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FrozenGate by Avery

Need IR Laser to burn paper from 5-300feet

A

asalada

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Sep 24, 2008
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Hi guys, where can i find cheap IR laser that can burn paper from 5-300 feet away? do i need focusable one?
I read some posts that laser diverges in mrad and IR diverges more than green, what is the specification i'm gonna need, which company offer a good price for the spec?
I prefer a torch style, i dont know if torch style is the best one since i'm going to use this as some kind of magic show outdoor.

I read that IR is from 808nm, and can be seen using camera, how about 1060nm?

thanks
 





1064nm is pretty high up in the spectrum, I dont htink that can be seen by camera. As for focusable, that would be your best bet. FOr burning paper, you would need atleast maybe 600mw for it to be impressive, below that and it will be kinda dodgy.
 
300ft? Dream on...Unless your laser is mounted on a very stable tripod, so is the paper, which is black and you have a beam expander.

It can be done but not in the way you're thinking, I mean, not just point your laser at a sheet of paper 300ft away and it will just burst into flame.
 
ok, so i need a beam expander for focusing from 5 feet to 300 feet?
tripod, i can get it. how bout other spec? 600mw enough from 300 feet? let's say i have white paper mounted on a drawing board (not moving).
 
Sorry but this will be close to impossible because of a few reasons.
1. You will need the laser to be extremely stable with something that focuses the laser at 300 feet.
2. To light paper on fire you will need some serious power, and at that power you the laser diode will be multimode so the beam expander won't work too well, so you will need even more power.
3. This won't be cheap.
4. You are going to have to figure in safety. One mistake and your crowd can't see anymore. Plus the paper can't be near the crowd because the dot of an invisible multi-watt laser is not good on your seeing balls.
 
Oops, completely missed the 300ft thing. I thought it was a matter of cm lol. to do serious stuff to paper at 300ft, your gonna need atleast a couple of watts of IR.
 
You mention that this is for an outdoor magic show. As has been stated already, an IR laser would be difficult and expensive at 300 feet. This can be done, but you might need the pentagon's optics budget. Is there another acceptable way to acheive the same result? Could you use perhaps radio control, or is there no way to hide a model R/C receiver and ignition mechanism?
 
The best i could get with 90 WATTS of IR from this with the proper optics was about 40 feet- to black construction paper..

Hand held at 300 feet will be in military weapon prototype category I'm afraid! :o

Yag 1064 is barely visible even at 2W to my digicam, had to dim the lights and turn off the flash to see the "dot".
 

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jamilm9 said:
it won't be cheap but co2
Click to expand...
CO2 wouldn't work for this because the light (10600nm) diverges too much, and you can't fix that with optics unless the optics were in front of the paper. Besides, ZnSe optics aren't cheap.
 
Is paper necessary? I mean, you could always try sharpied matches or something, or even settle for balloons.

The problem I see is that a powerful IR laser would be very dangerous to the eyes of the crowd, even from a considerable distance.

-Mark
 
if I have IR on a tripod, what's the maximum range for me to still be able to burn white paper using 1W IR power without beam expander, and how long will it take to start burning?

here I got price for IR:

huanic
DH808-1200-5:USD$285/set;
DB808-1200-5:USD$300/set;

s-ky
P808L -1000 Price:EUR 200

which one i should choose? skylaser or huanic?
 
You know what I use for long distance beam collimation? A shooters spotting scope. The optics tend to be broadband AR coated (for decent scopes anyway). Fire the laser though the eye piece and out comes a very wide beam with very little divergence. Using the focus on the scope as well as the zoom on the scope makes it pretty easy to fire 100m.

The issue I see, well besides the inherent safety issue, is that inexpensive IR lasers are diode based which means you use multimode diodes to generate the high powers with beam quality M2 of like 20. This makes it very hard to focus the beam to a fine point, and even more difficult to focus when expanded. The solution is a diode pumped YAG or YVO4 outputting 1064nm. The beam quality at that point is <2.0 but they cost much more.
 
Just buy a 1-2kw CO2 handheld laser module off of ebay. You can get 'em for like, $20. ;) ;D
 
chemical oxygen iodine laser might do the trick.

Get a hold of Northrop Grumman to get a quote.


But seriously... Like others have said, you're going to spend a fortune on optics and will need one hell of a laser. Why cant you mount them closer than 300ft? Or is it going to be like a 'wand effect' sort of thing (which will look really weird when you need to put your wand in a tripod... lol)
 
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