Fresnel lenses consist of a flat surface with interspaced, concentric steps whereby each step corresponds to the surface of a conventional lens. Each step thereby acts ... circular apertures and can ...

You’ll also need a focusing lens (just a few dollars), some thermal glue, an LM317, a resistor, and a pair of protective goggles matching the laser diode’s wavelength. He fits the diode into ...

Vision correction surgery, also called refractive and laser ... lens extraction (CLE), and refractive lens replacement (RLR). It’s the same as cataract surgery. The doctor makes a small cut ...

In particular, using a Fresnel lens coupled with a laser to fuse lunar regolith would reduce the power (and thus size, weight, etc.) of the laser astronauts would need to tote along, the study finds.

Despite what you may have heard, those 40 Watt laser cutters actually can cut out traces on your next PCB. Since he got his laser cutter a year and a half ago, [Rich] over at Nothing Labs has ...

It’s been a couple of years since Hisense refreshed its Laser TV ultra short throw projector ... semicircle indentation in the top where the lens is housed. The front looks to be a metal grille ...