[tt] sharks, with LASERS

[Eugen Leitl]

http://blog.wired.com/defense/2008/09/weapons-grade-l.html?rss

Weapons-Grade Lasers by the End of '08?  By Noah Shachtman September 02, 2008
| 4:34:00 PMCategories: Lasers and Ray Guns  

Defense contractor Northrop Grumman is promising the Pentagon that it'll have
weapons-grade electric lasers by the end of 2008. Which means
honest-to-goodness energy weapons might actually become a military reality,
after decades of fruitless searching.

For the longest time, the military concentrated on developing
chemical-powered lasers. They produced massively powerful laser blasts. But
the noxious stuff needed to produce all that power makes the weapons
all-but-impractical in a war zone. So the Defense Department shifted gears,
and poured money into solid-state, electric lasers instead. Under its  Joint
High-Powered Solid State Laser (JHPSSL) project, these beams -- once
considered too weak to do soldiers much good -- have made steady progress.
Now Northrop is promising to hit what's widely considered to be the threshold
for military-strength beams: 100 kilowatts. With that much energy, lasers
should be able to knock mortars and rockets out of the sky.

Northrop's system combines a bunch of smaller lasers into a bigger one --
Death Star-style, sorta. In March, the company announced that it had
completed the first of these eight "laser chains." Yesterday, the company
said it had joined two of the chains together. What's more, the beam combo
ran at peak power -- 30 kW -- "for more than five minutes continuously and
more than 40 minutes total; and achieved electrical-to-optical efficiency of
greater than 19 percent."

"We are completely confident we will meet the 100 kW of power level and
associated beam quality and runtime requirements of the JHPSSL Phase 3
program by the end of December, 2008," Bob Bishop, a Northrop Grumman
spokesman, tells Defense Daily.

And it's not the only energy weapon project that's making progress. The Army
just gave Boeing a $36 million contract to develop a laser-firing truck. The
company recently test-fired the real-life ray gun on its Advanced Tactical
Laser -- a gunship equipped with a chemical-powered blaster.  Raytheon has
worked up a prototype of its Phalanx mortar-shooter that uses fiber lasers,
instead of traditional ammo, to knock down targets. Even the eternally
delayed, chemically powered Airborne Laser -- a modified 747, designed to zap
ballistic missiles -- may finally get a long-awaited flight test.

[Photo: Northrop Grumman]