Overcoming the output power threshold of 400 mW with high-gain diode pumped Pr:LiLuF4 waveguide lasers

In this work we present the power scaling of diode-pumped waveguide lasers fabricated in a Pr:LiLuF4 crystal by direct femtosecond writing. We demonstrated a maximum output power of 360 mW at 604 nm, 420 mW at 721 nm, and 55 mW at 523 nm. Moreover, we demonstrated what we believe to be the first operation of a waveguide laser at 545 nm. In the end, we achieved stable lasing at 604 nm with an extraction of 96%, demonstrating the high gain achievable in waveguide devices.