摘要
本文在光脉冲近似为双曲正割函数下，运用有限傅里叶变换法（ＦＦＴ）对飞秒脉冲二次谐波自相关测量系统中主要由倍频晶体引起的三阶色散效应进行了数值计算和分析．指出当光脉冲的半高宽（ＦＷＨＭ）接近或小于１０ｆｓ时，脉冲才有明显的展宽效应，脉冲的展宽倍数与晶体的长度成递增关系，脉冲的前沿也出现了弛豫振荡结构的畸变现象，计算同时给出能基本消除三阶色散的展宽效应的倍频晶体的最大厚度。
The fast fourier transform
method is used to analyze third order dispersion (TOD) in an interferometer autocorrelation
measurement system Under the assumption of a sech 2 input pulse,TOD is significant only for
pulse widths less than 10 femtoseconds resulting in pulse broadening as well as distinct
amplitude oscillations on the leading/trailing edge TOD is found to be primarily due to the
frequency doubling crystal,being positively correlated with its length The calculations
presented here allow for the determination,given a knowledge of the approximate width of the
input pulse width,of the maximum thickness of crystal that may be used in the autocorrelation
system The influence of TOD in the frequency domain is also discussed
出处
《光子学报》
EI
CAS
CSCD
1999年第4期306-309,共4页
Acta Photonica Sinica
