Taking solar-powered lasers to new heights with four-mirror pumping

https://phys.org/news/2022-09-solar-powered-lasers-heights-four-mirror.html

"laser rods inside four 2V-shaped pump cavities, and pumped them with sunlight using four large off-axis parabolic mirrors with a total collection area of 10 m2... four secondary fused-silica aspheric concentrators, and four rectangular fused-silica light guides... laser power of 155.29 watts in TEM00 mode... two-fold enhancement collection efficiency and 1.24 times conversion efficiency... diode-pumped laser limited diode pump source lifetime... greater system simplicity and nearly free pump source"