We investigated the intensity-dependent loss properties of nonlinear crystals by using subpicosecond laser pulses at 264 and 211 nm. Two-photon absorption coefficients for potassium dihydrogen phosphate, beta-barium berate, and lithium triborate crystals were obtained from the intensity-dependent transmission measurements. (C) 2000 Optical Society of America OCIS codes: 160.4330, 190.4180.