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
Compensation for Self-Focusing of Picosecond Pulses in Nd:Glass by Using Cascaded Quadratic Nonlinearity
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
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.
(Frequency conversion; harmonic generation, including higher-order harmonic generation)
引用本文:
CHEN Hao;WEN Shuang-Chun;ZHU He-Yuan;QIAN Lie-Jia. Compensation for Self-Focusing of Picosecond Pulses in Nd:Glass by Using Cascaded Quadratic Nonlinearity[J]. 中国物理快报, 2004, 21(12): 2429-2432.
CHEN Hao, WEN Shuang-Chun, ZHU He-Yuan, QIAN Lie-Jia. Compensation for Self-Focusing of Picosecond Pulses in Nd:Glass by Using Cascaded Quadratic Nonlinearity. Chin. Phys. Lett., 2004, 21(12): 2429-2432.
2004, Vol. 21 
