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Small-Scale Self-Focusing of Intense Laser Beams In the Presence of Vector Effect |
| WEN Shuang-Chun;FAN Dian-Yuan |
| National Laboratory on High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800 |
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| Cite this article: |
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WEN Shuang-Chun, FAN Dian-Yuan 2000 Chin. Phys. Lett. 17 731-733 |
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Abstract We extend Bespalov-Talanov (B-T) theory on small-scale self-focusing (SSSF) to include vector effect of a very narrow intense laser beam with application of the vector self-focusing model. The gain spectrum for perturbations is obtained by using the standard linear instability analysis. It is shown that the influence on SSSF of vector effect is closely related to the beam width. For a very narrow beam, the role played by vector effect becomes significant, it reduces the fastest growing frequency and the maximum growth rate, and shortens the frequency range for perturbation growing, and thus deviates the gain spectrum from that of B-T theory.
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| Keywords:
42.65.Jx
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Published: 01 October 2000
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| PACS: |
42.65.Jx
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(Beam trapping, self-focusing and defocusing; self-phase modulation)
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