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Advice for a laser build

rybat14

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Nov 16, 2021
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I am interested in building a laser for fun but it will also have a purpose.

Specs for my build:

Will regularly use to point from 200 yards, up to 1000 yards. I will be on the other end of the beam looking for where it contacts the object I am pointing at during day and night.
Smallest beam possible at 1000 yards.
Continuous beam for at least an hour. (basically something that wont burn up being on for an hour).

I am guessing green laser diode would be what I want because I want it easily visible.

And of course I would like to do this as inexpensive as possible. I will be building multiple of these.

Least powerful to get the job done is best. No need for overkill.


I have a cheap green laser that says good for 5 miles, but don't use continuously for more than a minute or it would burn up. I understand I need to build something more robust.

Thanks.
 



RedCowboy

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Have you ever taken a look at your beams spot at 100 yards much less 1000 ? It's not the little dot that you imagine, maybe you would do better sighting with a transit.

 

rybat14

New member
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Nov 16, 2021
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Have you ever taken a look at your beams spot at 100 yards much less 1000 ? It's not the little dot that you imagine, maybe you would do better sighting with a transit.
Thank you for the reply. A transit will not work for this situation. I do understand the beam will be wider the farther away it goes. I dont care if its 3+ feet wide as long as I can tell were the beam is at distance. I may have been a bit generous in my estimate of 1000 yrds. lets say 2-500 yrds. At 100 yards with my cheap >5mw pen laser the beam spot is fully visible during the daylight and yes it is larger which is ok. Something like this would probably do my job but I need more battery capacity and longer continuous use. When reading the fine print it says not to run for longer than 2 minutes at a time. ex. laser pointer store - jd-850-laser-pointer
 

Sowee7

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Feb 1, 2021
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Thank you for the reply. A transit will not work for this situation. I do understand the beam will be wider the farther away it goes. I dont care if its 3+ feet wide as long as I can tell were the beam is at distance. I may have been a bit generous in my estimate of 1000 yrds. lets say 2-500 yrds. At 100 yards with my cheap >5mw pen laser the beam spot is fully visible during the daylight and yes it is larger which is ok. Something like this would probably do my job but I need more battery capacity and longer continuous use. When reading the fine print it says not to run for longer than 2 minutes at a time. ex. laser pointer store - jd-850-laser-pointer
its definitely not 5mw, those “jd-850” lasers are like laser 303s 30-100mw of 532nm
 

bostjan

Active member
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Dec 29, 2011
Messages
161
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A 5 mW DPSS 532 green is fairly visible from 200 yards. Probably not worth bothering from 500 yards, though. A 30 mW would be visible, but 1.5mrad of divergence from 500 m away would be a light almost a meter wide, so what's the point?
 




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