Amplification of weak Stokes signals in the transient regime of stimulated Brillouin scattering
Amplification of weak Stokes signals in the transient regime of stimulated Brillouin scattering
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DOI：
10.1007/s10946-005-0001-9
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发表时间：
2005
影响因子：
0.9
通讯作者：
I. Bel'dyugin;V. F. Efimkov;S. I. Mikhailov;I. Zubarev
中科院分区：
文献类型：
--
作者：
I. Bel'dyugin;V. F. Efimkov;S. I. Mikhailov;I. Zubarev
从实验和理论两方面研究了微弱信号的放大。理论分析是在一个预定的泵浦场的近似下进行的，并考虑了相互作用脉冲的时间结构（不饱和状态）。当泵浦脉冲宽度为超声波声子寿命的量级时，在大增益模式下输出斯托克斯信号的宽度仅比泵浦脉冲的宽度小一半。为了获得最大增益，泵浦脉冲相对于输入斯托克斯脉冲应延迟超声波声子寿命数量级的时间间隔。在输入信号能量为10- 11 J量级时，实验获得了102·109的能量增益。
Amplification of weak signals was investigated both experimentally and theoretically. The theoretical analysis was carried out within the approximation of a predetermined pumping field with consideration for temporal structures of the interacting pulses (unsaturated regime). With a pumping pulse duration of the order of the lifetime of hyperacoustic phonons, the width of the output Stokes signal in the large-gain mode was shown to be less than that of the pumping pulse by only half. To achieve the maximum gain, the pumping pulse should be delayed with respect to the input Stokes pulse by a time interval of the order of the lifetime of hyperacoustic phonons. Energy gains ∼2 · 109were experimentally achieved with an input signal energy of the order of 10-11J.