Investigation of nonlinear dynamics in CdS by time-resolved nondegenerate pump–probe system with phase object |
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| Authors: | Min Shui Xiao Jin Zhongguo Li Junyi Yang Guang Shi Zhongquan Nie |
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| Affiliation: | 1. School of Physical Science and Technology, Soochow University , Suzhou 215006, P.R. China;2. Department of Physics , Harbin Institute of Technology , Harbin 150001, P.R. China;3. Department of Physics , Harbin Institute of Technology , Harbin 150001, P.R. China;4. School of Physical Science and Technology, Soochow University , Suzhou 215006, P.R. China |
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| Abstract: | The time-resolved nondegenerate pump–probe system with phase object is employed for investigation of nonlinear absorption and refraction dynamics in CdS. The 532?nm laser beam with 21?ps duration is used as the excitation and the laser beams of 600 and 680?nm with 10?ps duration from optical parametric generation are used for probing. The experimental results at both probe wavelengths show free-carrier absorption and large free-carrier refraction along with two-photon absorption and bound electronic optical Kerr effect. By numerically fitting the experimental data based on the nondegenerate pump–probe theory, the nondegenerate two-photon absorption coefficient, the nondegenerate Kerr coefficient, the free-carrier decay time, the free-carrier absorptive cross-section and free-carrier refractive coefficient at different wavelengths are all determined. |
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| Keywords: | nondegenerate dynamics free-carrier refraction two-photon absorption |
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