Old 03-26-2013, 07:34 AM #1
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Default Please school me on long range lasers.

Hi all I am new here and have been looking for info on long range lasers.

I have been unsuccessful so far, I want to know how to make a beam go for say 30km and have a small point. I have learned that this is quite a feat but what collimators would I need and what power?


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Old 03-26-2013, 07:43 AM #2
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Default Re: Please school me on long range lasers.

You will need something like this infront of a very powerful laser.. what's the budget ?

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Old 03-26-2013, 08:05 AM #3
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Default Re: Please school me on long range lasers.

I would not want to spend to much, but I have looked at some gear and I would expect the setup I want will be in the $2000-3000 range but I would only want to spend $1000.
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Old 03-26-2013, 10:00 AM #4
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Default Re: Please school me on long range lasers.

Elite Optoelectronics Co., Ltd. - Product -Green_Laser_Collimator

Would something like this work on say a low power laser of say 500mw? I have no idea on cost of this unit but a 500mw laser should be in the $1000 range. I am guessing that this collimator is worth more than most lasers am I right?
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Old 03-27-2013, 12:50 AM #5
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Default Re: Please school me on long range lasers.

500mw green lasers can be had for $400-$600 and are remarkable quality (from the right source of course).
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Old 03-27-2013, 01:03 AM #6
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Default Re: Please school me on long range lasers.

Yeah, you're going to need a beam expander to have any chance at 30km, along with quite a high powered laser so it isn't completely scattered by particles in the air by the time it gets there.

What is this for?
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Old 03-27-2013, 08:01 AM #7
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Default Re: Please school me on long range lasers.

Astronomy yea I know I don't need the range as such but want to see what I can do. I have emailed the supplier of the 0.01 mrad extender for a price.

I also want to sight ground objects for alignment again I don't really need the range as such, but don't we all want more than we need?

My original goal was to put a beam on the moon for fun but I have realised that this feat would cost upwards of 100k easily probably up to millions.

For a one million km range I have done rough math on it I would need something like 0.00001 mrad starting with a 5-10mm beam of 0.1 mrad. Power would only need to be able to break through the atmosphere after that atmospheric interference would cease to hamper the beam of light. So if I used a lab laser of 50w with a beam of 5-10mm and a 0.1 mrad I could collimate the beam I theorised using a telescope to get the mrad to the specs I need, but 30km is sufficient for now.

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Old 04-02-2013, 02:32 PM #8
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Default Re: Please school me on long range lasers.

Quote:
Originally Posted by rdyno View Post
I have been unsuccessful so far, I want to know how to make a beam go for say 30km and have a small point. I have learned that this is quite a feat but what collimators would I need and what power?
Most lasers are set up so that the beam 'waist' (point of minimum divergence) occurs at or near the output window. The larger the beam diameter at the waist, the smaller the dot will be at a given distance for a given divergence value.

To get the smallest spot at the greatest distance you may have to expand the beam to a relatively large diameter and focus it so that a new minimum-diameter 'waist' occurs at the target distance.

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Old 04-02-2013, 06:43 PM #9
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Default Re: Please school me on long range lasers.

Quote:
Originally Posted by rdyno View Post
Astronomy yea I know I don't need the range as such but want to see what I can do. I have emailed the supplier of the 0.01 mrad extender for a price.

I also want to sight ground objects for alignment again I don't really need the range as such, but don't we all want more than we need?

My original goal was to put a beam on the moon for fun but I have realised that this feat would cost upwards of 100k easily probably up to millions.

For a one million km range I have done rough math on it I would need something like 0.00001 mrad starting with a 5-10mm beam of 0.1 mrad. Power would only need to be able to break through the atmosphere after that atmospheric interference would cease to hamper the beam of light. So if I used a lab laser of 50w with a beam of 5-10mm and a 0.1 mrad I could collimate the beam I theorised using a telescope to get the mrad to the specs I need, but 30km is sufficient for now.
You seem like you know what you are doing. Play around with this app.
gausian beam rev 2.0.xls
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Old 04-02-2013, 09:53 PM #10
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Default Re: Please school me on long range lasers.

Am I the only one who thinks 30km is a tad bit far for a laser?
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Old 04-03-2013, 01:12 AM #11
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Default Re: Please school me on long range lasers.

^ Apparently...YES.

rdyno, about what size spot are you looking to achieve at (X) km?

Very likely the smaller the spot desired at distance, the larger the diameter of collimated beam required, and with correspondingly larger optics.

T.
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Old 04-03-2013, 02:38 AM #12
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Default Re: Please school me on long range lasers.

i bounced microwaves off the moon with a oven magnetron and a dish. ham radio is fun! the dish is a bit like a beam spreader, microwaves are a lot more forgiving than light. plus you get 800 watts to play with. try something like the catadioptric mirror lens, you can ebay a russian one for 50 bucks. spread the beam first to fully cover the input mirror so you dont highlight the mirrors inaccuracies. i have one in my camera junk cupboard i might try tomorrow. but yeah get a few hundred watts first, and warn the aviation authorities, maybe shoot mtv down by accident.
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Old 04-03-2013, 02:40 AM #13
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Default Re: Please school me on long range lasers.

what will you be viewing your 'dot' through? thats gona be a huge telescope
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