Air Force Looks To Laser-Proof Its Weapons

slugo writes "This wired.com article has probably the coolest laser destruction video you have ever seen. The video shows the Israeli and US Air Force working on laser defense systems. The US Air Force is starting to look for ways to laser-proof its bombs and missiles — with spray-on coatings, no less. They think everyone is going to figure this laser thing out sometime and need a defense against what they are already very good at — shooting things out of the sky with a laser."

Comments

Not so obvious...

[Firethorn]

Doesn't necessarily work as well as it does in scifi. Mirrors aren't perfect, and tend to gather things like dust, which reduce their efficiency even more. Not to mention different mirrors vary in their effectiveness with different spectrum lasers.

Shouldn't matter much, but at the high powers weaponized lasers operate at, they quickly destroy mirrors.

As for working on anti-laser stuff, well, it's best to keep three steps ahead militarily wise - tends to keep your casualties down.

Re:Not so obvious...

[v1]

a simple chrome coating can add a few seconds of protection for a shell, enough to prevent it from being destroyed before it reaches its target. Mirrors are vulnerable because the reflective surface is usually very thin and poorly heat-protected. Chrome a shell and the shell serves as a heat sink to dissipate most of the energy the chrome actually ends up absorbing in the first place. Chrome's a lot hardier than a few microns of silvering.

The lasers weren't blowing holes in the shells, they were cooking them. They aren't nearly as devastating as you might at first believe. Several of their demos required several seconds to detonate the incoming round. If you can buy another 3 seconds of time on a shell, that's probably enough to beat the laser. You only have to survive the heat from the time you are acquired to the time you pass out of view of the laser.

I'm more interested in how they are generating that much laser energy. Most lasers of that calibre are chemical, and I didn't see what I would expect of a chemical laser. Being able to engage several targets one after another rapidly is a big plus over traditional chemical lasers, which require large amounts of chemicals which have to be pumped in, triggered, and vented to be replaced with more chemicals to fire again. The large flying laser beds work this way and I don't even know if they can fire more than once without landing and refueling with more chemicals. (though they are certainly more powerful than the one demo'd here)

They also demo this in the desert every time I see it. No clouds, low humidity, line of sight. Guess what laser weapons don't do well in?

Armour them and spin them.

[khasim]

The problems with lasers is that the need to punch through the armour in the time they can stay on target.

#1. Spin them. If the laser cannot hit the same spot for X fragments of a second then it cannot burn through (unless you get a bigger laser).

#2. For when the enemy gets a bigger laser, you coat the missile in a nice insulator. Something like carbon.

So now the laser has to punch through the carbon armour before the missile rotates new armour into sight.

Re:Laser-proof first post

[Arthur Grumbine]

Your first post is in as much danger from lasers as anything else. Which is none at all. It's been 25 years and untold billions of dollars secretly(gotta love the Cold War) pumped into viable military applications for lasers. What do we have to show for it?!? An entirely-useless-chemical-laser-carrying 747 that:

1) Has gotten so far in that last 12 years of focused development that it has finished "target illumination" testing.
2) Has 40 shot maximum payload (according to the entirely optimistic marketers of this project). They admit that it is only really specced for 20 shots now, though.
3) Does NOT have any variety shark attached to it.

I think Northrop Grumman, Boeing and all the other defense contractors had the following plan when they met with Reagan:
1)Convince The Gipper that Green lasers is just what's needed to kill the Red Communists. ("It'd be just like that recent film by that young George Lucas, and we know how much you love movies, Mr. President."
2) (optional) ???
3) Profit!!!

Re:It seems to slow for mortars.

[greyhueofdoubt]

We already have this. It's called the Phalanx sometimes, or just CIWS (close in weapons system). It features a 20 mm vulcan cannon, multiple radars, autonomous operation, and on top of that it can track multiple (dozens) incoming targets as well as its own outgoing projectiles. They can also network together to form a basewide protective shield. They are loaded with a tracer every 20 or 30 rounds and at night the bullet stream looks like the world's most powerful and accurate garden hose- one continuous stream of projectiles. The sound and feeling even from 200 yards is something you'll never forget, especially after you clean your pants the first time they fire without warning. Watching 5 of them fire in synch during a test is awe-inspiring (in good and bad ways, I guess).

Yeah, lasers, great... But in a deployed area, the CIWS provides early warning and interception of incoming mortars and missiles and doesn't require anything more than a generator and a full magazine. Someday lasers might provide an even better shield but until then we could use a few more CIWS in the field.

http://www.youtube.com/watch?v=cgpQBZF2sZQ

You should watch that video- dove or hawk, any geek has to admit that the phalanx is one bad ass mutha.

-b

Re:It seems to slow for mortars.

[Dun Malg]

Three words: Counter Battery Fire :)

Heh. Reminds me of a story about a sort of makeshift counterbattery fire someone once told me. Small Lebanese army military camp in Lebanon during the civil war, and every afternoon they'd go outside and play volleyball. Local shia militia jerks noticed the pattern and started dropping mortar rounds in the middle of their volleyball game every day. Immediate patrols trying to find them turned up nothing, as the shia militia jerks simply drop a few rounds, picked up the mortar tube, kicked sand over the base plate, and ran. Tiring of this, the Lebanese army guys measured the angle of the holes at the bottom of the impact craters made by the fuse assemblies being blown into the ground and used trigonometry to figure out where the rounds probably came from--- about a quarter mile away. Based on the size of the rounds, they knew the shias weren't taking the heavy base plate with them when they ran. They went out there in the middle of the night and, sure enough, right where they calculated, they found the mortar base plate. They picked it up, buried a big antitank mine underneath, and carefully concealed the plate just as they found it. Next day, they went out to play volleyball. Five minutes into the game, they head a loud explosion from the direction where the plate was. No mortar rounds ever interrupted their game after that.