Phase matching in RT KTP crystal for down-conversion into the THz range
- Huang, Zhiming
- Nikolaev, N. A.
- Mamrashev, A. A.
- Antsygin, V. D.
- Potaturkin, O. I.
- Meshalkin, A. B.
- Kaplun, A. B.
- Lanskii, Grigory V.
- Andreev, Yury M.
- Huang, Jingguo
- Ezhov, Dmitry M.
- Svetlichnyi, Valerii A.
DOIAbstract
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
