对初始相位依赖的超短脉冲在极性介质中的传播

CARRIER-ENVELOP PHASE DEPENDENCE OF ULTRASHORT PULSE PROPAGATION IN A POLAR MOLECULE

在不采用旋波近似和慢变幅近似条件下,用时域有限差分法和预估计矫正法求解Maxwell-Block方程,理论上研究了对初始相位依赖的超短脉冲激光在极性介质中的传播.结果表明,在双光子共振传播过程中会产生极短的单极半周期脉冲,而且单极半周期脉冲的方向和个数强烈的依赖入射脉冲的初始相位和介质的固有偶极矩,这样可以根据产生的孤子脉冲的性质从光信号中提取脉冲初始相位信息.

The cartier is theoretically investigated - envelop phase （CEP） dependence of ultrashort pulse propagation in a polar molecule by numerically solving the full -wave Maxwell -Bloch equations with an iterative predictor- corrector finite - difference time - domain （FDTD） technique in the femtosecond time domain. Interestingly, it is shown that unipolar halfcycle pulses can be generated when a few cycle ultrashort pulses is propagated in asymmetric media. Since the direction and number of half - cycle solitons depends sensitively on the CEP thus provides a useful approach to determine the CEP information of the incident pulse.