两个耦合六波混频信号特性

The characteristics of two signals from coupled six-wave mixings

宽波长范围内双波长信号和多波长光信号的产生和控制在超快光学开关和相干控制研究中有着及其重要的意义.采用宽带宽的光脉冲在铷原子蒸汽中产生两个红外波段不同波长的光信号,观察到两个红外光信号间存在竞争.研究了泵浦激光强度、光脉冲啁啾和铷原子数密度对两个红外光信号特性的影响.结果表明,两个红外光信号的产生机制是两个耦合的参量六波混频过程;信号的强度随泵浦激光强度、光脉冲啁啾和铷原子数密度发生变化,两个红外光信号间的竞争主要由与铷原子数密度相关的相位匹配条件所决定.

Generation and control of optical signals in a wide wavelength range is of significant importance in optical gates and coherent control.Optical signals of two different wavelengths in the IR regime were generated in atomic Rb vapor using broad bandwidth laser pulses,and competition between the two signals was observed.The effects of pump laser intensity,chirp of laser pulses and Rb number density on the characteristics of the two signals were investigated.The results show that the two signals were generated from two coupled parametric sixwave mixing processes,and the signals vary with pump laser intensity,chirp of pump laser pulses and Rb number density.Moreover,the competition between the two signals was dominantly governed by phase matching conditions closely related to Rb number density.