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ixfd64
Wicked Lasers Master
Joined: 27 Jul 2006
Posts: 571
Location: California
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 Posted: 4/01/07, 8:06 PM Post subject: safest way |
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For the very high-powered lasers, what are safe ways to terminate the beam? I mean, if the beam hits a wall, the reflection could still damage eyes. Even white walls aren't safe from damage, given what RoadRunner has shown us.
And I know it's not a good idea to have a laser pointed in the sky constantly, as people might call the police, etc.
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SteelTigers
Nexus Laser
Joined: 30 Mar 2007
Posts: 101
Picture(s): 39
Movie(s): 2
Location: USA
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| Posted: 4/01/07, 8:31 PM Post subject: |
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I don't think you effectively term a beam while using these PLDs as a pointing device or as a hand held novelty, other than pointing into the color black to absorb some of the frequency. If your mounting optics and using breadboards and are in test or home lab environment you can simply purchase bandpass, traps and or terms.
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RoadRunner
Wicked Lasers God
Joined: 05 Nov 2006
Posts: 2958
Picture(s): 1
Location: Scotland
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| Posted: 4/01/07, 8:52 PM Post subject: Re: safest |
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| ixfd64 wrote: |
For the very high-powered lasers, what are safe ways to terminate the beam? I mean, if the beam hits a wall, the reflection could still damage eyes. Even white walls aren't safe from damage, given what RoadRunner has shown us.
And I know it's not a good idea to have a laser pointed in the sky constantly, as people might call the police, etc. |
A matt-black heatsink... You can terminate tens of Watts quite safely into a reasonable heatsink.
Alternatively, your local policeman. Just stand him in the beam and tell him to close his eyes..!! 
The RoadRunner..
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Use the correct goggles and avoid eBaysers if you value your eyesight
RS500(E) lab laser. Variable focus, variable stabilised power from <0.5mw to 500mw +/- 5mw over 4 hours !
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800uW red diode and a couple of HeNe lasers with PSU issues. |
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Chief-Eamonn
Wicked Lasers God
Joined: 08 Jan 2007
Posts: 1734
Picture(s): 41
Movie(s): 15
Location: Western Australia
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| Posted: 4/02/07, 8:04 AM Post subject: |
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do it RoadRunner! go down to the local police station plug your RS in and start shooting people with it when they arrest you just say "you dont understand i was trying to terminate you!"  |
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RoadRunner
Wicked Lasers God
Joined: 05 Nov 2006
Posts: 2958
Picture(s): 1
Location: Scotland
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| Posted: 4/02/07, 8:08 AM Post subject: |
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How to terminate the beam of a laser...
Remove the power supply...
The RoadRunner..
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If y u are hav ng tro ble read ng th s , ma be you re suf eri g fr m laser ey -dam ge ! !! !!
Use the correct goggles and avoid eBaysers if you value your eyesight
RS500(E) lab laser. Variable focus, variable stabilised power from <0.5mw to 500mw +/- 5mw over 4 hours !
150mW Lab-Laser.
SUB 100mW Fusion (it actually peaked at 138mW - average 90mW) !!!
~8mW green eBayser.
BluRay Sonar - Pairs of CR123A batteries consumed: 8
Pulsar 125
100mw focussable Pulsar.
5mw Atlasnova 635nm, only 2.4mw. Mis-shaped spot, lots of spray. Worst laser I ever had.
800uW red diode and a couple of HeNe lasers with PSU issues. |
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Laser Ben
Wicked Lasers God
Joined: 26 Dec 2006
Posts: 1689
Picture(s): 376
Movie(s): 8
Location: Cupertino, California, USA
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| Posted: 4/02/07, 4:29 PM Post subject: |
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The industry standard and only cirtified way to terminate a beam is with a beamstop rated to four times the beams power. They are quite cool, I have one that is rated to 60W/square CM CW. It is extremly lartge and there is a matt black cone in the middle that reflects the beam towards the walls that absorbe the hear and are angled so no light can escape.
They can be expensive but you may be able to find a dcheaper one on eBay. They can also be called Beam Dumps and Beam Terminators.
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Ragnarok
Fusion Laser
Joined: 12 Nov 2006
Posts: 481
Picture(s): 6
Location: Hell, aka Bakersfield, California
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| Posted: 4/02/07, 8:50 PM Post subject: |
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Cheap and effective beam termination device: a stack of razor blades.
Last edited by Ragnarok on 4/02/07, 11:17 PM; edited 1 time in total |
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Napalm_Fire
Wicked Lasers God
Joined: 16 Oct 2006
Posts: 1303
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Movie(s): 5
Location: NJ
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| Posted: 4/02/07, 11:02 PM Post subject: |
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explain.. do you shine it into the blades? or the covering? huh?
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Ragnarok
Fusion Laser
Joined: 12 Nov 2006
Posts: 481
Picture(s): 6
Location: Hell, aka Bakersfield, California
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| Posted: 4/02/07, 11:16 PM Post subject: |
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| If you stack the blades, you'll notice that the side of the stack which is made up of only the sharp edges presents a surprisingly "black" appearance. Light entering this side of the stack encounters multiple reflection into the acute corners between the blades and is absorbed, and little to none reflects from the sharp edges. |
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Laser Ben
Wicked Lasers God
Joined: 26 Dec 2006
Posts: 1689
Picture(s): 376
Movie(s): 8
Location: Cupertino, California, USA
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| Posted: 4/04/07, 5:50 PM Post subject: |
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Neat! Gotta Try that.
EDIT: Dosn't work. Just shown it at a stack of 500 X-Acto Blades.
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DCDJ
Wicked Lasers Master
Joined: 15 Feb 2007
Posts: 764
Picture(s): 47
Movie(s): 17
Location: UK, Hertfordshire
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| Posted: 4/04/07, 5:59 PM Post subject: Re: safest |
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| RoadRunner wrote: |
| ixfd64 wrote: |
For the very high-powered lasers, what are safe ways to terminate the beam? I mean, if the beam hits a wall, the reflection could still damage eyes. Even white walls aren't safe from damage, given what RoadRunner has shown us.
And I know it's not a good idea to have a laser pointed in the sky constantly, as people might call the police, etc. |
A matt-black heatsink... You can terminate tens of Watts quite safely into a reasonable heatsink.
Alternatively, your local policeman. Just stand him in the beam and tell him to close his eyes..!!
The RoadRunner.. |
LOL! Policeman around here wouldn't like that lol.. 
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RoadRunner
Wicked Lasers God
Joined: 05 Nov 2006
Posts: 2958
Picture(s): 1
Location: Scotland
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| Posted: 4/04/07, 7:54 PM Post subject: Re: safest |
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| DCDJ wrote: |
| RoadRunner wrote: |
Alternatively, your local policeman. Just stand him in the beam and tell him to close his eyes..!!
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LOL! Policeman around here wouldn't like that lol.. |
Policemen around here don't like being told to open theirs..
The RoadRunner..
_________________
Click for my frequently updated gallery of available images...PM for a discount.
If y u are hav ng tro ble read ng th s , ma be you re suf eri g fr m laser ey -dam ge ! !! !!
Use the correct goggles and avoid eBaysers if you value your eyesight
RS500(E) lab laser. Variable focus, variable stabilised power from <0.5mw to 500mw +/- 5mw over 4 hours !
150mW Lab-Laser.
SUB 100mW Fusion (it actually peaked at 138mW - average 90mW) !!!
~8mW green eBayser.
BluRay Sonar - Pairs of CR123A batteries consumed: 8
Pulsar 125
100mw focussable Pulsar.
5mw Atlasnova 635nm, only 2.4mw. Mis-shaped spot, lots of spray. Worst laser I ever had.
800uW red diode and a couple of HeNe lasers with PSU issues. |
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Ragnarok
Fusion Laser
Joined: 12 Nov 2006
Posts: 481
Picture(s): 6
Location: Hell, aka Bakersfield, California
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| Posted: 4/05/07, 10:44 PM Post subject: |
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| Laser Ben wrote: |
| ... a stack of 500 X-Acto Blades. |
Five hundred?  What the heck kind of beam are you trying to block?!?
Garden variety blued steel straight razor blades seem to work fine for me. The spaces between could be coated with other more absorptive compounds though. Remember, it's not a super-duper lab style beam block design.
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d14852001neko
55mW Advanced Wicked Laser
Joined: 28 Nov 2005
Posts: 72
Location: Monterrey, México
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| Posted: 5/22/07, 8:25 PM Post subject: |
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how about using this?
||---------------------
||===================== beam
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that is, pointing the beam to a cylinder, if you want, made of carton, with one side being blocked with something opaque, that way, the light scattering would be enormously reduced.
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davhamm
Elite Laser
Joined: 08 Jan 2006
Posts: 146
Location: MI
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| Posted: 5/22/07, 11:29 PM Post subject: |
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How about putting the police officer on the stack of 500 razor blades?
Just send the beam into space. |
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