1 mJ pulse energy with a pulse duration less 300 ps was achieved in Nd<sup>+3</sup>:YAG/Cr<sup>+4</sup>: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<sub>o</sub> = 53% and R<sub>e</sub> = 57% were obtained. Subnanosecond laser operating at 1064 nm, 532 nm and 355 nm wavelengths with high output brightness and intensity was constructed.