4.7 Article

Combination of muller matrix polarimetry and z-scan techniques for nonlinear refractive index measurement

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OPTICS AND LASERS IN ENGINEERING
卷 168, 期 -, 页码 -

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ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2023.107675

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Mueller matrix polarimetry; Z-scan; Nonlinear refractive index; Polarization state

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The polarization state of light has an impact on nonlinear refractive index measurement. This study combines Mueller matrix polarimetry with z-scan technique to investigate the reciprocal effects of optical nonlinearity and polarization. Through classical Mueller matrix polarimetry, the polarization states are generated before the sample in the z-scan system and analyzed after the sample and before the closed aperture detector. The thermal nonlinear refractive index of an Azo dye, Janus Green B, was measured using a CW laser at a wavelength of 655 nm, and the results were found to be highly sensitive to polarization states. The measured Mueller matrix at each position of the sample resulted in a nonlinear dependence of the related Deattenuation, Retardance, and Depolarization parameters.
Polarization state of light affects the results of nonlinear refractive index measurement. In this work by integrating Mueller matrix polarimetry with z-scan technique, reciprocal effects of optical nonlinearity and polarization is studied. By using classical Muller matrix polarimetry, polarization states generate before the sample in z-scan system and polarization state analyze after sample and before close aperture detector. By using a CW laser at 655 nm wavelength, thermal nonlinear refractive index of an Azo dye, Janus Green B, was measured. The results are very sensitive to polarization states. The measured Muller matrix in each position of sample result the nonlinear dependence of related Deattenuation, Retardance and Depolarization parameters.

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