A high-repetition-rate femtosecond laser system operating, for the first time to our knowledge, in the spectral region near 200 nn is described. Frequency quadrupling of a mode-locked Ti:sapphire laser results in maximum average powers of 6 mm (165-fs pulses) and 15 mW (340-fs pulses) at 82 MHz. The shortest wavelength achieved is 193.7 nm. (C) 1998 Optical Society of America OCIS codes: 190.2620, 190.7110, 320.7080, 320.1110