New self-frequency converted Nd3+:KGd(WO4)2 Raman lasers

The spatial orientation of the optical indicatrix axes in a nonlinear neodymium-doped potassium – gadolinium tungstate Nd³⁺:KGd (WO₄)₂ crystal is determined more exactly in experiments. Miniature Raman lasers of two types emitting at 1538 nm are built based on this crystal. The laser of the first type has an output energy of 5 – 7 mJ and a pulse repetition rate of up to 1 Hz, while the laser of the second type has an output energy of about 20 mJ and a pulse repetition rate of up to 20 Hz.