Theoretical study of saturable Kerr nonlinearity using top-hat beam Z-scan technique |
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Authors: | Bing Gu Hui-Tian Wang |
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Institution: | a School of Physical Science and Technology, Nanjing Normal University, Nanjing 210097, China b National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China |
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Abstract: | Saturable Kerr nonlinearity is theoretically investigated by use of the top-hat beam Z-scan technique. The saturation intensity changes the nonlinear refractive profile and decreases the sensitivity of the Z-scan measurements, which were quantitatively analyzed. An empirical formula for the saturable Kerr nonlinearity, which gave the relationship between the light intensity and the peak-valley transmittance difference, was accomplished. A high-accuracy method to determine the nonlinear refractive index and the characteristic saturation intensity was proposed. |
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Keywords: | 42 65 An 42 65 Jx 42 25 Bs |
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