Distributed-feedback (dfb) laser oscillation is reported inCe3+-dopedLiSrAlF6(LiSAF). Tunable operation of theCe3+:LiSAFdfb laser is achieved in the ultraviolet wavelength region from 289 to 293 nm. At the peak emission wavelength of 290 nm, dfb lasing linewidths are less than the 1 Å resolution limit of the 1 m spectrometer. ©1997 American Institute of Physics.