Old 03-16-2009, 06:17 PM #1
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Default Sky laser beam ?!

Hi guys,

Could you please help me out on this little project !?

I need a laser beam that would be visible miles away.
It will be installed on top of 14 floor building.
Aiming beam to the sky. Something like greenwich "phantom"

Is it a DIY project, or i can buy ready kit from somewhere?

What kind of laser i need, what power?
What about heating problem? What color to choose?
Best if blue or violet

Will appreciate any help
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Old 03-16-2009, 06:18 PM #2
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Default Re: Sky laser beam ?!

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Old 03-16-2009, 06:36 PM #3
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Default Re: Sky laser beam ?!

Blue will be too much, violet will not be easy to see.
You're best to go with green, and you wouldn't need much power, 100-200 mW for a distance of ~ 14 miles in the night or foggy sky.
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Old 03-16-2009, 07:06 PM #4
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Default Re: Sky laser beam ?!

You know those signs that say "Call This Number Before Digging"?

Well, you might want to check this website, before installing your bat signal.

http://flightaware.com/


It does't matter to the cops or the FBI, whether you point a laser at a plane or the laser is stationary and the plane flies into it. Either one can get you jail time.
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Old 03-16-2009, 07:15 PM #5
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Default Re: Sky laser beam ?!

You should get a beam expander also. They are relatively cheap, and increase range with 10 or more times
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Old 03-16-2009, 07:19 PM #6
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Default Re: Sky laser beam ?!

If he plans to make his first priority the safety of planes I fully support his project. First step forget tall buildings and go to an empty area like a desert and again be careful that no planes are nearby. This isn't a game, if a plane somehow went down or crashed somehow you would responsible for the deaths of hundreds. Consider that fully.

Criminals are not welcome here but I'm sure he is just making plans, needed advice on the project, and to find an unpopulated area with no flights over it. That way your project would be safe to try. There are areas with no planes over them. Check what's called is a flight path before doing this, research plane flight paths and avoid all areas with planes.
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Old 03-16-2009, 07:35 PM #7
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Default Re: Sky laser beam ?!

This depends on what exactly you want to do...

For visibility vs. price, green is always the best choice.

If you want a visible beam that can be seen from the ground after a distance of a few miles, you may need a watt or more.
If you just want the spot to be seen, you will need more than 100mW and a laser with good divergence (or a beam expander).

Those pictures were taken with long exposures so the actual brightness may be less.

This would work best on a warm night.
If it is too cold and dry, there may not be enough moisture in the air. If it is too foggy, the beam will be very bright, but will be absorbed by the fog after only a hundred feet or so. (this is according to my experience).
If you plan on running this for long periods of time, you will need a laser capable of long duty cycles.

Whatever it is you plan on doing it probably won't be cheap.

The cheapest sufficient solution I can think of is to buy a 100mW green module from O-like.com and stick it in a big heatsink and hook it up to batteries. If you want a ready-made solution, Lasers like the Laserglow Aires and Optotronics RPL come to mind... And lab lasers, of course.
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Old 03-16-2009, 11:35 PM #8
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Default Re: Sky laser beam ?!

You need to contact the FAA or whatever airspace authority is in your country before doing this.

You guys giving advice need to be a little more responsible. No one knows if this is a kid or terrorist. Regardless who it is, its probably wise to get an idea who you are talking too first. Your advice could get someone hurt or arrested.
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Old 03-17-2009, 03:33 AM #9
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Default Re: Sky laser beam ?!

Thanx for answers,

No problem with planes, airport is 40 miles from city, and there are no planes flying over the city.
(not sure about helicopters or jetfighters)

I even can install sauron eye and no one will even bother

So, what i understand,
i need 1w Green Laser, with optics("beam expander&quot and a heatsink. !?

Why blue laser is a problem?

And is it possible to make laser show with this stuff? or i need other type of laser (kind of a laser machine used in clubs) ?
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Old 03-17-2009, 04:00 AM #10
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Default Re: Sky laser beam ?!

A blue laser isn't a problem assuming you have a couple tens of thousands of dollars to spend.
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Old 03-17-2009, 10:14 AM #11
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Default Re: Sky laser beam ?!

Quote:
Originally Posted by kbnn_

I even can install sauron eye and no one will even bother

You must provide a link! I want one!

;D
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Old 03-17-2009, 10:30 AM #12
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Default Re: Sky laser beam ?!

http://www.tesladownunder.com/tesla_...eakout%20point
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Old 03-17-2009, 01:24 PM #13
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Default Re: Sky laser beam ?!

Quote:
Originally Posted by kbnn_
Thanx for answers,

No problem with planes, airport is 40 miles from city, and there are no planes flying over the city.
(not sure about helicopters or jetfighters)

I even can install sauron eye and no one will even bother

So, what i understand,
i need 1w Green Laser, with optics("beam expander&quot and a heatsink. !?

Why blue laser is a problem?

And is it possible to make laser show with this stuff? or i need other type of laser (kind of a laser machine used in clubs) ?
If you're gonna be buying a prebuilt laser system you don't need a heatsink - the module itself will have that built in. You may however need an aluminum plate to mount the laser to as some have internal cooling systems that dump waste heat to the bottom surface.
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Old 03-17-2009, 03:00 PM #14
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Default Re: Sky laser beam ?!

Quote:
Originally Posted by kbnn_
Thanx for answers,

No problem with planes, airport is 40 miles from city, and there are no planes flying over the city.
(not sure about helicopters or jetfighters)

I even can install sauron eye and no one will even bother

So, what i understand,
i need 1w Green Laser, with optics("beam expander&quot and a heatsink. !?

Why blue laser is a problem?

And is it possible to make laser show with this stuff? or i need other type of laser (kind of a laser machine used in clubs) ?
Do have any idea what all that would cost you? *:P Radioshack would be a better place to get your answers...

Well sure friend, go down to radioshack and ask them for everything you need. Definitely a place that has lasers. We don't know so much here, ask the clerks at radioshack they are the real experts! Make sure not to get that 1 watt laser in your eye, be very careful with it.

Good luck, [smiley=thumbsup.gif]




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Old 03-17-2009, 06:20 PM #15
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Default Re: Sky laser beam ?!

laser83
Quote:
Do have any idea what all that would cost you?
few grand

Quote:
Definitely a place that has lasers
i guess maximum that i can get out of radioshack is a red laser pointer for 50$

Quote:
We don't know so much here, ask the clerks at radioshack they are the real experts!
Make sure not to get that 1 watt laser in your eye, be very careful with it.
I see you are a local smartass? Well i did not ask you to help me. I'm new in lasers, and i ask forum members because i think they have experience to advise a better solution.

p.s. sorry for mistakes if there are some, english is my second language.
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Old 03-17-2009, 06:46 PM #16
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Default Re: Sky laser beam ?!

Quote:
If you want a visible beam that can be seen from the ground after a distance of a few miles, you may need a watt or more.
Quote:
You're best to go with green, and you wouldn't need much power, 100-200 mW for a distance of ~ 14 miles in the night or foggy sky.
...!?

How do i decide what power i need, if you cant?

I guess i probably need a 5 watt green laser 532nm wavelenght (that would cost me according to optotronics ~ 10 gran) . Or is there a better solution?
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