少周期脉冲激光在稠密的Λ型三能级原子介质中传播时的频谱分析

马慧; 宋强

光子学报, 2011, 40 (1): 24, 网络出版: 2011-03-08

少周期脉冲激光在稠密的Λ型三能级原子介质中传播时的频谱分析

Spectrum Analysis of a Few-cycle Laser Pulse Propagating in a Dense Λ-type Three-level Atomic Medium

论文大纲

马慧 ^1,*宋强 ²

作者单位

¹ 山东轻工业学院数理学院，济南 250353

² 山东师范大学研究生学院，济南 250014

近偶极—偶极相互作用自相位调制超连续光谱 Near dipole-dipole interaction Self-phase modulation Supercontinuum spectrum

摘要

利用由预估校正法和时域有限差分法求解全波Maxwell—Bloch方程得到的数值解，研究了超短脉冲激光在稠密的三能级原子系统中的频谱演化规律.研究发现：不管是在稀疏介质中还是在稠密介质中，由于自相位调制作用，频谱均被展宽，而在稠密介质中频谱的宽度要远大于稀疏介质中的情况，这主要是由于近偶极—偶极作用导致的.在稠密介质中，由于近偶极—偶极作用和自相位调制作用，频谱出现高频连续波，可以得到覆盖频率范围为10 ωp的超连续谱.

Abstract

Full Maxwell-Bloch equations were solved by Predictor-Corrector method and finite- difference time-domain method to investigate spectrum of a sub-cycle laser pulse propagating in a dense Λ-type three-level atomic medium.It is found that both in a dilute medium and a dense medium,the spectrum is broaden due to the self-phase modulation(SPM); however,the width is much larger in the dense medium than that in a dilute medium because of NDD interaction.In the dense medium,the supercontinuum spectrum occurs due to SPM and NDD interaction,and the maximum frequency is 10 ωp.

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马慧, 宋强. 少周期脉冲激光在稠密的Λ型三能级原子介质中传播时的频谱分析[J]. 光子学报, 2011, 40(1): 24. MA Hui, SONG Qiang. Spectrum Analysis of a Few-cycle Laser Pulse Propagating in a Dense Λ-type Three-level Atomic Medium[J]. ACTA PHOTONICA SINICA, 2011, 40(1): 24.

少周期脉冲激光在稠密的Λ型三能级原子介质中传播时的频谱分析

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