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.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
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~~
关键词
时域有限差分法
飞秒脉冲
光纤探针
finite difference time domain method
femtosecond laser pulses
fiber probe