中国物理B ›› 2010, Vol. 19 ›› Issue (7): 74203-074203.doi: 10.1088/1674-1056/19/7/074203
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
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)†
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.
中图分类号: (Optical susceptibility, hyperpolarizability)