锥形镀膜光纤探针中飞秒激光脉冲的传输  

Propagation of femtosecond laser pulses through metal-coated tapered fibre probe

作　　者：刘桂媛[1,2] 滕树云[1] 程传福[1] 宋洪胜[1,2] 刘曼[1,3] 

机构地区：[1]山东师范大学物理与电子科学学院,济南250014 [2]山东建筑大学理学院,济南250101 [3]山东轻工业学院数理学院,济南250353

出　　处：《物理学报》2009年第11期7613-7620,共8页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(973)项目(批准号:2006CB806003);国家自然科学基金(批准号:10674085;10874105);山东省科技攻关项目(批准号:2009GG10001005);山东省优秀中青年科学家科研奖励基金(批准号2007BS04031)资助的课题~~

摘　　要：采用三维时域有限差分法对飞秒激光脉冲照明下锥形镀膜光纤探针内的光场进行了计算,研究了飞秒脉冲在探针中传输时的时域、频谱和相位特性,并分析了不同锥角和不同长度的探针对这些特性的影响.研究结果发现飞秒脉冲在探针中传输时出现了脉冲展宽、幅值振荡以及频谱分裂等现象,并且利用频谱和相位的变化特性初步解释了脉冲的展宽和脉冲振幅随时间周期性变化等现象.Using the three-dimensional finite difference time domain （3D-FDTD） method, we calculate light field in metal-coated optical fiber probes with different taper angles and different lengths under illumination of femtosecond laser pulses. The transmission of temporal fields of the laser pulses propagating in the probes and the properties of their frequency spectrum and phases are studied. The influences of the taper angle and the length of the probe on these properties are analyzed. The calculation results show that the structure of probe leads to the broadening, amplitude oscillation and the spectrum splitting of the laser pulses. With the analysis of the spectrum and the phase variation, we give a preliminary explanation to the phenomena of the pulse broadening and the periodic variation of the pulse amplitude with time.

关 键 词：时域有限差分法 飞秒脉冲 光纤探针 

分 类 号：TN24[电子电信—物理电子学] TH742[机械工程—光学工程]