【作者】 龚尚庆； 宋晓红； 李儒新； 徐至展；

【Author】 GONG Shangqing*, SONG Xiaohong, LI Ruxin, XU Zhizhan Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, China

【机构】 上海光学精密机械研究所；

【摘要】 周期量级超快超强激光技术的发展为探讨极端非线性光学条件下量子相干控制的研究提供了强有力的手段。在飞秒量级下研究相干控制光谱特性已成为当前一个新的研究前沿。本文采用有限时域差分方法,在没有采用旋波近似和慢变振幅近似的情况下,通过解Maxwell-Bloch方程数值模拟了二能级介质中周期量级双色场相干控制光谱效应。结果表明:由于双色场的相干效应,即使对于比较小的脉冲面积,透射光谱中也会有高频成分产生。而且,通过对ω-2ω和ω-3ω的比较我们发现由于两种电场组合的叠加形式不同,透射光谱也会有明显的差别。更多还原

【Abstract】 Using the numerical solutions of full Maxwell-Bloch equation, we investigate the two-color interference effects for ultrashort laser pulses propagating in a two-level medium. It is found that the interference effects of the two laser pulses can substantially modify the behavior of the spectra and propagation features: higher spectral components can be produced even for small pulse areas due to the interference effects of the two laser pulses. Moreover, through comparing the ω-2ω combination with the ω-3ω scenario, we find that the spectra effects are quite different due to the different due to the different superposition effects of the two kinds of combinations.更多还原