Self-phase modulation of an ultra-short laser pulse from laser breakdown plasma

Yongsheng Zhang; Lixin Yan; Guoxin Zheng; Lijun Wang; Jingru Liu

doi:10.1117/12.725336

29 January 2007 Self-phase modulation of an ultra-short laser pulse from laser breakdown plasma

Yongsheng Zhang, Lixin Yan, Guoxin Zheng, Lijun Wang, Jingru Liu

Proceedings Volume 6279, 27th International Congress on High-Speed Photography and Photonics; 62793V (2007) https://doi.org/10.1117/12.725336
Event: 27th International congress on High-Speed Photography and Photonics, 2006, Xi'an, China

Abstract

The detailed dynamic of an atom in a laser field with strength comparable to the atomic electric field is rich in physics and potential applications. Laser-breakdown plasma-induced spectral shifting in supersonic rare gases jet has been investigated with a sub-picosecond KrF excimer laser focused to peak intensity in the region of 10¹⁵W/cm². A 1.4mm diameter gas jet target was used in the experiment to minimize the refraction of the laser beam and thus a well-defined focused region was obtained. The typical quasi-periodic spectral shifting structures for helium and argon have been measured at various gas densities. For gas densities below 1x10²⁰cm^-3,both spectral red-shift and blue-shift were observed, indicating the gas is partially ionized, in contrast to the predominantly blue shifted as the gas densities grows high and fully ionized. Compared to the other ultra-short pulse measurement methods, qualitative information about the pulse can be deduced by observing their spectrum after interacting with rare gas.

Citation Download Citation

Yongsheng Zhang, Lixin Yan, Guoxin Zheng, Lijun Wang, and Jingru Liu "Self-phase modulation of an ultra-short laser pulse from laser breakdown plasma", Proc. SPIE 6279, 27th International Congress on High-Speed Photography and Photonics, 62793V (29 January 2007); https://doi.org/10.1117/12.725336

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KEYWORDS

Pulsed laser operation

Plasma

Helium

Argon

Gas lasers

Chemical species

Modulation

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