Phase matching in RT KTP crystal for down-conversion into the THz range

J. G. Huang, Z. M. Huang, N. A. Nikolaev, A. A. Mamrashev, V. D. Antsygin, O. I. Potaturkin, A. B. Meshalkin, A. B. Kaplun, G. V. Lanskii, Yu M. Andreev, D. M. Ezhov, V. A. Svetlichnyi

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10 Citations (Scopus)

Abstract

Dispersion of refractive index and absorption coefficients in flux-grown high-resistivity KTiOPO4 crystals between 0.2-2.5 THz are verified at room temperature by a THz-TDS. Measured dispersion components n x, n y and n z are approximated for the first time in the form of Sellmeier equations. Phase matching for down-conversion into the THz range under a visible and near IR pump is found possible only in the principle XZ plane by s f → f and s f → f types of three-wave interactions. Low frequency THz generation is favorable due to the low absorption coefficient down to 0.2 cm-1, below 0.5 THz.

Original languageEnglish
Article number075401
Number of pages4
JournalLaser Physics Letters
Volume15
Issue number7
DOIs
Publication statusPublished - Jul 2018
Externally publishedYes

Keywords

  • dispersion
  • down-conversion
  • KTP
  • nonlinear optical crystals
  • phase matching
  • KTIOPO4

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