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Blue lasers output IR?

SMIDSY

SMIDSY

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Hi guys, I understand how green and red lasers work but I'm lost on blue...

Does anyone know whether blue lasers will output IR? Do they work in the same way as greens (i.e. hundreds of mW IR converted into blue) or are thy like red ones with a simple LED like device?

cheers
 





I know the blues are DPSS, its not just a blue diode, I just don't know if the pump diode is an infrared. I would assume that it is.
 
It's still the same 808nm pump diode.And even though blues come in small powers (which is due to their inefficiency more than anything else) the pump diode is still really big and strong(inefficiency again). So yes, blue lasers need IR filters.
 
Correct. Blue is DPSS pumped by an IR diode. However, Blu-ray pointers that are becoming popular and are actually violet in color, are just a diode, just like red.
 
SMIDSY said:
thanks guys :)

so BR is child safe (if output is like 2-3mW)?
Click to expand...
I've heard the blu-ray is more damaging to the eyes than red or green at the same power. I can't remember why, but I got hit in the eye by a ~5mW Blu-Ray for a split second, and I had a nasty spot on my vision that I couldn't see out of for days.
 
Wow, that sucks.You sure it wasn't more than 5mW?Or that it wasn't focused to a smaller spot?
 
styropyro said:
[quote author=SMIDSY link=1206878171/0#6 date=1206891829]thanks guys :)

so BR is child safe (if output is like 2-3mW)?
Click to expand...
I've heard the blu-ray is more damaging to the eyes than red or green at the same power. I can't remember why, but I got hit in the eye by a ~5mW Blu-Ray for a split second, and I had a nasty spot on my vision that I couldn't see out of for days. [/quote]
i think its more dammaging to the eyes because its 405nm waves length and its near UV.
thats why they say dont stare at UV light, dont look at the sun during an eclipse because of UV ray.
 
I would also have to agree that at smaller power levels, the BR can do as much damage as a green or red with a much higher power rating, although i'm not sure why. When my ~20mw blu-ray is focused to a point, it will sting the skin unaided. I've done the same with other wavelengths with similar power and get no where near the same result. I also caught a reflection once and it give me a pretty good vision spot for about an hour. I would think that at 2-3mw it should be fine. The only problem at that power is that the dot will be hard to see because it is so close to the invisible light spectrum.
 
Haha, lucky me ;D. My glasses get dark in the sun and acts like sunglasses. When i point my blu-ray at them they get black in a instant and protect my eyes. This does not work with green or red lasers though.
 
Lol, same here. I can solve this mystery though.
Skin cells (most body cells; retina ones too) are more opaque to UV than visible light. Hence why UV is what burns you in sunlight and why a BluRay does more damage.
 
BlueFusion said:
Lol, same here. I can solve this mystery though.
Skin cells (most body cells; retina ones too) are more opaque to UV than visible light. Hence why UV is what burns you in sunlight and why a BluRay does more damage.
Click to expand...

ya beat me to it ;D

it's the same reasons why red lasers don't burn you, skin is mostly transparent to red so it just passes through instead of absorbing at the surface creating heat
 
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