Phase matching in RT KTP crystal for down-conversion into the THz range J.-G. Huang, Z.-M. Huang, N. A. Nikolaev [et al.]
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ArticleSubject(s): нелинейно-оптические кристаллы | фазовое согласование | дисперсия | Селмейера уравненияGenre/Form: статьи в журналах Online resources: Click here to access online
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Laser physics letters Vol. 15, № 7. P. 075401 (1-4)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 plane by and 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.
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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 plane by and 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.
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