A Sensitive Scheme to Observe Weak Photo-Refraction Effects in Some Nonlinear Optical Crystals Pumped by Ultrashort Optical Pulses
XU Shi-Xiang1, GAO Yan-Xia1, CAI Hua2, LI Jing-Zhen1
1Shenzhen Key Lab of Micro-Nano Photonic Information Technology, Shenzhen University, Shenzhen 5180602Key Laboratory of Optical and Magnetic Resonance Spectroscopy, and Department of Physics, East China Normal University, Shanghai 200062
A Sensitive Scheme to Observe Weak Photo-Refraction Effects in Some Nonlinear Optical Crystals Pumped by Ultrashort Optical Pulses
XU Shi-Xiang1, GAO Yan-Xia1, CAI Hua2, LI Jing-Zhen1
1Shenzhen Key Lab of Micro-Nano Photonic Information Technology, Shenzhen University, Shenzhen 5180602Key Laboratory of Optical and Magnetic Resonance Spectroscopy, and Department of Physics, East China Normal University, Shanghai 200062
摘要We present a sensitive scheme, for the first time to our knowledge, to observe photo-refraction (PR) effects in some nonlinear optical crystals, e.g. β-BBO, LBO and BIBO, pumped by an intense ultrashort laser pulse chain. These quite weak effects are "amplified' by sensitive cw intracavity loss modulation. Our results show that they are repeatable and are dependent on pumping power and wavelength, and their response time ranges from tens of seconds to several minutes. The recorded dynamical transitions between the self-focusing to the self-defocusing (or vice versa) induced by the PR effect may be critically important for us to give more insight into the stability of some cascade nonlinear frequency conversions, e.g. multi-stage optical parametric amplifiers.
Abstract：We present a sensitive scheme, for the first time to our knowledge, to observe photo-refraction (PR) effects in some nonlinear optical crystals, e.g. β-BBO, LBO and BIBO, pumped by an intense ultrashort laser pulse chain. These quite weak effects are "amplified' by sensitive cw intracavity loss modulation. Our results show that they are repeatable and are dependent on pumping power and wavelength, and their response time ranges from tens of seconds to several minutes. The recorded dynamical transitions between the self-focusing to the self-defocusing (or vice versa) induced by the PR effect may be critically important for us to give more insight into the stability of some cascade nonlinear frequency conversions, e.g. multi-stage optical parametric amplifiers.
XU Shi-Xiang;GAO Yan-Xia;CAI Hua;LI Jing-Zhen. A Sensitive Scheme to Observe Weak Photo-Refraction Effects in Some Nonlinear Optical Crystals Pumped by Ultrashort Optical Pulses[J]. 中国物理快报, 2009, 26(11): 114209-114209.
XU Shi-Xiang, GAO Yan-Xia, CAI Hua, LI Jing-Zhen. A Sensitive Scheme to Observe Weak Photo-Refraction Effects in Some Nonlinear Optical Crystals Pumped by Ultrashort Optical Pulses. Chin. Phys. Lett., 2009, 26(11): 114209-114209.
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2009, Vol. 26 
