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ArcticMyst Security by Avery

Higher wavelength green?

Joined
Apr 26, 2010
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It's not noticeable on my ipod camera, but last night when I was lining up all my lasers for beam shots, I noticed my kaleidoscope pen is a much darker "grassier" green than my LG gold Lyra. I only notice it when looking at the beams from the side, looking at the dots, or with them shining to or away from me doesn't show much, but when looking at the faint beams side by side, it's obvious. I wouldn't go so far as to say 561, but perhaps 540-550. I wish it was a higher power so it was more noticeable, but either way, it's an interesting find. Anyone else have these sort of variances in their greenies? Any pics?
 





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It's not noticeable on my ipod camera, but last night when I was lining up all my lasers for beam shots, I noticed my kaleidoscope pen is a much darker "grassier" green than my LG gold Lyra. I only notice it when looking at the beams from the side, looking at the dots, or with them shining to or away from me doesn't show much, but when looking at the faint beams side by side, it's obvious. I wouldn't go so far as to say 561, but perhaps 540-550. I wish it was a higher power so it was more noticeable, but either way, it's an interesting find. Anyone else have these sort of variances in their greenies? Any pics?

It's probably not a different wavelength. DPSS is so very precise. Post some pictures side by side though.
 
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Oct 24, 2009
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I've noticed the same thing with a couple green pointers I've encountered, but like he said above they're so very precise any wavelength difference would be too small to be noticeable to anything other than a spectrometer. I think it has more to do with the beam collimation, as higher power density makes the color richer, I also think IR content could contribute to a change in color. Are both of your lasers IR filtered?
 
Joined
Apr 26, 2010
Messages
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I've noticed the same thing with a couple green pointers I've encountered, but like he said above they're so very precise any wavelength difference would be too small to be noticeable to anything other than a spectrometer. I think it has more to do with the beam collimation, as higher power density makes the color richer, I also think IR content could contribute to a change in color. Are both of your lasers IR filtered?

The LG one is, the star pointer is not, I've sent it through a red filter and looked at the dot through my webcam, and it glows blue, just like IR always does on my webcam. So it could be that. The less IR could make it a richer, purer green.
 
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IR does not affect the color perception of green lasers.
Perhaps the difference is due to power.
I have seen instances on here of green lasers producing more than the typical 532nm output. Cyparagon has one of them.

BTW: >532nm is more yellow. <532nm is more cyan. It doesn't really make sense to say a beam of light is a "darker color." Light can't be dark - only dimmer.
 
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Joined
Apr 26, 2010
Messages
4,175
Points
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IR does not affect the color perception of green lasers.
Perhaps the difference is due to power.
I have seen instances on here of green lasers producing more than the typical 532nm output. Cyparagon has one of them.

BTW: >532nm is more yellow. <532nm is more cyan. It doesn't really make sense to say a beam of light is a "darker color." Light can't be dark - only dimmer.

Well 561 is a darker green, that's what I was saying. It was less lime, and more grass in it's shade.
 
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No, 561 is a yellower green. There is no chance it is anything other than 532. Like Mr. Pierce said, you're mistaking differences in brightness for differences in color. :yh:
 

joeyss

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Your mind and eyes are very easily capable of playing games with you. Overload your green cones with too much light and your green laser will look like a yellowish color. Alot of it can be caused by 532's yellow-orange fluorescence on objects.
 
Joined
Jun 3, 2007
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It's not noticeable on my ipod camera, but last night when I was lining up all my lasers for beam shots, I noticed my kaleidoscope pen is a much darker "grassier" green than my LG gold Lyra. I only notice it when looking at the beams from the side, looking at the dots, or with them shining to or away from me doesn't show much, but when looking at the faint beams side by side, it's obvious. I wouldn't go so far as to say 561, but perhaps 540-550. I wish it was a higher power so it was more noticeable, but either way, it's an interesting find. Anyone else have these sort of variances in their greenies? Any pics?

Use a diffraction grating to determine wavelength of both lasers
 




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