光子晶格中超短脉冲光的时域特性  

Temporal Properties of Ultrashort Laser Pulses in Photonic Lattice by SHG-FROG Technique

作　　者：王喆[1,2,3] 唐柏权[1,3] 杨程亮[1,3] 金妮娜[1,3] 陈楠[1,3] 吴强[1,3] 

机构地区：[1]南开大学物理科学学院光子学中心,天津300071 [2]天津理工大学理学院,天津300384 [3]南开大学泰达应用物理学院弱光非线性光子学教育部重点实验室,天津300457

出　　处：《天津大学学报》2011年第8期747-752,共6页Journal of Tianjin University(Science and Technology)

基　　金：国家自然科学基金资助项目(10604033);天津市自然科学基金资助项目(09JCYBJC5100)

摘　　要：为定量分析光子晶格对超短脉冲的时域、频域和非线性动力学过程的操控作用,利用搭建的二次谐波型频率分辨光学开关探测系统对超短脉冲离散衍射的出射光进行了时频域的定量探测和分析.运用广义主元素投影算法从采集的频率分辨光学开关(FROG)迹线中定量恢复了时域电场、频域光谱以及它们的相位信息.通过对上述结果的数值拟合,获得了脉宽、谱宽、中心波长和各阶啁啾量,并结合上述结果分析了非线性相移与色散啁啾对光谱的影响和色散与自相位调制(SPM)对脉宽的影响.结果表明,光子晶格不但对入射光存在空间调控,同时也对脉冲光的时域、频域以及非线性过程有着全面、灵活的调控能力;传输中,脉冲光的脉宽和频谱之间的关系受传播系统的色散、非线性系数以及结构等诸多因素的共同制约.A second harmonic generation frequency-resolved optical gating （SHG-FROG）detection system was built for quantitatively analyzing the controlling of photonic lattice for ultrashort laser pulses in temporal and frequency domain and its nonlinear dynamic progress. The electric field in time domain, spectrum, and their phases were quantitatively retrieved by the principal component generalized projection algorithm （PCGPA） from the FROG traces. The pulse duration, bandwidth, center wavelength, and the chirp of first 5 orders were obtained by numerical fitting, based on which, the influence of nonlinear phase shift and chirp on spectrum and the influence of dispersion and selfphase modulation （SPM） on duration were discussed. Results show that photonic lattice can control not only an electric magnetic wave spatially but also its properties in temporal and frequency domain and nonlinear dynamic progress flexibly. In the propagation process, the relationship between duration and spectrum is governed by dispersion, nonlinear coefficient, structure, and some other factors of the propagating system.

关 键 词：飞秒脉冲 光子晶格 离散衍射 频率分辨光学开关 

分 类 号：O437.5[机械工程—光学工程]