Low-threshold-intensity 3.8-W continuous-wave Ti:Sapphire oscillator directly pumped with green diodes

For fiber-coupled green laser-diode pump beam, a simple model was proposed to calculate the average outputs. Then we presented a direct-pumping continuous-wave Ti:Sapphire laser producing an optimized output of 3.8-W with green diodes. It was the highest output of this kind reported so far corresponding to an optical/optical conversion efficiency of 11.5% and a high slope efficiency of 15.7% at 810 nm. A highest power of 1.41-W was also obtained with the single-sided pumping corresponding to a good slope efficiency of 14.3%. High-power green diodes realized the lowest threshold pumping intensity of similar to 16.7 x 10(3) W/cm(2) under hundred-mu m-level beam diameter size. This work would benefit the design for the direct-pumping Ti:Sapphire laser as a guide.

Automated summary

A simple model was proposed to calculate the average outputs for fiber-coupled green laser-diode pump beam, and a direct-pumping continuous-wave Ti:Sapphire laser with green diodes achieved an optimized output. This work demonstrated the highest output reported so far with high optical/optical conversion efficiency and slope efficiency.