Chin. Phys. Lett.  2004, Vol. 21 Issue (12): 2429-2432    DOI:
Original Articles |
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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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.
Keywords: 42.60.Jf      42.65.Jx      42.65.Ky     
Published: 01 December 2004
PACS:  42.60.Jf (Beam characteristics: profile, intensity, and power; spatial pattern formation)  
  42.65.Jx (Beam trapping, self-focusing and defocusing; self-phase modulation)  
  42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2004/V21/I12/02429
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CHEN Hao
WEN Shuang-Chun
ZHU He-Yuan
QIAN Lie-Jia
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