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Raman lasers based on bulk diamond are a valuable resource for generatingcoherent light in wavelength regimes where no common laser diodes areavailable. Nevertheless, the widespread use of such lasers is limited by theirhigh threshold power requirements on the order of several Watts. Using on-chipmicroresonators, a significant reduction of the lasing threshold by more thantwo orders of magnitude has been shown. However, these resonators lack acontinuous tuning mechanism and, mainly due to fabrication limitations, theirimplementation in the visible remains elusive. Here, we propose a platform fora diamond Raman laser in the visible. The device is based on a miniaturized,open-access Fabry-Perot cavity. Our microcavity provides widely-tunabledoubly-resonant enhancement of Raman scattering from high qualitysingle-crystalline diamond. We demonstrate a $>$THz continuous tuning range ofdoubly-resonant Raman scattering, a range limited only by the reflectivestopband of the mirrors. Based on the experimentally determined quality factorsexceeding $300\,000$, our theoretical analysis suggests that, with realisticimprovements, a sub-mW threshold is readily within reach. Our findings pave theway to the creation of a universal low-power frequency shifter, a potentiallyvaluable addition to the nonlinear optics toolbox.

Widely-tunable, doubly-resonant Raman scattering on diamond in an open microcavity