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Spatiotemporal Instability of Ultrashort Pulses in Dispersive Self-Focusing Media |
| 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 2001 Chin. Phys. Lett. 18 776-778 |
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Abstract Spatiotemporal instability in dispersive self-focusing media is
investigated on the basis of a modified nonlinear Schrödinger equation (NLSE) beyond the slowly varying envelope approximation. It is found that, for both normal and anomalous dispersions, space-time focusing may lead to the appearance of new temporal instability regions for some range of spatial frequencies. The physical origin of the new instability regions lies in the part of space-time coupling related to the fourth-order dispersion. Furthermore, space-time focusing shrinks the instability regions and slightly reduces the maximum growth rates of the original spatiotemporal instability gain spectra obtained from the standard NLSE.
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| Keywords:
42.65.Jx
42.65.Tg
42.60.Fc
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Published: 01 June 2001
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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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42.65.Tg
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(Optical solitons; nonlinear guided waves)
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42.60.Fc
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(Modulation, tuning, and mode locking)
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