The goal of this research was to design and develop a computer-controlled source of coherent, narrowline radiation, tunable in the ultraviolet range from 26 to 4 nm. This was accomplished by using a DEC LSI-11 minicomputer with CAMAC interface to control a single frequency dye laser, a second harmonic generation (SHG) crystal, beam directing optics, and diagnostic equipment. The computer system provided control of initialization, fine and coarse resolution scanning, wavelength calibration, and the acquisition and processing of data. Because of the number of interrelated adjustments necessary to tune a single-frequency ultraviolet source, computer control was needed for both convenient operation and optimum ultraviolet power. A new dye ring laser was designed for high single mode in the visible and ultraviolet regions. The motivation for this research came from the increasing need for a convenient, high-resolution, ultraviolet source of radiation for spectroscopic studies of molecules and atoms. This research has achieved i) a new level in resolution and power for CW ultraviolet radiation sources, and ii) has developed the software to conveniently control a CW visible-ultraviolet spectrometer.