhi-Wei;He Wei-ming;Dong Yongkang
中科院分区：
文献类型：
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作者：
Gao Wei;L. Zhi-Wei;He Wei-ming;Dong Yongkang
The influences of the delay time, the cell length and the pump energy on the gain amplification of weak Stokes signal of stimulated Brillouin scattering (SBS) in water are investigated theoretically and experimentally. In the experiment a frequency-doubled seed injection Nd:YAG laser with a pulse duration of 7.2 ns was used. Results showed that the pump pulse should lag the Stokes signal pulse by an amount equal to pulse half-width to obtain the maximum gain. Depending on the pump energy the signal below 10 -5 mJ is linearly amplified. By using CS 2 as amplifier medium, a Stokes signal of 1pJ from water is amplified with high gain (7×10 7 ) in the regime below the pump's self-SBS threshold.
