3MW peak power Nd+3:YAG/Cr+4:YAG microchip laser with efficient frequency conversion

1 mJ pulse energy with a pulse duration less 300 ps was achieved in Nd +3 :YAG/Cr +4 :YAG microchip laser. To overcome the polarization instability an output coupler sensitive to polarization was designed, using a multilayer dielectric mirror evaporated on a substrate made of a birefringent calcite crystal. Reflection coefficients for ordinary and extraordinary beams R o = 53% and R e = 57% were obtained. Subnanosecond laser operating at 1064 nm, 532 nm and 355 nm wavelengths with high output brightness and intensity was constructed.