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Red-Shift Conical Emission by Femtosecond Pulses at Low Input Power |
| LI Yue-Xun, JI Zhong-Gang, ZENG Zhi-Nan, LIU Jian-Sheng, GE Xiao-Chun, LI Ru-Xin, XU Zhi-Zhan |
| State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, PO Box 800-211, Shanghai 201800 |
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| Cite this article: |
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LI Yue-Xun, JI Zhong-Gang, ZENG Zhi-Nan et al 2008 Chin. Phys. Lett. 25 3272-3275 |
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Abstract Red-shift conical emission (CE) is observed by femtosecond laser pulse propagating in BK7 at a low input power (compared to those input powers for generation of blue-shift CE). With the increasing input power the blue-shift CE begins to appear whereas the red-shift CE ring (902nm in our experiment) disappears accompanied by the augment of the central white spot size synchronously. The disappearing of red-shift CE in our experiment is explained such that the increase of axial intensity is much higher than that of ring emission and the augment of the central white spot size with the increasing input laser power.
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| Keywords:
42.65.-k
42.90.+m
42.65.Jx
42.65.Sf
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Received: 03 June 2008
Published: 29 August 2008
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| PACS: |
42.65.-k
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(Nonlinear optics)
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42.90.+m
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(Other topics in optics)
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42.65.Jx
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(Beam trapping, self-focusing and defocusing; self-phase modulation)
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42.65.Sf
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(Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics)
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