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Aklyatne
4.99mW Green Laser Toy
Joined: 11 Mar 2008
Posts: 5
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 Posted: 3/13/08, 6:45 AM Post subject: IR laser f |
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| What voltage would I need for a 980nm 10mw laser? If you can choose voltages (like between 5v and 9v), what would be the minimum for a solid, 'bright' dot about 50 feet away? |
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chickenfish
Wicked Lasers God
Joined: 22 Aug 2006
Posts: 1167
Picture(s): 52
Movie(s): 34
Location: UK
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| Posted: 3/13/08, 6:00 PM Post subject: |
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With IR lasers the idea is that it is "more or less" invisible. If you are suggesting getting a 10mW IR laser, you wont really see anything. If you buy a 400+ mW 808nm IR laser you will see a slightly red tinted dot. So the voltage of running a 10mW IR laser is totaly irrelevant. Bottom line is, its 10mW and more or less invisible.
If you want to see a "bright" dot at 50 or so foot, you want a green. But if your heart is set on IR then 10mW is WELL to low of a power for seeing a "bright" dot. Especialy at that wavelength.
I dont know your application, however if its just gonna be a bit of a big boys toy, then a 10mW Ir at 980nm isnt really going to be any fun.
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Phil
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Aklyatne
4.99mW Green Laser Toy
Joined: 11 Mar 2008
Posts: 5
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| Posted: 3/13/08, 6:19 PM Post subject: |
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I know that IR is invisible; that's why I put bright in ' '  I meant bright to a camera that can see IR. I'm using it with a wiimote to control a computer mouse on a projected screen. What voltage would be good? |
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Athoul
Wicked Lasers God
Joined: 13 Sep 2005
Posts: 7539
Location: Canada
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WDPaladin
Elite Laser
Joined: 05 May 2006
Posts: 218
Location: DeKalb, Illinois
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| Posted: 4/11/08, 5:42 PM Post subject: |
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Shoot, an IR camera will be able to see your TV remote control's IR port light up if you hit some buttons on the remote.. (Try it if you havent!)
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Eat Right, Exercise, Die Anyway!
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Aklyatne
4.99mW Green Laser Toy
Joined: 11 Mar 2008
Posts: 5
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| Posted: 4/13/08, 2:14 AM Post subject: |
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| Revive old topics much? |
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WDPaladin
Elite Laser
Joined: 05 May 2006
Posts: 218
Location: DeKalb, Illinois
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| Posted: 4/13/08, 7:40 PM Post subject: |
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That's a pretty witty response for someone with 5 posts here bub. Anyways..
Lets see here.
(W)=(I)*(E) So you're going to need to find out the amperage of the diode to find an operating voltage I think.
Anyone got any ideas on resistance, if applicable?
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DontLazeMeBro
Modified 10mW Greenie
Joined: 24 May 2008
Posts: 10
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| Posted: 5/25/08, 12:24 AM Post subject: |
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| I have been trying to get an IR diode of some salvaged equipment but with no luck. I should have just bought one and saved the money. lol. |
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Bluefan
Fusion Laser
Joined: 20 Apr 2008
Posts: 299
Movie(s): 1
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| Posted: 5/25/08, 6:35 AM Post subject: |
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Go for a complete module, diodes are quite fragile, and a module can take more (if you power it with batteries, voltage spikes are still nasty). And, a module already has collimating optics. Building your own diode driver can also be done, but it takes a bit time to build a decent one, not just a resistor, although that will work to, as the output power isn't really important to keep stable.
5mw is more than enough, and would be better for safety, 980nm is invisible but still there. |
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