REFRACTION MODULATION Z-SCAN FOR MEASUREMENT OF NONLINEAR REFRACTIVE INDEX Z-СКАНУВАННЯ З МОДУЛЯЦIЄЮ РЕФРАКЦIЇ ДЛЯ ВИМIРЮВАННЯ НЕЛIНIЙНОГО ПОКАЗНИКА ЗАЛОМЛЕННЯ

Kadan V., Dmytruk A., Bondar M., Dmytruk I., Goodarzi A., Akhtaryarazar D., ...Daha Fazla

Ukrainian Journal of Physics, cilt.71, sa.4, ss.275-282, 2026 (ESCI, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 71 Sayı: 4
  • Basım Tarihi: 2026
  • Doi Numarası: 10.15407/ujpe71.4.275
  • Dergi Adı: Ukrainian Journal of Physics
  • Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), Scopus
  • Sayfa Sayıları: ss.275-282
  • Anahtar Kelimeler: nonlinear refractive index, two-photon absorption coefficient, Z-scan technique
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

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.