Here we report a significant progress in solar-pumped laser slope efficiency and collection efficiency by pumping a 4.0 mm diameter grooved Nd:YAG single-crystal rod with a heliostat–parabolic mirror solar energy concentration system. The incoming solar radiation is firstly collected and focused by the system. An ellipsoid-shaped fused silica concentrator is then used to further compress the concentrated solar radiation into the grooved rod within a 2V-shaped pumping cavity. 4.5 W continuous-wave TEM00-mode (M2≤1.1) 1064 nm solar laser power is finally measured, attaining 2.36% laser slope efficiency, which is 3.37 and 2.91 times higher than previous records by Fresnel lens and parabolic mirror respectively. Record-high TEM00-mode solar laser collection efficiency of 4.0 W/m2 is also achieved.
|Number of pages||6|
|Journal||Solar Energy Materials and Solar Cells|
|Publication status||Published - 2016|
Liang, D., Almeida, J. M. M. M. D., Vistas, C. R., Oliveira, M., Goncalves, F., & Guillot, E. (2016). High-efficiency solar-pumped TEM00-mode Nd: YAG laser. Solar Energy Materials and Solar Cells, 145(3), 397-402.