Calculation of double-refraction walk-off angle along the phase-matching directions in non-linear biaxial crystals

Abstract

The relations are established which allow the calculation of double-refraction walk-off angle for type I and type II processes of second harmonic generation. As an example these angles are calculated numerically in the case of second harmonic generation of 1064 nm from a Nd:YAG laser under phase-matched conditions for eight orthorhombic non-linear crystals: iodic acid, ammonium oxalate, lithium formate, potassium titanyl phosphate, calcium tartrate tetrahydrate, lithium gallium oxide, barium sodium niobate and potassium niobate.