Performance of Q-switched, Nd:YAG triangle slab laser pumped by 100 W quasi-cw diode bar

A Q-switched laser with triangular slab Nd:YAG crystal pumped by 100 W quasi-cw has been designed. Due to beam shaping optics consisting of rod lens and additional anamorphic objective, efficient near diffraction limited output has been achieved. The output energy of about 4.6 mJ was demonstrated for 14 mJ of pump energy in free running mode with optical slope efficiency 42% for multimode output of TEMON type (M-2 similar to 1.1 x 3.2). In Q-switching experiments, an LiNbO3 Pockets cell was placed between the slab and rear mirror in cavity with length of about 16 cm and flat output coupler with 20% transmission. The energy of 1.8 mJ in 21 ns pulse duration was obtained for output beam of TEM00 type. About 0.7 mJ with 50% efficiency was obtained in II harmonic with II type KTP crystal.