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Advice for a custom green pointer that is safe for eye exposure.

Coonie

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Jan 12, 2018
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Note that it says "...with a visible effect relative to a fog machine". No I didn't mean to say "haze", I meant to say Fog. Fog does not make it dimmer. Fog helps the light scatter allowing you to see the beam far better than without it. I assumed this was your goal.
 



Ableton69

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May 6, 2019
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Note that it says "...with a visible effect relative to a fog machine". No I didn't mean to say "haze", I meant to say Fog. Fog does not make it dimmer. Fog helps the light scatter allowing you to see the beam far better than without it. I assumed this was your goal.
Then you dont know what a haze machine is. I have seen staff trying to use fog machines for a laser show and like you, failed to appreciate the difference.
Its too thick, does not hang and the particles are too big.
 

Coonie

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Then you dont know what a haze machine is. I have seen staff trying to use fog machines for a laser show and like you, failed to appreciate the difference.
Its too thick, does not hang and the particles are too big.
So I'm at fault for "failing to appreciate the difference"? It doesn't matter as that wasn't my point. Fog does not dim a lasers brightness. You seem to like to argue with people who try to offer help. I merely stated that using fog would help your cause unknowingly aware of your hate for fog machines.
 

Ableton69

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So I'm at fault for "failing to appreciate the difference"? It doesn't matter as that wasn't my point. Fog does not dim a lasers brightness. You seem to like to argue with people who try to offer help. I merely stated that using fog would help your cause unknowingly aware of your hate for fog machines.
OK, then look at it this way. A laser beam hits particles in the air and reflects that energy off them making the beam visible. So what you are saying the diatribution, number and size of those particles is irrelevant and those particles cause no energy loss whatsoever? Not to mention the fact a fogger will obscure the performer using the pointer.

And there is nothing wrong with arguing if done in a civilized manner.
 

GSS

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Apr 28, 2015
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Coonie,
in all fairness when I bring my lasers out in a very thick foggy night thinking i'm going to have a awesome bright beam, I find the beam yes is visible but not particularly bright. The thickness of the fog seems to "absorb"?? the laser light compared to the beam on a hazy light rain sprinkle night.

Yup, nothing wrong with a little back and forth of members opinions as long as its friendly and adds useful info.;)
 

hakzaw1

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Apr 2, 2009
Messages
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Confused much??
you write ;
'Fog is thicker with particles that are bigger then haze, which in turn blocks the ray as it travels away from the aperture and blocks the line of sight as well'

wait what?
if you are looking to lower power why go to a $$ hazer??(not saying you are correct)

IR left unfiltered is no big deal after a few meters away- If the lasers are moving non-stop any exposure would be minimal.

Do you have your location in your profile? Laws over there and not the same everywhere-so add your country into yr profile and make a nice intro in the 'welcome' section and we can greet & help you and then get back to our lasers.
Generally speaking lasers aimed downward or upward are less dangerous-- AVOID horizontal lasing and you will not need to worry about our own eye's lens and how it can make your 5 mW 532 into 100+mW retina burner. This happens most often when he beam is on the same plane as one's eyes.. The (?REAL)Laserman is very careful about where his beams go= and still AFAIK neither he nor the other 'lasermen' do shows in the USA

..see the vids-
s-l225LQ37YT13  KINGKUBE fat green.jpg


___________________________


kingkube lasers-fat green and red.

https://www.ebay.com/sch/i.html?_ftrt=901&_fsradio=%26LH_SpecificSeller%3D1&_sop=12&_sadis=15&_stpos=77422-9787&_odkw=&_saslop=1&_fss=1&_dmd=1&_sasl=blab1391&_osacat=0&_ipg=200&_ftrv=1&_from=R40&_trksid=m570.l1313&_nkw=laser&_sacat=0


gloves too-- I am building a pair with parts from Alan (forum name 'KingKube'
BTW FYI get larger size g;loves they tend to run smaller than we like.kigkube fat beams red.jpg

https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=gloves&_sacat=0&LH_TitleDesc=0&_saslop=1&_sop=12&_sadis=15&_fss=1&_osacat=0&_odkw=laser&_sasl=blab1391&_stpos=77422-9787

good luck with yr lasershow.. hak
 
Last edited:

Ableton69

New member
Joined
May 6, 2019
Messages
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3
Coonie,
in all fairness when I bring my lasers out in a very thick foggy night thinking i'm going to have a awesome bright beam, I find the beam yes is visible but not particularly bright. The thickness of the fog seems to "absorb"?? the laser light compared to the beam on a hazy light rain sprinkle night.
.;)
Excatly so, the beam does look awesome, but only to you. Imagine a fogger belching out a huge steam cloud and you standing in it.
All that everyone else is going to see is a green cloud.


Yup, nothing wrong with a little back and forth of members opinions as long as its friendly and adds useful info
👍
First time they asked is a smoke/fog machine ok, I said sure. Whats the difference. But it wasnt. Im not trying to be a smartarse, I can only speak from my own experience.
 

Alaskan

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Messages
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My thought is you cannot make the fog thick enough to make a weak laser appear bright enough for a laser show, no one would want to sit in a thick London fog to watch a show which causes the beams to be lost in the fog. Increasing the diameter of the beam will cause it to have less power density, which means if it hit you in the eye, less energy would hit the retina, but you are working backwards, as the beam would need to be more powerful when its diameter is larger, to appear bright.
 

Ableton69

New member
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May 6, 2019
Messages
14
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Confused much??
you write ;
'Fog is thicker with particles that are bigger then haze, which in turn blocks the ray as it travels away from the aperture and blocks the line of sight as well'

wait what?
if you are looking to lower power why go to a $$ hazer??(not saying you are correct)
I'm sorry I really dont understand what you are trying to say. I am looking to match the hand unit to the scanner. To see the laser beam, you need haze.

IR left unfiltered is no big deal after a few meters away- If the lasers are moving non-stop any exposure would be minimal.
That seems to be the consensus, damage occurs long before the IR is a factor. But I will probably be going with a pure diode.


Do you have your location in your profile? Laws over there and not the same everywhere-so add your country into yr profile and make a nice intro in the 'welcome' section and we can greet & help you and then get back to our lasers.
😔
I'll get around to it, dont pressure me! xD

I'm from Spain, so kind of a wild west situation concerning laser safety.

Generally speaking lasers aimed downward or upward are less dangerous-- AVOID horizontal lasing and you will not need to worry about our own eye's lens and how it can make your 5 mW 532 into 100+mW retina burner. This happens most often when he beam is on the same plane as one's eyes.. The (?REAL)Laserman is very careful about where his beams go= and still AFAIK neither he nor the other 'lasermen' do shows in the USA
Yes, but no matter how good, you cant always account for reflective surfaces or prevent a hand "scan" into the audience. I agree the laserman (Theo Dari) is careful, but he does do it sometimes. At 2.58 the right laser scans into the audience.
And US regulations are draconic, to say the least.
Atm my plan is a highly divergent beam (possibly expanded) @ 60mw with a safe rating at more then 5 meters.

I ordered excatly the same unit I think (green), it arrived and its not going to work out for me (way too big)
And yeah, any clothes size from china is a gamble, their medium is my small hehe

good luck with yr lasershow.. hak
Same for your project as well!
 

Ableton69

New member
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May 6, 2019
Messages
14
Points
3
My thought is you cannot make the fog thick enough to make a weak laser appear bright enough for a laser show, no one would want to sit in a thick London fog to watch a show which causes the beams to be lost in the fog. Increasing the diameter of the beam will cause it to have less power density, which means if it hit you in the eye, less energy would hit the retina, but you are working backwards, as the beam would need to be more powerful when its diameter is larger, to appear bright.
Right, there is a point where the air gets over saturated and starts working against you.
What you said about the diameter of the beam, is a very good point. I wonder if the relationship is linear, eg. a 20mw 3x expander would need 60mw for the same apparent brightness...
 

Alaskan

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My guess would be yes, but isn't there a square relationship which is some multiple we need to factor in for increased diameter? I know for radio wave propagation, there is an inverse square rule, not sure how it works for beams in the shape of a cylinder.
 

Ableton69

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Doing some Philosoraptor logic in my head, its true that by expanding you are diminishing brightness, but you are also getting 3x number of particles hit by light, which in turn results in a more visible beam. In events, some guests are up to 300 meters away from the show, so beam diameter counts.



It all comes down how small i can get it to be. This is nice, but too bulky.
 

Alaskan

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Good question... Cyp? Paul? Curtis? there are many more, where's eggs? Laser FAQ!
 







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