Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers

LPF Donation via Stripe | LPF Donation - Other Methods

Links below open in new window

ArcticMyst Security by Avery

Terminate a beam

Mille

0
Joined
Jul 17, 2008
Messages
35
Points
0
What's a good way to terminate a beam?
So the beam is visible and the spot is absorbed and dont make reflections.
 





Joined
Sep 12, 2007
Messages
9,399
Points
113
Arnold-Schwarzenegger-The-Terminator_thumb.jpg


I'm not sure if beams are his specialty, per se. He might charge extra.
 
Joined
Apr 28, 2008
Messages
2,235
Points
0
Anything black, essentially :)

(^ He's got black on him... so... who knows) :)
 

Mille

0
Joined
Jul 17, 2008
Messages
35
Points
0
Yes something black, but i dont think it absorb the radiation completely.
Any hint to build something to have the smallest dot possible?

The terminator without skin could be dangerous with lasers :D
 

Maven

0
Joined
Jul 10, 2008
Messages
149
Points
16
i would try like black cloth or felt.. or build a little box and line the inside with black cloth and only a small hole going in.. that way nothing gets back out.. but second idea wont work if you are trying to see the dot.
 
Joined
Sep 16, 2007
Messages
3,658
Points
113
Get a small box, paint the inside black, and a metallic surface that will reflect the beam, but spread it out at the same time (something like a shiny quarter). It must be something that will not reflect the beam back toward the laser. It may help if you color the reflective surface black with a sharpie or something to increase the amount of absorbed light.
Position it at an angle in the box so that the reflection is directed toward a blank wall in the box.
The beam will reflect off the quarter (or whatever you use) and be diffused, making it easier for the inside of the box to absorb the light. Also, since the beam is spread out, it won't burn or melt holes in your box!
Make sure the entire thing is closed off except for the hole the beam is supposed to enter.
:)

beamstop.jpg
 
Joined
Mar 14, 2008
Messages
1,402
Points
0
I was thinking of something similar except I had the idea of drilling a hole in something and putting some sort of glazed glass in the way.
 

Mille

0
Joined
Jul 17, 2008
Messages
35
Points
0
Ok thanks for answers :)

The box with the mirror seems a good solution.
 
Joined
Mar 8, 2008
Messages
2,669
Points
48
Cutting wheels!!! The kind used on a die grinder or dremel for cutting metal.

Climbak used these to terminate his .5W green labby. When you think about it, they're perfect.

They are usually black, and designed to take a lot of heat. Climbak used a setup similar to the box/diffuser design, except he bounced the beam off of a mirror onto a pile of crushed up cutting wheels. Works like a champ!
 
Joined
Mar 14, 2008
Messages
1,402
Points
0
Why cutting wheels? Why not just rocks... how much heat can a diffused laser give out anyways?
 
Joined
Mar 8, 2008
Messages
2,669
Points
48
VillageIdiot said:
Why cutting wheels? Why not just rocks... how much heat can a diffused laser give out anyways?

Well, in climbak's case the beam wasn't diffused, he just bounced it off a mirror and onto the wheels.

The reason why the wheels are nice vs. rocks is because they are lightweight, and flat. The flatness helps if you're trying to view the actual dot. Where a rock may warp the dot, the flat surface of the grinding wheel should keep it pretty uniform. Not to mention a shiny rock could cause some reflections. :)
 
Joined
Mar 14, 2008
Messages
1,402
Points
0
I'm sorry, it's too late and I'm too tired to process logic and reason so here's a picture of a happy snake.

YHELOTHAR.gif
 
Joined
Aug 15, 2008
Messages
14
Points
0
You can use a tungsten screen. Hit it with the smoke from a candle to give it some carbon black. The tungsten won't melt. It has a lot of advantages. I think it's used as a beam dump for CO2 lasers.
 

Omega

0
Joined
Jul 19, 2008
Messages
124
Points
0
im going to ask a potentially dumb question.
why do you need to "terminate" said beam?
 




Top