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对于窄脉冲激光泵浦双池受激布里渊散射(SBS)系统,其泵浦脉冲宽度和前沿形状以及振放双池系统的参数,都将影响到SBS的脉冲强度与转换效率。实验中采用了两个具有不同前沿的窄脉冲先后相继泵浦双池SBS系统。通过改变SBS放大池和聚焦透镜的焦距,观察到所产生的两个SBS脉冲具有不同的转换效率。利用振荡池产生的SBS调制种子光在放大池中的行波放大对此结果作了分析,由此提供了一种设计双池SBS系统参数的方法。
For a narrow-pulse laser-pumped double-cell SBS system, the pulse width and leading edge shape of the pump and the parameters of the dual-cell system are all affected by the SBS pulse intensity and conversion efficiency. In the experiment, two narrow pulses with different fronts were used to sequentially pump two-cell SBS system. By changing the focal length of the SBS magnification cell and the focusing lens, it was observed that the resulting two SBS pulses had different conversion efficiencies. The results were analyzed using the traveling wave amplification of the SBS modulated seed light generated by the oscillating cell in the amplifier cell, thereby providing a method for designing the parameters of the dual cell SBS system.