布里渊增强四波混频时域特性的理论研究

Theoretical study on temporal behavior of Brillouin-enhanced four-wave mixing

通过对布里渊增强四波混频(BEFWM)瞬态耦合波方程的数值求解,描述了共轭输出光的时域调制行为.同时,对能量耦合过程中起决定性作用的声学波的时空演化特征进行了模拟与分析,由此给出BEFWM时域特性物理机理的解释.研究表明,共轭光输出强度的波动与介质内声波场的分布和起伏相关联,共轭光波形调制现象的强弱取决于介质声子寿命、信号及抽运光强度、有效作用长度等诸多参数.

The nature of Brillouin-enhanced four-wave mixing （BEFWM） temporal modulating behavior is examined numerically. The evolution of the acoustic wave, which plays a key role in the process of energy inter-coupling, is simulated and analyzed. Based on this, the detailed mechanism of BEFWM temporal characteristics is explained. It is demonstrated that, modulations in the conjugate wave are related with the distribution and fluctuation of the acoustic wave, and influenced by parameters such as phonon lifetime, intensity of the signal and pump wave, effective interaction length, and so on.