Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 117, Issue 4, Pages 1141-1147Publisher
SPRINGER
DOI: 10.1007/s00340-014-5937-4
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Funding
- National Science Foundation of China [11174160, 11474052]
- National Key Basic Research Program of China [2015CB352002]
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We present the Z-scan technique using azimuthal-variant vector beams for characterizing the nonlinear refractive index of an isotropic nonlinear medium. Compared with the conventional Z-scan measurements, the reliability of the vector beam Z-scan is improved because the focused azimuthal-variant vector beam exhibits a uniform-intensity focal ring instead of a focal spot. Experimentally, our investigation demonstrates that the Z-scan using radially polarized beams is a preferable technique for characterizing the optical nonlinearity of an imperfect sample.
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