Photonics (Apr 2023)

Two-Photon Absorption in Ca<sub>3</sub>(VO<sub>4</sub>)<sub>2</sub> and Ca<sub>2.7</sub>Sr<sub>0.3</sub>(VO<sub>4</sub>)<sub>2</sub> Crystals

  • Igor O. Kinyaevskiy,
  • Valery I. Kovalev,
  • Nikita S. Semin,
  • Pavel A. Danilov,
  • Sergey I. Kudryashov,
  • Andrey V. Koribut,
  • Elizaveta E. Dunaeva

DOI
https://doi.org/10.3390/photonics10040466
Journal volume & issue
Vol. 10, no. 4
p. 466

Abstract

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Two-photon absorption has been systematically studied in Ca3(VO4)2 and Ca2.7Sr0.3(VO4)2 crystals, both of which are prospective nonlinear optical and laser host materials. A strong dependence of the two-photon absorption coefficients on the orientation of the laser beam polarization with respect to the optical c-axis of the crystals is revealed. The measured coefficients for perpendicular and parallel orientations were 50 ± 10 cm/TW and 19 ± 4 cm/TW in Ca3(VO4)2, and 18 ± 3 cm/TW and 10 ± 2 cm/TW in Ca2.7Sr0.3(VO4)2, respectively. Thus, to minimize optical losses caused by two-photon absorption, an orientation of Ca2.7Sr0.3(VO4)2 crystals with the laser beam polarization parallel to the crystal optical c-axis is preferred.

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