[en] Pulsed operation of a 126 x 12 x 6 mm3 Nd:YAG slab laser is described. The output energy from the free-running oscillator is 24 J/shot with an efficiency of 2.5%, and that from the Q-switched laser is 860 mJ/shot with a pulse width of 12∼15 ns and a swiching efficiency of 72%