聚焦型布里渊池受激散射脉冲的时间特性

Temporal Characteristics of Brillouin Back scattering Pulses from a Cell with Focus Geometry

对单个聚焦结构布里渊池后向散射（反射）脉冲时间特性开展实验研究，观测到相位共轭保真度的时域变化，并用两个布里渊池合成得到具有较高对比度的脉冲波形。结果表明：单池反射脉冲波形敏感地依赖于泵浦能量和聚焦参数。反射脉冲前沿被陡化和压缩，脉冲前沿起点时间随泵浦能量提高而提前，变化范围约为１．５ｎｓ。验证实验表明利用多个布里渊池实现脉冲时间整形方案在原理上是可行的。

The temporal characteristics of Brillouin back scattering pulses from a single cell with focus geometry were investigated experimentally. The temporal variation of the phase conjugation fidelity and the shaping pulse with high contrast using two cells were also observed. The results show that the profile of the reflected pulse is closely related to pump energy and focal length of the lens. The pulse start point is not stable and the variation is about 1.5 ns. The pulse shaping using a multi cell scheme is practicable in principle.