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• Chinese Optics Letters
• Vol. 18, Issue 7, 071903 (2020)
Shijia Hua1, Kang Du1, Heng Wang1, Wending Zhang1, Ting Mei1、*, and Elhadj Dogheche2
Author Affiliations
• 1Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, and Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China
• 2Université Polytechnique Hauts de France, IEMN DOAE CNRS, Campus Le Mont Houy, 59309, Valenciennes Cedex, France
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Abstract

Goodness of fit is demonstrated for theoretical calculation of z-scan data based on beams propagating in the nonlinear medium and the Fresnel–Kirchhoff diffraction integral in experiments with high nonlinear refraction and absorption. The constancy of nonlinear optical parameters is achieved regardless of sample thickness and laser intensity, which clarifies the physical significance of optical parameters. We have obtained $γ$ = 2.0 × 10-19 m2/W and $β$ = 5.0 × 10-13 m/W for carbon disulfide excited by a pulsed laser at 800 nm with pulse duration of 35 fs, which are independent of sample thickness and laser intensity. Affirming constancy of the extracted parameters to the incident light intensity may become a practice to verify the goodness of the z-scan experiment.
Copy Citation Text
Shijia Hua, Kang Du, Heng Wang, Wending Zhang, Ting Mei, Elhadj Dogheche. Affirming nonlinear optical coefficient constancy from z-scan measurement[J]. Chinese Optics Letters, 2020, 18(7): 071903