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Makers and Making: I accidentally invented a death ray. Help.
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Mar 11th 2009
I've been umming and ahhing about what to do with this for the couple of weeks since I accidentally invented the thing (I was working on a solar energy device), and I thought you guys may be your usual well-spring of help and advice.

Basically I seem to have designed a device which will collimate an extended light source. Any light source. So you could, for example, turn a 100 Watt light bulb into a 100 Watt laser. Or a square meter of sunlight into a kiloWatt.

I haven't made it, but simming on the computer gives an optimal blow out rate of about 1/2 meters per kilometer, so over a range of meters or tens of meters it's pretty much as accurate as a normal laser.

The only upper limit I can see on how much power you could put through this thing is when the materials start melting, which would probably be pretty high.

There's really nothing fancy about it, it's just a shape. You could print it out easily on a 3d printer and fill it with some kind of settable glass for the total-internal-reflection. It would weigh about as much as a 2 litre bottle of water and be about the same size.

I was concerned about it being weaponisable, but even at a kiloWatt the lethal range would probably be less than 100 meters, in which case you might as well just get a gun.

I don't know if anyone's already done something like this, I can't find anything online, and people kept telling me it was supposed to be impossible.

So, um, yeah...
Mar 11th 2009
So do you have a question on the ethics or are you trying to find someone else who has tried the same thing?
Mar 11th 2009
It seems on the face fairly ethically neutral, but if there are potential problems with that I'm going to want to hear about them.
Also if someone's already done it.

Mostly I'm wanting to know about potential applications and just how valuable this would be, industrially speaking.
Mar 11th 2009
I think the key phrase is "I haven't made it yet".

I'd try making one and see if it works as well as your simulation.
If it does, you're in good shape.
Mar 11th 2009
alankilian sez: "I think the key phrase is "I haven't made it yet"."

Amen to that.

Make the thing and see if it really does what you expect. 10 to 1 it doesn't.
Mar 11th 2009
This is true, yes.

But... it was developed on proffessional optical design software, and given the simplicity of the design I'm fairly confident, touch wood, that it would behave in reality pretty much as it does digitally.

But, yeah, you never know for sure till it's made.

So, assuming it does work at least well enough to use...
Mar 12th 2009
Assuming it does work:
The main application that I would use it for would be a high efficiency laser cutter (could open the way for more in-house fabrication).
Mar 12th 2009
I would think the television, movie and theater business will make you an
instant multi-millionaire.

Imagine being able to use a 150 Watt light bulb in a spotlight and getting
150 Watts on an actor's face 20 meters away. They'll replace their expensive,
heavy, HOT 1,500 Watt spots overnight.

Remember us when you're rich!
Mar 12th 2009
That, Alan, is a very good idea.
Keep em coming.

I'm also thinking NASA or similar would probably like a extremely light-weight cutter/welder, which only requires raw sunlight for power.

So no one has ever seen anyone else do anything like this?
I don't want to repatent the wheel...
Mar 12th 2009
Well, I think you're one of the many who has been fooled by the
simulation into thinking something is going to work when it
isn't.

It happens all the time with electronic simulations and mechanical
simulations. They simply cannot account for all the physics going
on and you think you've come up with something until you try and
build it and only then you find out it doesn't work.

The magazine is called MAKE: for a reason.

Build it and they will come.

(I really don't intend to sound snarky, but you're asking us for
our ideas when you haven't done your part yet. Build a demonstration
unit, show it works and the ideas will come flowing in.)
Mar 15th 2009
You probably haven't...
What makes a laser a laser is just the
collimation is the power density thru
the aperture. A simple shape may
collimate but something that could
concentrate to a very narrow aperture
would have to be manufactured to
arbitrarily high tolerances. Anyway,
that is way occurs to me.
Mar 15th 2009
Sorry, didn't preview. It is not just the collimation
but also the power density
Mar 15th 2009
How do you mean?
I'm not a physicist so I'm a bit light on the finer details...
Mar 15th 2009
Unlike Alan, I have no problem whatsoever delivering the snark:

Make one. For real, physically, outa stuff. If it works, well, you're holding the power to subjugate us all and we'd have no choice but to do your bidding and monetize it for you.

Although possession of a death ray in and of itself is pretty well an already monetized situation.

If it doesn't work, then the parties involved will all be on the same page and no longer wasting their time.

Seems pretty Occamish to me.
Mar 15th 2009
Right you are.
I've got a mate in the relevant department of the local uni, I'll see what I can get done through them. Otherwise may well shell out for a 3d print and just fill the thing with water or mineral oil.
(Probabally water, the surface tension will help smooth the surface. I won't have to put much power through to prove the principle.)

Step 3: Profit!
Mar 16th 2009
Oh come on...hasn't anyone thought "You could demand One /Million/ dollars from the UN!"

Failing that, they'd likely strap onto large shark's heads quite well.

*grin*
Mar 16th 2009
@ KenCorey

"Although possession of a death ray in and of itself is pretty well an already monetized situation."

Didn't that kinda cover it?
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