| Original Articles |
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Compensation for Self-Focusing of Picosecond Pulses in Nd:Glass by Using Cascaded Quadratic Nonlinearity |
| CHEN Hao1;WEN Shuang-Chun2;ZHU He-Yuan1;QIAN Lie-Jia1 |
| 1State Key Laboratory for Advanced Photonic Materials and Devices, Department of Optical Science and Engineering, Fudan University, Shanghai 200433
2School of Computer and Communication, Hunan University, Changsha 410082 |
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| Cite this article: |
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CHEN Hao, WEN Shuang-Chun, ZHU He-Yuan et al 2004 Chin. Phys. Lett. 21 2429-2432 |
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Abstract One of the obstacles in obtaining high power/energy laser sources is self-focusing, which stems from the nonlinear phase shift (B-integral) accumulated during beam propagation in Kerr media. Phase-mismatched second-harmonic generation may impose a nonlinear phase shift on the fundamental with controllable sign and magnitude, which can be used to compensate for self-focusing with a single-pass configuration. We have demonstrated such a possibility for picosecond pulses theoretically and experimentally, and both configurations of pre- and post-compensation by a β-barium borate crystal have been studied in detail. Cascaded second-order nonlinearity-based compensation for self-focusing may provide an auxiliary means to the conventional B-integral control techniques.
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| Keywords:
42.60.Jf
42.65.Jx
42.65.Ky
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Published: 01 December 2004
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| PACS: |
42.60.Jf
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(Beam characteristics: profile, intensity, and power; spatial pattern formation)
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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.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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