Figure 5
From: Efficient OPSL-pumped mode-locked Yb:Lu2O3 laser with 67% optical-to-optical efficiency

Output power through a 0.4% output coupling mirror vs. emission wavelength of an OPSL-pumped Yb:Lu2O3 laser in cw operation at an absorbed pump power of 5 W.
The wavelength was tuned with a 1.5 mm birefringent filter.