| Study of intensity-dependent nonlinear optical coefficients of GaP optical crystal at 800 nm by femtosecond pump-probe experiment |
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| 作者姓名： | 桑海宇 李鸣 余向阳 周建英 |
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| 作者单位： | National Laboratory for Superlattices and microstructures Institute of Semiconductors Chinese Academy of Sciences，State Key Laboratory of Optoelectronic Materials and Technology Sun Yat-Sen University，State Key Laboratory of Optoelectronic Materials and Technology Sun Yat-Sen University，State Key Laboratory of Optoelectronic Materials and Technology Sun Yat-Sen University，Beijing 100083 State Key Laboratory of Optoelectronic Materials and Technology Sun Yat-Sen University Guangzhou 510275，Guangzhou 510275，Guangzhou 510275，Guangzhou 510275 |
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| 基金项目： | This work was supported by the National Key Basic Research Special Foundation (NKBRSF) (No.G1999075200)the National Natural Science Foundation of China (No. 10425419). |
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| 摘 要： | The intensity-dependent two-photon absorption and nonlinear refraction coefficients of GaP optical crystal at 800 nm were measured with time-resolved femtosecond pump-probe technique. A nonlinear refraction coefficient of 1.7×10-17 m2/W and a two-photon absorption coefficient of 1.5×10-12 m/W of GaP crystal were obtained at a pump intensity of 3.5×1012 W/m2. The nonlinear refraction coefficient saturates at 3.5×1012 W/m2, while the two-photon absorption coefficient keeps linear increase at 6×1012 W/m2. Furthermore, fifth-order nonlinear refraction of the GaP optical crystal was revealed to occur above pump intensity of 3.5×1012 W/m2.
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