High harmonic generation in helium-filled slab waveguide

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• 作者：Peng Gu ; Shi-Bing Liu ; Hai-Ying Song
• 刊名：Applied Physics B: Lasers and Optics
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：122
• 期：1
• 全文大小：1,044 KB
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• 作者单位：Peng Gu (1)
  Shi-Bing Liu (1)
  Hai-Ying Song (1)
  
  1. Strong-field and Ultrafast Photonics Lab, Institute of Laser Engineering, Beijing University of Technology, Beijing, 100124, China
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Electromagnetism, Optics and Lasers
  Physical Chemistry
  Laser Technology and Physics and Photonics
  Quantum Optics, Quantum Electronics and Nonlinear Optics
  Optical Spectroscopy and Ultrafast Optics
  Physics and Applied Physics in Engineering
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0649

文摘

High harmonics are generated in a newly designed gas-filled slab waveguide. A femtosecond Ti:sapphire laser is focused at an intensity of approximately 9 × 1014 W/cm2 into a 20-mm-long gas cell and a 20-mm-long gas-filled slab waveguide. An obvious extension of high harmonic orders is found in the guided configuration when the experimental result of high harmonic generation in the He atoms in the long gas cell is compared with that in the He-filled slab waveguide. Simple calculations and results from experiments performed with the gas cell and the gas-filled slab waveguide under different experimental conditions show that ionization-induced laser defocusing should be responsible for the lower cutoff position in the long gas cell. Our experimental results indicate that like the gas-filled capillary, the gas-filled slab waveguide restrains the effect of laser defocusing.