M. Lando et al. [20] reported on solar side-pumped Nd:YAG laser experiments, which included comprehensive beam quality measurements and demonstrated record collection efficiency and day long operation. A 5.75 m2 segmented primary mirror was mounted on a commercial two-axis positioner and focused the solar radiation towards a stationary nonimaging-optics secondary concentrator, which illuminated a Nd:YAG laser rod. Solar sidepumped laser experiments were conducted in both the low and the high pumping density regimes. The low density system was composed of a 89 × 98-mm2 aperture two-dimensional compound parabolic concentrator (CPC) and a 10 mm diameter, 130 mm long Nd:YAG laser rod. The laser emitted up to 46 W and operated continuously for 5 hours. The high density system was composed of a three-dimensional CPC with 98 mm entrance diameter and 24 mm exit diameter, followed by a two-dimensional CPC with a rectangular 24 × 33 mm2 aperture. It pumped a 6-mm diameter 72 mm long Nd:YAG laser rod, which emitted up to 45 W. The results constituted a record collection efficiency of 6.7 W/m2 of primary mirror. A scaled up design for a 400 W laser pumped by a solar collection area of 60 m2, incorporating simultaneously high collection efficiency and high pumping density, was presented.