摘要
本文给出了光栅在超短脉冲照射下其瞬时 Fresnel衍射光场的解析解 .对该解析解的数值计算表明 :当脉冲光波的半极大值全宽 Δτ在几十个 fs内 ,光栅的瞬时 Talbot自成象现象消失 ,且 Δτ越小或距离越远 ,瞬时光强波形与初始波形差异较大 .而当 Δτ达到 ps的数值级时 ,瞬时
An analytical expression is given to study the temporal Fresnel diffraction field of a grating illuminated by an ultrashort pulsed-laser beam.Numerical calculation shows that for the width of the input pulse Δτ within a few decade femtoseconds,the temporal Talbot self-imaging effect disappears.Furthermore,the smaller the width of the input pulse Δτ,and/or the longer the distance z ,the more the difference between the outline of the temporal intensity to that of the input pulse.However,for Δτ within a few thousand femtoseconds,the temporal Talbot self-imaging effect exists.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2002年第2期152-156,共5页
Acta Photonica Sinica
基金
国家自然科学基金
中国科学院百人计划
上海应用物理中心资助项目
