Discretely tunable, all-solid-state laser in the green, yellow, and red

We report an all-solid-state intracavity Raman laser with intracavity nonlinear sum-frequency generation providing visible output wavelengths selected from second harmonics and sum frequencies of the fundamental and Stokes fields. The laser comprises a diode end-pumped Nd:YAG laser, an acousto-optic Q switch, a $\mathrm{K}\mathrm{Gd}{\left(\mathrm{W}{\mathrm{O}}_4\right)}_2$ Raman crystal, and a lithium borate nonlinear converter in a resonator designed to accommodate dynamic thermal lensing. For $20\mathrm{W}$ of pump power, output powers up to $1.8\mathrm{W}$ are demonstrated at wavelengths of 532, 555, 579, and $606\mathrm{nm}$, selectable by angle and temperature tuning of the nonlinear medium.