Refraction Modulation Z-Scan for Measurement of Nonlinear Refractive Index

Authors

  • V. Kadan Institute of Physics of the Nat. Acad. of Sci. of Ukraine
  • A. Dmytruk Institute of Physics of the Nat. Acad. of Sci. of Ukraine, Dept. of Physics, Taras Shevchenko National University
  • M. Bondar Institute of Physics of the Nat. Acad. of Sci. of Ukraine
  • I. Dmytruk Institute of Physics of the Nat. Acad. of Sci. of Ukraine
  • A. Goodarzi GUNAM Center for Solar Energy Research and Applications
  • D. Akhtaryarazar Dept. of Physics, Middle East Technical University
  • I. Pavlov Institute of Physics of the Nat. Acad. of Sci. of Ukraine, Dept. of Physics, Middle East Technical University

DOI:

https://doi.org/10.15407/ujpe71.4.275

Keywords:

Z-scan technique, nonlinear refractive index, two-photon absorption coefficient

Abstract

We present a novel single-beam refraction-modulation Z-scan technique that combines elements of the standard Z-scan and loss-modulation methods to enable sensitive measurement of third-order refractive nonlinearities in the closed-aperture configuration. Compared with the original Z-scan technique, the proposed method provides an almost background-free signal. An analytical expression relating the nonlinear refractive index n2 to the powers of the incident beam and the transmitted beam components at the first and second modulation harmonics is derived and experimentally verified using SiO2 and LiF samples.

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Published

2026-04-21

Issue

Vol. 71 No. 4 (2026)

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How to Cite

Refraction Modulation Z-Scan for Measurement of Nonlinear Refractive Index. (2026). Ukrainian Journal of Physics, 71(4), 275. https://doi.org/10.15407/ujpe71.4.275

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