grainde
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- Joined
- Jan 29, 2012
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Great pics KapHn8d! Feel free to embed the images if you like.
I should finally convert my 20D to IR... :beer:
I should finally convert my 20D to IR... :beer:
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Which is the/a common wavelength that is absolutely invisible to the human eye. Would love a 5W ver for some wood litho, but I don't want to pull apart any 532's I no longer have.
It would seem to me that if the IR is aligned with the visible 532nm or other DPSS frequency, then that's actually safer, since you've got your normal visual aversion to look away or blink.
I always figured if the passthrough IR was a safety problem, it would be either if/when there's still significant IR output that's not eye-safe, but is below the threshold for the DPSS crystals to convert and re-lase, or if said IR was well collimated, but off axis from the main visible light wavelength beam. The one exception is if you're using a diffraction grating, or prism of some kind, assuming it's transparent in both wavelengths and will cause them to diverge.
If it's collimated AND aligned, then the visible beam provides warning.
If it's out of focus or not collimated, then the density/intensity beyond point blank will be low.
I'd think what's really dangerous is collimated and off-axis.
The comparison is accurate enough and the point of the exercise, in case you forgot, was to show that the IR is collimated
Yes, it can be. But to have divergence close to that of the green is the exception, not the rule.
From a safety standpoint, a tighter IR is arguably more dangerous. But If you don't point the laser near your face, there's really nothing to worry about.
Yes, but there is another situation we should consider; what happens when someone is eg burning, taking photos in front of the laser, using prisms / optics etc, but using saftey goggles that dont block IR only 532. If they get a specular reflection from a molten, or otherwise reflective surface, they can still get a direct hit from the IR.
I do agree though, the green will cause the blink reflex even with googles, due to the bright flash and yes off axis would be worse.
...thats 3 out of 3