10:15 〜 10:30
▼ [8a-Z19-6] High power Er:Lu2O3 ceramic laser at 2.8 μm
キーワード：Ceramic laser
With the rapid developments of laser medical treatment, remote sensing and material processing, the requirements for mid-infrared lasers in the 3 μm wavelength region are becoming more and more urgent. Er-doped sesquioxide such as Er:Y2O3, Er:Lu2O3 and Er:Sc2O3 are promising laser materials for 3 μm laser generation because of the low phonon energy and high thermal conductivity. Among these three materials, since the thermal conductivity of Er:Lu2O3 is less affected by the doping concentration, this material has a greater advantage in laser application and has produced a higher output power at room temperature, i.e., 5.6 W from a crystal laser. Currently, despite these advantages of Er:Lu2O3, the difficulty in growing this crystals is the main limitation for its wide-spread applications.
Transparent ceramics greatly reduce the difficulty of making sesquioxide laser materials, and are likely to promote the applications of Er-doped sesquioxides. Up to now, 2.3 W of CW output power has been reported from an Er:Lu2O3 ceramic laser. In this work, we report the optimization of a high power Er:Lu2O3 laser and the generation of highest output power at room temperature. Figure 1 shows the characteristics of the Er:Lu2O3 laser. The threshold pump power of the laser was 1.4 W, and a maximum output power of 4.6 W was obtained for the absorbed pump power of 18.4 W. The slope efficiency was as high as 28%. After comparing the laser spectra for different output couplers and pump powers, we found that the laser wavelength has no change and remains at 2846 nm.
Transparent ceramics greatly reduce the difficulty of making sesquioxide laser materials, and are likely to promote the applications of Er-doped sesquioxides. Up to now, 2.3 W of CW output power has been reported from an Er:Lu2O3 ceramic laser. In this work, we report the optimization of a high power Er:Lu2O3 laser and the generation of highest output power at room temperature. Figure 1 shows the characteristics of the Er:Lu2O3 laser. The threshold pump power of the laser was 1.4 W, and a maximum output power of 4.6 W was obtained for the absorbed pump power of 18.4 W. The slope efficiency was as high as 28%. After comparing the laser spectra for different output couplers and pump powers, we found that the laser wavelength has no change and remains at 2846 nm.