| Theory of Z-scan technique using Gaussian-Bessel beams with a phase object |
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| 作者姓名： | 金肖 税敏 王玉晓 李常伟 杨俊义 张学如 杨昆 宋瑛林 |
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| 作者单位： | Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, Soochow University, Soochow 215006, China;Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, Soochow University, Soochow 215006, China;Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, Soochow University, Soochow 215006, China |
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| 基金项目： | Project supported by the National Natural Science Fundation of China (Grant No. 90922007). |
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| 摘 要： | This paper reports the theoretical study of combining Z-scan technique with Gauss-Bessel (GB) beams beside a phase object (PO) to measure the third-order nonlinear susceptibility components.By using this method,the sign of refractive index which depends on the shape of the close aperture Z-scan curve can be easily determined.Meanwhile,the magnitude of nonlinear coefficients can also be deduced by theoretical fit.The proposed method is advantageous for high sensitivity and imposes a lower stress in the cases of fragile materials,since small pulse energy is enough for the measurement of nonlinear coefficients.Predictions of the models are compared with Gaussian Z-scan measurement and GB Z-scan measurement.By using GB beams with a PO,the sensitivity of Z-scan measurements is found to be a factor of over 60 times greater than for Gaussian beams and 2 times greater than for Gaussian-Bessel beams.
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| 关 键 词： | Gaussian-Bessel beams phase object Z-scan |
Theory of Z-scan technique using Gaussian—Bessel beams with a phase object |
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| Jin Xiao,Shui Min,Wang Yu-Xiao,Li Chang-Wei,Yang Jun-Yi,Zhang Xue-Ru,Yang Kun and Song Ying-Lin.Theory of Z-scan technique using Gaussian-Bessel beams with a phase object[J].Chinese Physics B,2010,19(7):74203-074203. |
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| Authors: | Jin Xiao Shui Min Wang Yu-Xiao Li Chang-Wei Yang Jun-Yi Zhang Xue-Ru Yang Kun and Song Ying-Lin |
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| Institution: | Department of Physics, Harbin Institute of Technology, Harbin 150001, China; Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, Soochow University, Soochow 215006, China; Department of Physics, Soochow University, Soochow 215006, China |
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| Abstract: | This paper reports the theoretical study of combining Z-scan technique with Gauss—Bessel (GB)
beams beside a phase object (PO) to measure the third-order nonlinear susceptibility components. By using this method, the sign of refractive index which depends on the shape of the close aperture Z-scan curve can be easily determined. Meanwhile, the magnitude of nonlinear coefficients can also be deduced by theoretical fit. The proposed method is advantageous for high sensitivity and imposes a lower stress in the cases of fragile materials, since small pulse energy is enough for the measurement of nonlinear coefficients. Predictions of the models are compared with Gaussian
Z-scan measurement and GB Z-scan measurement. By using GB beams with a PO, the sensitivity of Z-scan measurements is found to be a factor of over 60 times greater than for Gaussian beams and 2 times greater than for Gaussian-Bessel beams. |
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| Keywords: | Gaussian—Bessel beams phase object Z-scan |
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