Ultrafast imaging the light-speed propagation of a focused femtosecond laser pulse in air and its ionized electron dynamics and plasma-induced pulse reshaping

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• 作者：Yanwu Yu ; Lan Jiang ; Qiang Cao ; Xueshong Shi ; Qingsong Wang…
• 刊名：Applied Physics A: Materials Science & Processing
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：122
• 期：3
• 全文大小：1,598 KB
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• 作者单位：Yanwu Yu (1)
  Lan Jiang (1)
  Qiang Cao (1)
  Xueshong Shi (1)
  Qingsong Wang (1)
  Guoyan Wang (1)
  Yongfeng Lu (2)
  
  1. Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081, People’s Republic of China
  2. Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588-0511, USA
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Optical and Electronic Materials
  Nanotechnology
  Characterization and Evaluation Materials
  Surfaces and Interfaces and Thin Films
  Operating Procedures and Materials Treatment
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0630

文摘

The light-speed propagation of a focused femtosecond (fs) laser pulse in air was recorded by a pump–probe shadowgraph imaging technique with femtosecond time resolution. The ultrafast dynamics of the laser-ionized electrons were studied, which revealed a strong reshaping of the laser field due to laser–air nonlinear interaction. The influence of laser fluence and focusing conditions on the pulse reshaping was studied, and it was found that: (1) double foci are formed due to the refocusing effect when the laser fluence is higher than 500 J/cm2 and the focusing numeric aperture (NA) is higher than 0.30; and (2) a higher NA focusing lens can better inhibit the prefocusing effect and nonlinear distortion in the Gaussian beam waist.