超短脉冲艾里光束的空间诱导群速度色散效应研究  

Spatially Induced Group Velocity Dispersion of Ultrashort Pulsed Airy Beams

作　　者：任志君[1,2] 范长江[1,2] 周卫东[1,2] 

机构地区：[1]浙江师范大学信息光学研究所,浙江金华321004 [2]浙江师范大学-浙江大学光学联合实验室,浙江杭州310027

出　　处：《中国激光》2011年第12期21-25,共5页Chinese Journal of Lasers

基　　金：浙江省高校重大科技攻关项目(ZD2009006);浙江省自然科学基金(Y1100524)资助课题

摘　　要：利用波动方程,研究了超短脉冲艾里(Airy)光束在自由空间传输时的空间诱导群速度色散(SIGVD)效应,并分析了影响SIGVD大小的因素。通过数值模拟,发现二阶SIGVD效应导致脉冲艾里光束在时域展宽,三阶SIGVD效应导致光束在时域出现非对称的拖尾振荡结构,这表明时域也为艾里分布的光束。因此,通过补偿二阶SIGVD效应,利用三阶SIGVD效应,即可在自由空间形成时-空域均为艾里分布的Airy-Airy-Airy光束。The spatially induced group velocity dispersion （SIGVD） of ultrashort pulsed Airy light beam propagating in free space is theoretically studied with wave equations. The factors influencing $IGVD are also analyzed. Moreover, the numerical simulation results confirm that the second-order SIGVD broadens the pulsed Airy beam in temporal domain~ and the third-order SIGVD brings the unsymmetrical temporal trailing oscillatory structure of beam, which is just the Airy beam in temporal domain. As a result, it can bring the Airy-Airy-Airy beam in free space, which is Airy distribution both in spatial and in temporal domain, by utilizing the third-order SIGVD on the condition of compensating the second-order SIGVD.

关 键 词：物理光学 色散 波传播 衍射 超快现象 

分 类 号：O436.3[机械工程—光学工程]