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为提高瞬态布里渊放大器的工作性能,利用包含噪声的瞬态布里渊放大理论模型数值模拟了放大器的信噪比、灵敏度、能量转换效率及信号放大率随指数增益系数G的变化规律,获得了放大器的最佳工作点G_(opt.)采用倍频Nd:YAG脉冲激光器,以CS_2和FC-72为非线性介质进行了实验验证.结果表明,抽运光脉冲相对于信号光脉冲延迟脉冲宽度的一半进入放大器时,G_(opt)可设在介质受激布里渊散射阈值增益G_(th)之上.对于共线型布里渊放大结构,G_(opt)为Gth的1.1—1.3倍;对于非共线型结构,G_(opt)可超过G_(th)1.3倍,实现近饱和放大.
In order to improve the working performance of the transient Brillouin amplifier, the signal-to-noise ratio, sensitivity, energy conversion efficiency and the variation rule of the signal amplification factor with the exponential gain coefficient G are numerically simulated by the theoretical model of transient Brillouin amplification with noise , The best operating point of the amplifier G_ (opt.) Was obtained by using a frequency doubled Nd: YAG pulsed laser with CS_2 and FC-72 as the nonlinear medium.The experimental results show that the pump pulse has a better performance than the signal pulse When half of the delay pulse width enters the amplifier, G opt can be set above the thresholded G th threshold of the stimulated Brillouin scattering. For the in-line Brillouin amplification, G opt is Gth 1.1 -1.3 times; for the non-collinear structure, G_ (opt) can exceed 1.3 times G_ (th), to achieve near-saturation amplification.