Measurements of dynamics of nondegenerate optical nonlinearity in ZnS with pulses from optical parameter generation |
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| Authors: | Min Shui Zhongguo Li Xiao Jin Junyi Yang Zhongquan Nie Guang Shi Xingzhi Wu Kun Yang Xueru Zhang Yuxiao Wang Yinglin Song |
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| Institution: | 1. School of Physical Science and Technology, Soochow University, 215006 Suzhou, PR China;2. Department of Physics, Harbin Institute of Technology, 150001 Harbin, PR China;1. School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China;2. Department of Electronic Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China;1. Nanjing National Laboratory of Microstructures and School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China;2. Nanjing University Institute of Optoelectronics at Yangzhou, Yangzhou 225009, China;3. Department of Physics, Southeast University, Nanjing 210096, China;1. Institute of Electronics and Control System, Faculty of Electrical Engineering, Czestochowa University of Technology, Al. Armii Krajowej 17, Czestochowa 42-200, Poland;2. Lviv National University of Veterinary Medicine and Biotechnologies, Department of Inorganic and Organic Chemistry, Pekarska St. 50, 79010 Lviv, Ukraine;3. Institut Charles Gerhardt Montpellier (ICGM), UMR 5253 CNRS-UM-ENSCM, C2M, Université de Montpellier, CC1504, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France;1. Institute of Sensor and Actuator Systems, TU Wien, Vienna, Austria;2. Center for Integrated Sensor Systems, Danube University Krems, Wiener Neustadt, Austria;3. Institute of Electronics Engineering, National Tsing Hua University, Hsinchu, Taiwan;4. Institute of Electro-Optical Engineering, National Chiao Tung University, Taiwan;5. Institute of Physics, National Chiao Tung University, Taiwan;1. Department of Physics, Deenbandhu Chhotu Ram University of Science and Technology, Sonipat 131001, Haryana, India;2. Department of Physics, Hindu College, Sonipat 131001, Haryana, India |
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| Abstract: | We expand the degenerate PO pump-probe technique to nondegenerate field and use it to investigate optical nonlinear dynamics in ZnS single crystal. Excited by 532-nm laser pulses with 21-ps duration, the temporal response of nondegenerate nonlinear absorption and nondegenerate nonlinear refraction are probed by laser pulses from optical parameter generation (OPG) at 600 and 680 nm with pulse width of 10 ps. Based on the theory of free-carrier optical nonlinearity, we study the pure free-carrier refraction in ZnS. By numerically fitting based on the nondegenerate pump-probe theory, the nondegenerate two-photon absorption coefficient, the free-carrier lifetime, the free-carrier absorptive cross section and refractive coefficient at both probe wavelengths are determined respectively. The dispersion of the free-carrier refractive coefficients is discussed. |
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