Isolated attosecond pulse generation combining propagation effects and a modulated chirped polarization gating technique  

作　　者：DU HongChuan LUO LaoYong WANG XiaoShan HU BiTao 

机构地区：[1]School of Nuclear Science and Technology,Lanzhou University

出　　处：《Science China(Physics,Mechanics & Astronomy)》2013年第5期888-895,共8页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.91026021,11075068,10875054,11175076 and 10975065);the Fundamental Research Funds for the Central Universities(Grant No.lzujbky-2010-k08);Scholarship Award for Excellent Doctoral Students Granted by Ministry of Education

摘　　要：We propose a theoretical scheme to generate a broadband supercontinuum using a modulated chirped polarization gating technique. By this technique, a broadband continuum of 155 eV can be obtained at microscopic level. The modulations on the supercontinuum can be eliminated after propagation. Then a smooth broadband supercontinuum with the bandwidth of 155 eV can be generated. As a result, isolated sub-100-attosecond pulses with tunable central wavelengths could be obtained straightforwardly. Our simulations also reveal that an isolated attosecond pulse can still be generated by using multicycle driving laser pulses, and the central wave- length of isolated attosecond pulse can be controlled by adjusting the delay rj （ra is the delay of the two counter-rotating circularly polarized pulses.）.We propose a theoretical scheme to generate a broadband supercontinuum using a modulated chirped polarization gating technique. By this technique, a broadband continuum of 155 eV can be obtained at microscopic level. The modulations on the supercontinuum can be eliminated after propagation. Then a smooth broadband supercontinuum with the bandwidth of 155 eV can be generated. As a result, isolated sub-100-attosecond pulses with tunable central wavelengths could be obtained straightforwardly. Our simulations also reveal that an isolated attosecond pulse can still be generated by using multicycle driving laser pulses, and the central wavelength of isolated attosecond pulse can be controlled by adjusting the delay τd (τd is the delay of the two counter-rotating circularly polarized pulses.).

关 键 词：HHG SUPERCONTINUUM attosecond pulse 

分 类 号：TN78[电子电信—电路与系统]