Abstract
A method is reported to simultaneously measure the nonlinear absorption and refraction coefficients of materials using a nonlinear-imaging technique with a phase object. In this technique, the sign and magnitude of both the nonlinear absorption and refraction can be acquired conveniently from the analysis of three experiment images: the linear image, the nonlinear image and the image without sample. In order to validate our approach, we demonstrate this method for ZnSe at 532 nm where two-photon absorption is present and the nonlinear refractive index n 2 is negative. The values of β (nonlinear absorption coefficient) and n 2 we measured are very close to the values found in other literature.
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Supported by the Program for New Century Excellent Talents in University (Grant No. NCET-04-0333) and the Excellent Youth Fund of Heilongjiang Province (Grant No. JC-04-04)
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Li, Y., Song, Y., Wang, Y. et al. Simultaneous measurements of nonlinear refraction and nonlinear absorption using a 4f imaging system. Sci. China Ser. E-Technol. Sci. 51, 1483–1490 (2008). https://doi.org/10.1007/s11431-008-0097-6
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DOI: https://doi.org/10.1007/s11431-008-0097-6