S.G.Grechin, S.S.Grechin, V.G.Dmitriev
"Complete classification of interaction types for second harmonic generation in biaxial nonlinear crystals"
Quantum Electronics (Rus.), 2000, v.30, N5, p.377-386

      A complete classification of phase-matching directions for the second-harmonic generation in biaxial crystals with quadratic nonlinearity is presented.

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