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IR filter, or no?






Bionic-Badger

Bionic-Badger

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I've found that there is always a significant, collimated IR component to any of these unfiltered green lasers, even with lasers where most of it diverges. In those 50mW stage lasers that Axixz was selling, most of it is collimated--not as much as the green, but still in a pretty tight cone. It might depend on the geometry of the laser module. However, to suggest that all of the IR diverges is simply false.

The thing with the IR is that if you're not using goggles, your pupils will get smaller because of the intensity of the green light. However, while using goggles, your pupils dilate, and if your goggles don't block IR, as most won't, your eyes can receive the full intensity of whatever IR there is.

What I have not seen is any actual measurement of the IR output of these green lasers. I can see the dot clearly through my IR camera, but that doesn't mean it's an intense beam. It does show, however, that the IR does exist and is still in beam form.
 
RA_pierce

RA_pierce

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Bionic-Badger said:
I've found that there is always a significant, collimated IR component to any of these unfiltered green lasers, even with lasers where most of it diverges.  In those 50mW stage lasers that Axixz was selling, most of it is collimated--not as much as the green, but still in a pretty tight cone.  It might depend on the geometry of the laser module.  However, to suggest that all of the IR diverges is simply false.

The thing with the IR is that if you're not using goggles, your pupils will get smaller because of the intensity of the green light.  However, while using goggles, your pupils dilate, and if your goggles don't block IR, as most won't, your eyes can receive the full intensity of whatever IR there is.

What I have not seen is any actual measurement of the IR output of these green lasers.  I can see the dot clearly through my IR camera, but that doesn't mean it's an intense beam.  It does show, however, that the IR does exist and is still in beam form.
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I have seen this also, however, I found that the beam appears to be tightly collimated as a result of the aperture blocking a large portion of the light.
But, I will not say that this is true for all lasers.

But as I said, IR leakage is only a hazard if you are hit directly in the eyes, and even in that case, the green light will do more damage.
 
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