Solid-state Raman laser generating discretely tunable ultraviolet between 266 and 320 nm

We report a KGd(WO₄)₂ Raman laser pumped by a 532 nm laser that uses the intracavity nonlinear second harmonic and sum-frequency mixing of the Stokes and fundamental fields in β-barium borate to generate selectable output among eight output wavelengths over the range 266-320 nm. Output pulse energies of up to 0.22 mJ at 10 Hz pulse repetition rate and average output powers up to 48 mW at 5 kHz were achieved.