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Old 05-10-2008, 02:04 AM #33
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Default Re: Have you hurt your eyes before

I read a report of a person who had IR laser light shining in his eye and didn't know it. Suddenly he heard/felt what he described as a click or pop in his eye followed by blindness.
I read reports of our military guys *ucking with the insurgents by shining IR targeting lasers into their eyes. The insurgents are supposedly scared to death of losing thier eyes by this covert method.
Two girls riding a bus home from school were testing the iris response with a red laser pen. One of the girls had the laser shone in her eye directly for up to five minutes. She recieved a burned retina, a black spot that will not heal.


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Old 05-10-2008, 09:45 AM #34
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Default Re: Have you hurt your eyes before

I got ht in the eye briefly by the static beam of my RGY, that wasn't nice. Another one was melting sand with high voltage, THAT was bright, i went off and got some sunglasses after that.....

My DIY red almost caught me out once, but luckily it didnt actually hit my eye, too close for comfort though....
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Old 05-11-2008, 12:26 AM #35
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Default Re: Have you hurt your eyes before

Quote:
Originally Posted by Things
I got ht in the eye briefly by the static beam of my RGY, that wasn't nice. Another one was melting sand with high voltage, THAT was bright, i went off and got some sunglasses after that.....

My DIY red almost caught me out once, but luckily it didnt actually hit my eye, too close for comfort though....
THAT is cool.
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Old 05-14-2008, 01:58 PM #36
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Default Re: Have you hurt your eyes before

Hello everybody!

I'm new to the lasers world and i would like to have some information about lasers risk:

I have a Nova 125mw rated 140mw average, what i would know is how many meters needs the laser to become "safe", what i mean is what is the distance afterward if pointed in eyes is not more dangerous?

I'm not saying i'm gonna point the lasers in someone eyes, but for my safety i would like to know... 8-)



sorry for my english, i'm from italy
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Old 05-14-2008, 09:07 PM #37
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Default Re: Have you hurt your eyes before

I'd get some goggles if I were you, diffuse (non reflective surfaces) reflections are not really ok. It would be safe shining it in the sky though.
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Old 05-15-2008, 08:46 AM #38
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Default Re: Have you hurt your eyes before

Quote:
Originally Posted by ardyp
Hello everybody!

I'm new to the lasers world and i would like to have some information about lasers risk:

I have a Nova 125mw rated 140mw average, what i would know is how many meters needs the laser to become "safe", what i mean is what is the distance afterward if pointed in eyes is not more dangerous?

I'm not saying i'm gonna point the lasers in someone eyes, but for my safety i would like to know... 8-)



sorry for my english, i'm from italy
It depends strongly on the amount of collimation of the laser, and the ambient light of the receiver (because the iris dilates). I would however say that it takes at least a few [s]miles[/s] hundred meters before it's completely safe.

I made up an approximation formula

(g*e*sqrt(i/s)-o)/d

d=divergence, radians
o=output aperture diameter, meter
i=laser intensity, mW
e=iris diameter, meter
s=safe intensity, mW
g=2 = factor of maximum intensity to average intensity in the entire (gaussian) spot

for example:
Laser:
d = 0.001 (1mRad)
o = 0.003 (3mm)
i = 140 mW
Eye:
e = 0.005 (5mm)
s = 0.1 mW

(2*e*sqrt(i/s)-o)/d = 372 m
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630nm <5mW mini (batteris+switch inside Aixiz)
660nm 265mW@0.5A Leadlight
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808nm ~450mW floodlight, 7-laser, no optics
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Old 05-15-2008, 10:48 AM #39
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Default Re: Have you hurt your eyes before

Quote:
Originally Posted by Zom-B
It depends strongly on the amount of collimation of the laser, and the ambient light of the receiver (because the iris dilates). I would however say that it takes at least a few [s]miles[/s] hundred meters before it's completely safe.

I made up an approximation formula

(g*e*sqrt(i/s)-o)/d

d=divergence, radians
o=output aperture diameter, meter
i=laser intensity, mW
e=iris diameter, meter
s=safe intensity, mW
g=2 = factor of maximum intensity to average intensity in the entire (gaussian) spot

for example:
Laser:
d = 0.001 (1mRad)
o = 0.003 (3mm)
i = 140 mW
Eye:
e = 0.005 (5mm)
s = 0.1 mW

(2*e*sqrt(i/s)-o)/d = 372 m
Wow that's was i was looking for! Sounds really scientific to me.


So you are saying that at 372m the laser will be completely safe? :



Thanks for the help
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Old 05-16-2008, 11:03 AM #40
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Default Re: Have you hurt your eyes before

Only when the numbers are correct. If your collimation is better, output aperture is smaller or the receiver's iris is larger, the number increases of course.
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405nm 166mW adjustable lab
405nm 130mW Xtreem
445nm 0.005W@1.7A semi-ghetto peltier-cooled labby-style handheld on batteries (BLL)
532nm 40mW New Wish pointer
630nm 5.00mW stable pointer
630nm <5mW mini (batteris+switch inside Aixiz)
660nm 265mW@0.5A Leadlight
660nm 208mW adjustable lab
808nm ~450mW floodlight, 7-laser, no optics
808nm 140mW IR module
...
Omitted are minor lasers, unworthy lasers, and bare diodes.

Forever wanted: ~505nm laser (and not just one of many lines!)
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