RUBY LASER PIERCES A SAPPHIRE CRYSTAL — A pulsed ruby laser piercing a sapphire crystal is shown on this week’s front cover. The laser at the Radio Corporation of America Laboratories in Princeton, ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This is a ruby crystal from Theodore ...

IN a cavity laser system, oscillation by stimulated emission occurs when the gain is sufficient to overcome the total loss in the cavity. Cavity loss not only determines the threshold condition of ...

As part of a comprehensive investigation of the dispersion of chimney gases from a power station, we have been much concerned with studying the behaviour of the buoyant plume during its initial rise.

If there’s one lesson to be learned from [Aled Cuda]’s pulsed laser driver, it’s that you can treat the current limits on electronic components as a suggestion if the current duration is measured in ...

Chemical catalysts are the change agents behind the production of just about everything we use in our daily lives, from plastics to prescription drugs. When the right catalysts are mixed with the ...

Lick Observatory, Calif.—It took 12 frustrating days and sleepless nights for the crew stationed on top of Mt. Hamilton, just outside San Jose, but finally at 2:00 a.m. August 1 the Laser Ranging ...

Leik Myrabo is an aerospace engineering professor at Rensselaer Polytechnic Institute who has demonstrated the feasibility of using ground-based lasers to propel objects into orbit; possibly reducing ...

The U.S. Army wants a deadlier laser weapon that won’t just burn a target, but rather will slice it up. Instead of low-power continuous wave lasers that emit a steady stream of energy, the Army wants ...