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Raptor
25mW Classic Wicked Laser
Joined: 29 Sep 2005
Posts: 30
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 Posted: 10/13/05, 10:43 PM Post subject: holding th |
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How come you guys never hold the laser immediately infront of the peice of paper or tape or whatever you are burning? (I mean like less than a few mm away)
In the videos I only see you guys holding the laser several inches away but I would imagine the lasers strength would much greater if held immediately close to the subject. Or does it take several inches for the beam to focus directly or something? |
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kushy04
Fusion Laser
Joined: 10 Oct 2005
Posts: 355
Picture(s): 1
Location: Clarks Summit, PA
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| Posted: 10/13/05, 11:50 PM Post subject: |
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| to protect the laser module |
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Raptor
25mW Classic Wicked Laser
Joined: 29 Sep 2005
Posts: 30
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| Posted: 10/13/05, 11:52 PM Post subject: |
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| so then what is the safest distance? |
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kushy04
Fusion Laser
Joined: 10 Oct 2005
Posts: 355
Picture(s): 1
Location: Clarks Summit, PA
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| Posted: 10/13/05, 11:54 PM Post subject: Re: holdin |
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| Raptor wrote: |
| I only see you guys holding the laser several inches away... |
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Athoul
Wicked Lasers God
Joined: 13 Sep 2005
Posts: 7544
Location: Canada
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| Posted: 10/14/05, 12:08 AM Post subject: |
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The reflection of the laser could cause excess heat build up within the laser apperature and cause damage, also there isn't much difference in power when used at couple inches...lets say 5cm. I'll explain below.
The beam has a divergence of <1.5mrad, meaining at 1 meter the beam will be <1.5mm in diameter. The beam exits the apperature at ~0.5mm(where ~ means aproximatly). If my calculations are correct then at 1 meter the beam is ~<1mm wider. So at 4cm(40mm) the beam will be ~<0.04mm wider then when it exited the apperature, for a total of ~<0.54mm. The power loss is negligable at this distance, however it provides a safe distance to operate for the laser.
cheers, |
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chargerman
Wicked Lasers God
Joined: 08 Sep 2005
Posts: 1736
Movie(s): 2
Location: Big Horn Mountains, Wyoming
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| Posted: 10/14/05, 6:02 PM Post subject: Distance |
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To see how far away we can still burn, pop, smolder, scorch, fry and basically destroy 'N3ROWN3D!' with our kickass Wicked Lasers! Laser light is SOO much fun! Cheers Dale
_________________
Best Regards Chargerman
Great divergence calculator 
http://www.pseudonomen.com/lasers/calculators/ |
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