Acta Optica Sinica, Volume. 34, Issue 12, 1214002(2014)
Z-Scan Technique of Arbitrary Beam Shape and Medium Thickness
Based on split-step fast Fourier transform method and coordinate transformation, we establish simulation methods of propagation and focusing of arbitrary beam shape in the light-induced refractive index change medium, in order to calculate Z-scan opening and close aperture fitted curves of arbitrary beam shape and medium thickness. Under the conditions of thin medium and Gaussian beam, the fitting curve coincides with the classical algorithm. In the case of flat-top beam, the fitting results of this method are consistent with the experimental data. By using this method, the nonlinear absorption and nonlinear index coefficient of LiTaO3 crystal are measured. Finally, the Z-scan process of Gaussian beam and vortex beam in thick media is analyzed.
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Zhao Gang, Lü Xinjie, Qin Yiqiang. Z-Scan Technique of Arbitrary Beam Shape and Medium Thickness[J]. Acta Optica Sinica, 2014, 34(12): 1214002
Category: Lasers and Laser Optics
Received: May. 15, 2014
Accepted: --
Published Online: Nov. 4, 2014
The Author Email: Gang Zhao (zhaogang@nju.edu.cn)