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Chinese Optics Letters

Chinese Optics Letters

| PUBLISHED MONTHLY BY CHINESE LASER PRESS AND DISTRIBUTED BY OSA

  • Vol. 5, Iss. S1 — May. 31, 2007
  • pp: S159–S162

Self-compression of loosely focused pulses in gases with power close to self-focusing critical value

Xiaowei Chen, Zhinan Zeng, Jun Liu, Jun Dai, Xiaofang Li, Ruxin Li, and Zhizhan Xu  »View Author Affiliations


Chinese Optics Letters, Vol. 5, Issue S1, pp. S159-S162 (2007)


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Abstract

It is observed that the pulse duration of loosely focused pulses is self-compressed during the nonlinear propagation in argon when the input pulse peak power is close to the threshold power for self-focusing, and the results are confirmed by the numerical simulation. From the simulation we find that, near the lens focus the central part of the beam moves forward to the outer part owing to the plasma generation, and produces a leading peak in the temporal profile. And then, with the decrease of the plasma density, the spatio-temporal focusing and self-steepening effects predominate and promote a shock beam structure with a steep trailing edge. It is also found that, for our calculation case with the input pulse power close to the critical value of self-focusing, group velocity dispersion and multiphoton absorption effect have little influence on the propagation process, but the spatio-temporal focusing and self-steepening effects play a significant role in promoting the final pulse shortening.

© 2007 Chinese Optics Letters

OCIS Codes
(190.5940) Nonlinear optics : Self-action effects
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(320.5520) Ultrafast optics : Pulse compression

Citation
Xiaowei Chen, Zhinan Zeng, Jun Liu, Jun Dai, Xiaofang Li, Ruxin Li, and Zhizhan Xu, "Self-compression of loosely focused pulses in gases with power close to self-focusing critical value," Chin. Opt. Lett. 5, S159-S162 (2007)
http://www.opticsinfobase.org/col/abstract.cfm?URI=col-5-S1-S159


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