中国物理B ›› 2010, Vol. 19 ›› Issue (12): 124210-124210.doi: 10.1088/1674-1056/19/12/124210

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High-order harmonics generation by few-cycle and multi-cycle femtosecond laser pulses

运晨霞1, 滕浩1, 詹敏杰1, 韩海年1, 钟欣1, 魏志义1, 王兵兵1, 张伟2, 侯洵3   

  1. (1)Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; (2)Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;The School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China; (3)The School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China
  • 收稿日期:2010-03-25 修回日期:2010-05-19 出版日期:2010-12-15 发布日期:2010-12-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 60608003, 10874237 and 60808007), and the National Basic Research Program of China (973 Program) (Grant No. 2007CB815104).

High-order harmonics generation by few-cycle and multi-cycle femtosecond laser pulses

Yun Chen-Xia(运晨霞)a), Teng Hao(滕浩)a)†, Zhang Wei(张伟)a)b), Zhan Min-Jie(詹敏杰)a), Han Hai-Nian(韩海年)a), Zhong Xin(钟欣)a), Wei Zhi-Yi(魏志义)a)‡, Wang Bing-Bing(王兵兵)a), and Hou Xun(侯洵)b)   

  1. a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; b The School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China
  • Received:2010-03-25 Revised:2010-05-19 Online:2010-12-15 Published:2010-12-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 60608003, 10874237 and 60808007), and the National Basic Research Program of China (973 Program) (Grant No. 2007CB815104).

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摘要： This paper investigates experimentally high-order harmonic generation (HHG) of neon gas with 5-fs and 25-fs driving laser pulses. It has been demonstrated that the cutoff energy of the harmonic extreme ultraviolet photons is extended to 131 eV and the HHG spectrum near the cutoff region becomes continuum as the driving laser pulse duration is 5 fs; whereas much lower cutoff photon energy and discrete harmonic spectrum near the cutoff region are presented as the laser pulse duration is 25 fs. The results can be explained by the fact that neutral atoms can be exposed to more intense laser field before they are depleted by ionization because of the extremely short rising time of the few-cycle pulse. The 5-fs driving laser pulse paves the way of generation of coherent x-ray in the water window and single attosecond pulse.

Abstract: This paper investigates experimentally high-order harmonic generation (HHG) of neon gas with 5-fs and 25-fs driving laser pulses. It has been demonstrated that the cutoff energy of the harmonic extreme ultraviolet photons is extended to 131 eV and the HHG spectrum near the cutoff region becomes continuum as the driving laser pulse duration is 5 fs; whereas much lower cutoff photon energy and discrete harmonic spectrum near the cutoff region are presented as the laser pulse duration is 25 fs. The results can be explained by the fact that neutral atoms can be exposed to more intense laser field before they are depleted by ionization because of the extremely short rising time of the few-cycle pulse. The 5-fs driving laser pulse paves the way of generation of coherent x-ray in the water window and single attosecond pulse.

Key words: high harmonics generation, short pulse, super-continuum spectrum

中图分类号:  (Frequency conversion; harmonic generation, including higher-order harmonic generation)

  • 42.65.Ky
42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)