中国物理B ›› 2013, Vol. 22 ›› Issue (5): 54209-054209.doi: 10.1088/1674-1056/22/5/054209

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Determination of temporal structure of femtosecond laser pulses by means of the laser-induced air plasma

张楠, 包文霞, 杨景辉, 朱晓农   

  1. Institute of Modern Optics, Nankai University, Tianjin 300071, China Key Laboratory of Optical Information Science and Technology of Ministry of Education, Nankai University, Tianjin 300071, China
  • 收稿日期:2012-08-22 修回日期:2012-10-17 出版日期:2013-04-01 发布日期:2013-04-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11004111 and 61137001), the Natural Science Foundation of Tianjin City, China (Grant No. 10JCZDGX35100), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20100031120034), and the Fundamental Research Funds for the Central Universities of China.

Determination of temporal structure of femtosecond laser pulses by means of the laser-induced air plasma

Zhang Nan (张楠), Bao Wen-Xia (包文霞), Yang Jing-Hui (杨景辉), Zhu Xiao-Nong (朱晓农)   

  1. Institute of Modern Optics, Nankai University, Tianjin 300071, China Key Laboratory of Optical Information Science and Technology of Ministry of Education, Nankai University, Tianjin 300071, China
  • Received:2012-08-22 Revised:2012-10-17 Online:2013-04-01 Published:2013-04-01
  • Contact: Zhu Xiao-Nong E-mail:xnzhu1@nankai.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11004111 and 61137001), the Natural Science Foundation of Tianjin City, China (Grant No. 10JCZDGX35100), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20100031120034), and the Fundamental Research Funds for the Central Universities of China.

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摘要： A new approach is presented to reveal the temporal structure of femtosecond laser pulses by recording the corresponding time-resolved shadowgraphs of the laser-induced air plasma. It is shown that the temporal structures of femtosecond laser pulses, normally not observable by the ordinary intensity autocorrelator, can be detected through intuitively analyzing the ultrafast evolution process of the air plasma induced by the femtosecond laser pulses under examination. With this method, existence of pre- and post-pulses has been clearly unveiled within the time window of ± 150 fs in reference with the main 50-fs laser pulses output from a commercial 1-kHz femtosecond laser amplifier. The unique advantage of the proposed method is that it can directly provide valuable information about the pulse temporal structures' effect on the laser-induced ionization or material ablation.

关键词: pulse temporal structure, femtosecond laser pulse, air plasma, pump-probe technique

Abstract: A new approach is presented to reveal the temporal structure of femtosecond laser pulses by recording the corresponding time-resolved shadowgraphs of the laser-induced air plasma. It is shown that the temporal structures of femtosecond laser pulses, normally not observable by the ordinary intensity autocorrelator, can be detected through intuitively analyzing the ultrafast evolution process of the air plasma induced by the femtosecond laser pulses under examination. With this method, existence of pre- and post-pulses has been clearly unveiled within the time window of ± 150 fs in reference with the main 50-fs laser pulses output from a commercial 1-kHz femtosecond laser amplifier. The unique advantage of the proposed method is that it can directly provide valuable information about the pulse temporal structures' effect on the laser-induced ionization or material ablation.

Key words: pulse temporal structure, femtosecond laser pulse, air plasma, pump-probe technique

中图分类号:  (Ultrafast processes; optical pulse generation and pulse compression)

  • 42.65.Re
32.80.-t (Photoionization and excitation) 52.50.Jm (Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.))