Oxide nonlinear crystals: optical properties and phase-matching for terahertz wave generationO.I. Potaturkin, V.D. Antsygin, A.A. Mamrashev, N.A. Nikolaev, Yu.M. Andreev, G.V. Lanskii, V.A. Svetlichnyi and K.A. KokhEPJ Web Conf., 195 (2018) 06012DOI: https://doi.org/10.1051/epjconf/201819506012