60 W Continuous-Wave Diamond Raman Laser in the Visible

Diamond Raman lasers (DRLs) are a promising approach to generating high power, otherwise difficult to reach wavelengths, with the capability of single-frequency output [1]. While the outstanding thermal properties of diamond have enabled DRL powers above 1 kW for quasi-CW operation [2], there are some challenges to increases power for true CW operation. The pump lasers for DRLs are often fibre-amplifier based, which are vulnerable to back-reflections, and are therefore followed by one or two isolators. While higher power isolator are in development, transmitted powers are typically limited to a few hundred Watts and they also introduce a thermal lens into the system that makes optimisation more complex. To reach the full potential of these lasers, these challenges must be approached.