飞秒激光驱动下氮和氪X射线辐射谱实验观测  

Experimental observation of X-ray radiation spectrum in N_2 and Kr using femtosecond laser

作　　者：夏元钦[1] 吴小燕[1] 陈德应[1] 王骐[1] 

机构地区：[1]哈尔滨工业大学光电子技术研究所

出　　处：《哈尔滨工业大学学报》2001年第3期276-279,共4页Journal of Harbin Institute of Technology

基　　金：国家高技术研究发展计划激光技术主题资助项目(86 3 410 );国家自然科学基金资助项目 (6 96 880 0 3)

摘　　要：以超短脉冲激光作为驱动源、基于光场感应的X射线激光是获得高效率台式X射线激光的一种新的泵浦机制 .建造了一套用于获得软X射线辐射谱的装置 ,并利用脉宽 1 0 5fs的Ti:sapphire激光器获得不同偏振特性、不同功率密度以及不同气压条件下的N2 和Kr 4 0～ 1 1 0nm的短波长荧光谱 .结果表明 :氮的短波长辐射谱强度与靶室内氮的粒子数密度及激光强度有关 .与Chichkov等人获得的相应波长范围的N2的辐射谱符合得比较好 ,并依此完成了单色仪定标 .氪的辐射谱为高次谐波 .The table top soft X ray lasers based on OFI driven by ultra short laser pulses is a new kind of pumping mechanism. We have constructed a set of device to generate soft X ray radiation spectrum. And the 40 nm～110 nm short wavelength fluorescence spectrum in nitrogen and krypton has been obtained with different laser polarization、different laser intensity and different gas medium pressures by using 105 femtosecond Ti:sapphire laser system produced in American Spectra Physics Lasers Incorporation. The spectrum intensities in nitrogen have relationship with not only the nitrogen densities in the target, but also the incident laser intensity. The nitrogen spectrum in this experiment coincides well with Chichkov's results and we have calibrated our monochromator with it. The radiation spectrum in krypton is high order harmonic.

关 键 词：飞秒激光 氮气 氨气 软X射线辐射谱 实验 观测 

分 类 号：TN241[电子电信—物理电子学]