Old 11-03-2014, 05:48 AM #1
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Default Laser trap (beam terminator)

I'm having some trouble finding information on this... I've got a 2.4w 445nm laser, and even with proper goggles on, the endpoint of the beam is pretty bright -- I'd like to keep that under control when working on a table with a clamp to secure the laser.

I'd like to build a contraption to capture and absorb the end point of a laser beam. Something like a box with a mirror at a 45 degree angle to the beam, and using that mirror to reflect onto a surface to absorb the beam safely.

I'd prefer to avoid re-inventing the wheel if there's a term for this I'm missing. Otherwise, what might be a good material to safely absorb a high-powered beam?

Thanks guys!


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Old 11-03-2014, 06:54 AM #2
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Default Re: Laser trap (beam terminator)

Terms: beam stop, beam dump

Here's a couple of past threads: http://laserpointerforums.com/f44/be...ion-60290.html, http://laserpointerforums.com/f39/bu...p-49955-2.html

BTW - It's usually preferred for you to introduce yourself here.
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Old 11-03-2014, 10:07 AM #3
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Default Re: Laser trap (beam terminator)

Quote:
Originally Posted by MisterAndy View Post
I'm having some trouble finding information on this... I've got a 2.4w 445nm laser, and even with proper goggles on, the endpoint of the beam is pretty bright
That should not be happening. The goggles you have will NOT suffice in protecting your eyes should a direct-hit accident occur. You need to buy new ones, stat.

Blue laser dot through the goggles has no business being brighter than this:



Comparison, good and crappy goggles:


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Old 11-03-2014, 10:13 AM #4
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Default Re: Laser trap (beam terminator)

When I use my eagle pair I still get a pretty bright dot, but the dot is yellow and can see no blue at all, end up getting eyestrain pretty quickly :/
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Old 11-03-2014, 10:24 AM #5
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Default Re: Laser trap (beam terminator)

Quote:
Originally Posted by 3Pig View Post
When I use my eagle pair I still get a pretty bright dot, but the dot is yellow and can see no blue at all, end up getting eyestrain pretty quickly :/
Agree with you there. I don't know why Eagle Pair googles are so popular on this forum they total suck. I have a pair and anything over 1 watt they are useless my eye strain and discomfort is the same with or without the eagles on.
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Old 11-03-2014, 03:47 PM #6
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Default Re: Laser trap (beam terminator)

Thanks for the terms and the links -- I'm eager to try anodizing razorblades for a beam dump. I would imagine that'd make for quite the little rig!

Also, the goggles I have right now are fairly cheap, and somewhere between the two pictures you linked, Eudaimonium. I just purchased two pair of Eagle Pair goggles and it's a little concerning to hear the feedback there, but I suppose we'll see!

If they're not good enough, I'll track something else down. Gotta protect those peepers.

I'll post in the newcomers thread soon -- Forgot to do so when I signed up, and then got caught up in this question. Thanks for the reminder!
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Old 11-03-2014, 04:09 PM #7
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Default Re: Laser trap (beam terminator)

You have bad eagle pair glasses then. Mine look identical to the first two posted, dont see the multimode bar at all, its a square/dot.

They are so popular because they are the cheapest pair you can get that do a good job at protecting your eyes. No one ever said they were the best and when asked for the best we all say certified glasses like those of thor labs.......what would you rather; uvex crap or eagle pair......there isnt even a debate

Edit: and ive used them with a 3.2W so I know they are good
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Old 11-03-2014, 05:08 PM #8
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Default Re: Laser trap (beam terminator)

I need to clarify something. My discomfort with my Eagle Pair googles only happens when I burn something up close, the dot is to much for me. General use Eagle googles are just fine I would say. I shouldn't of said they suck.
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405nm E-bay 303 host (peak 113mW) 13% IR dead
405nm Ehgemus host 900mW (peak 635mW 3E lens) had 2 both died in first minute
450nm home made labby NUBM44 6w (peak 7.2w)
445nm Ehgemus RPL host 3W (peak 3.5W)
445nm home made labby 3W (peak 3.1W)
445nm 501b by Blord 2.5W (peak 2.7W)
447nm Dragon Lasers Spartan 1W (peak 1.3W)
520nm custom Ehgemus host NDG7475 1W (peak 1.5W)
520nm Ehgemus host PL520-B1 120mW (peak 143mW)
532nm labby 500mW (peak 630mW)
532nm Dragon Lasers Viper 75mW (peak 122mW)
532nm C6 host (peak 103mW)
532nm E-Bay 303 host 200mW (peak 95mW) 15% IR
589nm Dragon Lasers Spartan 50mW (peak 115mW)
650nm C6 host (peak 153mW)
650nm E-Bay 303 host 200mW (peak 141mW) 75% IR
650nm DVD diode Mini Mag host 54mW (my first build)
650nm dollar store mini pen 5mW X2

808nm Wicked Lasers E2 400mW (peak 598mW)

Expanders & Googles etc:
Dragon Lasers 10x Beam Expander
Dragon Lasers "new" 2x Beam Expander
Dragon Lasers DGTBF
Dragon Lasers LSG02 goggles 190-548nm
Eagle Pair SL-BLG2 goggles 190-540nm

LPM:
nospin Ophir 20c-A-1-Y MrCrouse full wrap heatsinked

Flashlights:
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