Old 12-04-2008, 12:09 AM #1
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Default see red at night?

Hello,
just got a pretty powerful red.
should i be able to see the beam in the night sky?
this is a smokin 230 mw. couldnt see any beam at all, lucky i am not tryint to point at stars.
my little green 5mw puts up a much better beam for piercing the dark.

thanks.
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Old 12-04-2008, 02:15 AM #2
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Default Re: see red at night?

The red laser is a much higher wavelength, So while it appears dimmer than the green, it can easily be more powerful. You can usually see the beam at night, but you need to be directly behind the laser to see it properly.
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Old 12-04-2008, 02:17 AM #3
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Default Re: see red at night?

Or have it aimed at you... Which I do not advise at all. ;D It should be really bright with fog, but green should still be about 4x, if not more bright.
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Old 12-04-2008, 02:54 AM #4
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Default Re: see red at night?

Thats why I didnt mention it, hehehe :P
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Old 12-04-2008, 04:41 AM #5
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Default Re: see red at night?

So if lower wavelength is better, does a blueray have an even more visible ray than green?
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Old 12-04-2008, 05:23 AM #6
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Default Re: see red at night?

Green is the most visible color to the human eye. So a green compared to any other laser at the same power will always appear MUCH brighter.

Bluray(405nm) is very near the low end of what our eyes can see. Some of us see it better than others. You will NOT see a bluray beam inside a lighted room for example without smoke or another agent in the air, unless you are looking straight from the laser down the beam. To even see the beam that way you need ~100mW of power.

But when the dot from a bluray hits something fluorescent, you will be amazed! ;D

EDIT: The pic in my avatar looks impressive..BUT that is a ~130mW bluray, mid-foggy night, and 10-second exposure..
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Old 12-04-2008, 06:25 AM #7
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Default Re: see red at night?

thanks for your comments.
i was out with my blu-ray tonite and could see the beam and it looked nice. sort of cloudy outside.
i couldnt see it hardly at all in the house on a cloudy day with blinds half closed, though.

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Old 12-04-2008, 07:25 AM #8
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Default Re: see red at night?

Yeah even a 300mw red is nowhere near as "bright" as my 5mw green in open sky (no fog, clouds),
but it is visible at 100 yards. (laser straight up at one end of football field, pal at the other)
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Old 12-04-2008, 10:39 PM #9
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Default Re: see red at night?

Quote:
Originally Posted by jonrobertd
Yeah even a 300mw red is nowhere near as "bright" as my 5mw green in open sky (no fog, clouds),
but it is visible at 100 yards. (laser straight up at one end of football field, pal at the other)
My 205mW red is a little bright that my metered 55mW CNI pen out side.
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Old 12-04-2008, 11:16 PM #10
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Default Re: see red at night?




Here is a chart showing relative perceived wavelength dependant intensity to the human eye, notice that the 532nm wavelength corresponds to a much higher value than ~660nm. This represents the reasons behind the differences in intensity based on your what your eyes tell you.
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Old 12-05-2008, 07:21 AM #11
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Default Re: see red at night?

Quote:
Originally Posted by brtaman



Here is a chart showing relative perceived wavelength dependant intensity to the human eye, notice that the 532nm wavelength corresponds to a much higher value than ~660nm. This represents the reasons behind the differences in intensity based on your what your eyes tell you.
I'm guessing that Y is eye sensitivity. What is X?
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Old 12-05-2008, 12:35 PM #12
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Default Re: see red at night?

That's strange, 230mW of red should be brighter than 5mW of green even with a significant difference in diameter. :-? Are you sure it isn't underpowered?

And , actually, without ANY agent in the air, bluray would have the brightest beam ;D
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Old 12-05-2008, 03:03 PM #13
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Default Re: see red at night?

It is harder to see red as said above, but at that power you should be able to see it at night. I can see a beam from a little 80mW red laser at night when its a little foggy.
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Old 12-07-2008, 03:27 AM #14
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Default Re: see red at night?

Like Switch said, if you shine it through an airless space, blu-ray is capable of ionizing the air particles, while other colors rely on water vapor and stray particles in the air.
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Old 12-09-2008, 05:13 AM #15
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Default Re: see red at night?

Quote:
Originally Posted by randomlugia
Like Switch said, if you shine it through an airless space, blu-ray is capable of ionizing the air particles, while other colors rely on water vapor and stray particles in the air.
Blu-ray lasers don't ionize the air. Otherwise you will have a lightning plasma laser. 8-) The 405nm wavelength is small enough to be diffracted off the molecules that make up air (nitrogen, oxygen, CO[sub]2[/sub] ect.). No agent is needed. That is why the sky is blue!
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Old 12-09-2008, 06:22 AM #16
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Default Re: see red at night?

Quote:
Originally Posted by Xplorer877
[quote author=randomlugia link=1228349379/0#13 date=1228620453]Like Switch said, if you shine it through an airless space, blu-ray is capable of ionizing the air particles, while other colors rely on water vapor and stray particles in the air.
Blu-ray lasers don't ionize the air. Otherwise you will have a lightning plasma laser. 8-) The 405nm wavelength is small enough to be diffracted off the molecules that make up air (nitrogen, oxygen, CO[sub]2[/sub] ect.). No agent is needed. That is why the sky is blue! *[/quote]


"An analytical solution based on Maxwell's equations has been developed for UV filamentation in air, arising from a dynamic oscillating balance between self-focusing, diffraction and plasma defocusing. This model suggests that UV (220-420 nm) 200 ps laser pulses with a peak power of around 50 MW (or 12.5 mJ input energy) and a beam size of 100 Ám are the optimal tool to trigger outdoor lightning."

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To test if your laser ionizes air, place your test leads from a DMM on each side of the beam testing the ohm rating.

*edit/ Or set the DMM to mV, cant remember... Had a customer a while back looking for a laser that could ionize :-? = suicide by lightning :
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