We have developed a near-diffraction-limited Q-switched Cr:LiSrAlF6 (C
r:LiSAF) laser system capable of producing 860-nm, 400-mJ pulses at a
repetition rate of 2 Hz. Our harmonic-generation experiments with beta
-BaB2O4 nonlinear crystals have yielded 200 mJ of energy at 430 nm and
40 mJ at 215 nm. To the best of our knowledge, the 50% second-harmoni
c conversion efficiency and UV energy demonstrated in this research ar
e the highest yet obtained from a Cr:LiSAF laser.