The energy conversion efficiency and the damage threshold of aCsLiB6O10crystal have been measured for a pulse train with 80 pulses at 532 nm, each with energy up to 200 &mgr;J, 14 ps duration and 25 ns pulse to pulse spacing. Maximum energy conversion efficiency of 38&percent; has been measured when the crystal was used to convert 532 nm to 266 nm. The damage threshold of the crystal for this pulse train was measured to be >130 and <520GW/cm2.Both the high intensity of the micropulse and the fluence of the macropulse appear to affect the damage threshold. ©1997 American Institute of Physics.