Abstract
A monolithic diamond Raman laser is reported. It utilizes a 13-mm radius of curvature lens etched onto the diamond surface and dielectric mirror coatings to form a stable resonator. The performance is compared to that of a monolithic diamond Raman laser operating in a plane-plane cavity. On pumping with a compact Q-switched laser at 532nm (16μJ pulse energy; 1.5ns pulse duration; 10kHz repetition-rate; M2<1.5), laser action was observed at the first, second, and third Stokes wavelengths (573nm, 620nm and 676nm, respectively) in both cases. For the microlens cavity, a conversion efficiency of 84% was achieved from the pump to the total Raman output power, with a slope efficiency of 88%. This compares to a conversion efficiency of 59% and a slope efficiency of 74% for the plane-plane case. Total Raman output powers of 134 and 96mW were achieved for the microlens and plane-plane cavities, respectively.
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