文献类型：期刊文献

英文题名：Enhanced high-order harmonic generation from excited argon

作者：Yuan, Xiaolong[1];Wei, Pengfei[2];Liu, Candong[1];Zeng, Zhinan[1];Zheng, Yinghui[1];Jiang, Jiaming[1];Ge, Xiaochun[1];Li, Ruxin[1]

机构：[1]Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China;[2]Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China

年份：2015

卷号：107

期号：4

外文期刊名：APPLIED PHYSICS LETTERS

收录：SCI-EXPANDED(收录号：WOS:000358924200010)、、EI(收录号：20153101097325)、Scopus(收录号：2-s2.0-84938253986)、WOS

基金：This work was supported by the National Natural Science Foundation of China (Nos. 11127901, 61221064, 60921004, 11134010, 11227902, 11222439, 11274325, 11404356, 61108012, and 11474223), the National 973 Project (No. 2011CB808103), the Zhejiang Provincial Natural Science Foundation of China (No. LY14F050008), the Shanghai Commission of Science and Technology Yangfan Project (No. 14YF1406000), the Shanghai Institute of Optics and Fine Mechanics Specialized Research Fund (Grant No. 1401561J00), and the Open Fund of the State Key Laboratory of High Field Laser Physics.

语种：英文

外文关键词：Argon - Ground state - Harmonic analysis - Harmonic generation - Optical pumping

外文摘要：We experimentally demonstrate an effective scheme to generate the enhanced high-order harmonics from a coherent superposition state of ground state and excited states in Argon. By controlling the time delay between the pump and probe laser pulses, a surprising enhancement plateau of high-order harmonic generation is observed, with a half lifetime of dozens of picoseconds. In the plateau, the harmonic intensity is enhanced by nearly one order of magnitude compared to the case without pre-excitation. Moreover, the gradual enhancement process is also presented when the pump intensity is increasing for improving the population of excited states, which can be attributed to the Rydberg states created by frustrated tunneling ionization. (C) 2015 AIP Publishing LLC.