Highly efficient LD-pumped high power 718.5 nm Pr3+:YLF laser

Abstract

We reported a continuous-wave (CW) deep red laser at 718.5 nm in a Pr3+:YLF crystal pumped by an InGaN laser diode. A maximum output power of 3.95 W with an average slope efficiency of 41.3% was achieved at 718.5 nm. The full width at half maximum (FWHM) of the laser spectrum was 0.82 nm. To the best of our knowledge, the laser output power and slope efficiency were both the highest values that have been reported so far. In addition, the theoretical model was built to interpret the input-output power characteristics, and the simulated results were essentially consistent with the experimental results.