The resulting Fresnel reflector concentrates 117 times the normal solar radiation onto a small point. It’s more than enough to burn holes in construction paper, but we’ll be using a microwave ...

And yet despite this, solar power still only contributes towards a tiny ... Yabe's first innovation was to use a Fresnel lens to collect and concentrate the sunlight pumping the laser material.

the Fresnel can have better properties. However, the distortions make them less suitable for imaging where regular lenses still reign supreme. A thinner lens, of course, should let more light ...