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

We report a $\mathrm{KGd}({\mathrm{WO}}_4{)}_2$ Raman laser pumped by a $532\mathrm{nm}$ 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 $266–320\mathrm{nm}$. Output pulse energies of up to $0.22\mathrm{mJ}$ at $10\mathrm{Hz}$ pulse repetition rate and average output powers up to $48\mathrm{mW}$ at $5\mathrm{kHz}$ were achieved.