Effects of spectral linewidth of ultrashort pulses on the spa-tiotemporal distribution of diffraction fields  

作　　者：Jingzhou Xu Li Wang Guozhen Yang 

机构地区：[1]Chinese Acad Sci, Lab Opt Phys, Inst Phys, Beijing 100080, Peoples R China

出　　处：《Chinese Science Bulletin》2001年第11期901-904,共4页

基　　金：the National NaturalScience Foundation of China (Grant No. 39890390) and the State Key Basic Research and Development Program (Grant No. G1998010102).

摘　　要：The spatiotemporal characteristics of electromagnetic pulses with ultrabroad spectral bandwidth in the far field are analyzed by using classical scalar diffraction theory. The effects of the ratio of the frequency width to the central frequency on the diffraction spatial distribution are discussed. It is concluded that the diffraction spatial distribution of the pulsed radiation gets narrower than a monochromatic wave when the frequency width of the pulse is comparable to or larger than its central frequency.The spatiotemporal characteristics of electromagnetic pulses with ultrabroad spectral bandwidth in the far field are analyzed by using classical scalar diffraction theory. The effects of the ratio of the frequency width to the central frequency on the diffraction spatial distribution are discussed. It is concluded that the diffraction spatial distribution of the pulsed radiation gets narrower than a monochromatic wave when the frequency width of the pulse is comparable to or larger than its central frequency.

关 键 词：PULSE PROPAGATION DIFFRACTION ultrabroad frequency BANDWIDTH THZ radiation. 

分 类 号：O436.1[机械工程—光学工程]