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

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

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.

Keywords: Gaussian—Bessel beams phase object Z-scan

Accepted manuscript online:

PACS:	42.65.An	(Optical susceptibility, hyperpolarizability)
	42.79.Fm	(Reflectors, beam splitters, and deflectors)

Fund: Project supported by the National Natural Science Fundation of China (Grant No. 90922007).

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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 2010 Chin. Phys. B 19 074203

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

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