Theory of Z-scan technique using Gaussian—Bessel beams with a phase object

doi:10.1088/1674-1056/19/7/074203

中国物理B ›› 2010, Vol. 19 ›› Issue (7): 74203-074203.doi: 10.1088/1674-1056/19/7/074203

Theory of Z-scan technique using Gaussian—Bessel beams with a phase object

税敏¹, 王玉晓¹, 李常伟¹, 张学如¹, 杨昆¹, 金肖², 宋瑛林², 杨俊义³

(1)Department of Physics, Harbin Institute of Technology, Harbin 150001, China; (2)Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, Soochow University, Soochow 215006, China; (3)Department of Physics, Soochow University, Soochow 215006, China

出版日期:2010-07-15 发布日期:2010-07-15
基金资助:
Project supported by the National Natural Science Fundation of China (Grant No. 90922007).

Theory of Z-scan technique using Gaussian—Bessel beams with a phase object

Jin Xiao(金肖)^a)b), Shui Min(税敏)^a), Wang Yu-Xiao(王玉晓)^a), Li Chang-Wei(李常伟)^a), Yang Jun-Yi(杨俊义)^b), Zhang Xue-Ru(张学如)^a), Yang Kun(杨昆)^a), and Song Ying-Lin(宋瑛林)^a)b)†

^a Department of Physics, Harbin Institute of Technology, Harbin 150001, China; ^b Department of Physics, Soochow University, Soochow 215006, China

Online:2010-07-15 Published:2010-07-15
Supported by:
Project supported by the National Natural Science Fundation of China (Grant No. 90922007).

摘要/Abstract

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.

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.

Key words: Gaussian—Bessel beams, phase object, Z-scan

中图分类号: (Optical susceptibility, hyperpolarizability)

42.65.An

42.79.Fm (Reflectors, beam splitters, and deflectors)

金肖, 税敏, 王玉晓, 李常伟, 杨俊义, 张学如, 杨昆, 宋瑛林. Theory of Z-scan technique using Gaussian—Bessel beams with a phase object[J]. 中国物理B, 2010, 19(7): 74203-074203.

Jin Xiao(金肖), Shui Min(税敏), Wang Yu-Xiao(王玉晓), Li Chang-Wei(李常伟), Yang Jun-Yi(杨俊义), Zhang Xue-Ru(张学如), Yang Kun(杨昆), and Song Ying-Lin(宋瑛林). Theory of Z-scan technique using Gaussian—Bessel beams with a phase object[J]. Chin. Phys. B, 2010, 19(7): 74203-074203.

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Theory of Z-scan technique using Gaussian—Bessel beams with a phase object

Theory of Z-scan technique using Gaussian—Bessel beams with a phase object

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