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Can you see the beam of a Blu-Ray or Blue laser?

Kansas Outcast

Kansas Outcast

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Yeah I deffinately wouldn't even touch a 1W blue laser unless I had the right eye goggles... its kinda of like "hmm do I spend $80 or ruin my vision for free....." Any laser I would just use goggles especially those chineese things that might not even have an ir filter on the green ones and they don't have any regulations so they can say its 1mw just to get it across US borders but you never know with those... (lease in my opinion) my friend bought a 5mw ebay laser from china testes teh power of it and it came to be much higher then 5mw
 





qumefox

qumefox

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david1235102 said:
you should listen to qumefox; go get it examined by an eye doctor.
also, anything above 4.95mW has the potential to cause eye damage; but as others have said, it depends on the situation: reflection or direct hit to eye, wavelength (color), power output, etc.
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Wavelength doesn't matter. If it's one that passes through the cornea, then it does the same amount of damage regardless of frequency. That's why thermal LPM's don't care about wavelength. A mW is a mW.
 
david1235102

david1235102

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qumefox said:
Wavelength doesn't matter. If it's one that passes through the cornea, then it does the same amount of damage regardless of frequency. That's why thermal LPM's don't care about wavelength. A mW is a mW.
Click to expand...

from what i've read here on the forums is that it is more dangerous to observe 405nm and 445nm lasers due to blue light hazard.
 
Kansas Outcast

Kansas Outcast

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david1235102 said:
from what i've read here on the forums is that it is more dangerous to observe 405nm and 445nm lasers due to blue light hazard.
Click to expand...

I'm not so sure about that, but 445's typically are set to higher power which can blind you pretty quick and the 405's since they arent as visible the light can be jsut as intense even if you cant pick up on it.. just like IR..

Someone will correct me if I'm wrong though
 
DrSid

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Wavelength does matter .. but the main reason is simply color absorption. Red light is not as well absorbed by retina as let's say 445nm. The red light will pass deeper into the eye, making less damage. But the amount of the effect is AFAIK unknown. You cannot rely on it.
Anyway yeah, blues are the most dangerous of the colors (outside from near IR, which is dangerous because it's not visible).
 
qumefox

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Blue light hazard is only for long term diffuse exposure. When talking about catching a laser in the eye, wavelength doesn't matter. Getting 100mW of 650nm is going to cause the same retinal burns that 100mW of 405nm would. The fact that the light gets focused to a point on your retina renders different absorption rates moot for the most part.
 
Kansas Outcast

Kansas Outcast

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qumefox said:
Blue light hazard is only for long term diffuse exposure. When talking about catching a laser in the eye, wavelength doesn't matter. Getting 100mW of 650nm is going to cause the same retinal burns that 100mW of 405nm would. The fact that the light gets focused to a point on your retina renders different absorption rates moot for the most part.
Click to expand...

That's what I was thinking too, a beam of light is a beam of light... just because the cones in your retina don't absorb it well enough doesn't mean it wont burn with a beam shot to the face...
 
Krogith

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Kansas Outcast said:
That's what I was thinking too, a beam of light is a beam of light... just because the cones in your retina don't absorb it well enough doesn't mean it wont burn with a beam shot to the face...
Click to expand...

Hes not saying it's less dangerous, Hes saying that different nm's of light do different type of damage, but all is bad for your eyes of course
 
david1235102

david1235102

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DrSid said:
Wavelength does matter .. but the main reason is simply color absorption. Red light is not as well absorbed by retina as let's say 445nm. The red light will pass deeper into the eye, making less damage. But the amount of the effect is AFAIK unknown. You cannot rely on it.
Anyway yeah, blues are the most dangerous of the colors (outside from near IR, which is dangerous because it's not visible).
Click to expand...

qumefox said:
Blue light hazard is only for long term diffuse exposure. When talking about catching a laser in the eye, wavelength doesn't matter. Getting 100mW of 650nm is going to cause the same retinal burns that 100mW of 405nm would. The fact that the light gets focused to a point on your retina renders different absorption rates moot for the most part.
Click to expand...

I understand it better now. thanks :)
 
qumefox

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Krogith said:
Hes not saying it's less dangerous, Hes saying that different nm's of light do different type of damage, but all is bad for your eyes of course
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For the subject at hand, they all do the same kind of damage. Burns.

Now the blue light hazard is different. That slowly degrades the rods and cones chemically, but that isn't instant damage. You have to be exposed to light in that particular band for quite a long time. Just don't stare at the dot of your high power 405 or 445 for hours a day every day and it won't be an issue.
 
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chipdouglas

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Hydrogen said:
The title explains it really, I can see the beam my 1mW green laser in daytime, I think it is overpowered, but anyway can you see the beam of a blue laser?
Click to expand...

this must be a typo. there is no way you can see the actual beam of a 1mw green laser, or any laser for that matter in the day time.
 
DrSid

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My 400mW green beam is visible all right inside a room during day. Outside I don't think so.
 
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