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Old 12-24-2010, 07:56 PM #1
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Default Polycarbonate Window

Can i use a Polycarbonate 2,5mm window as safty for my 40w coherent brick laser. It's rated at 808nm.

I did some research but i,m not sure if it is enough. In the book "laser safety guide" they say it is used to block 10,6uM, but wil it block 808nm??

I also will we wearing 4od safety glasses from o-like. They are also rated for 808nm.


I found this on the web..

File:Polycarbonate IR transmission.png - Wikipedia, the free encyclopedia

A guide to laser safety - Google Boeken

Does anyone know?

Thanks

ronald


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Old 12-24-2010, 08:23 PM #2
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Default Re: Polycarbonate Window

No you cannot.

I find it OK that people ask for information and stuff, it's great learning experience.

But when people have graphs and information in front of them, how do you NOT see that on the graph, it says transmittance is around 90% for 860 nm, what do you think, it'll be 1% at 808nm?

It says like, right fukkin' there that it's used for CO2. Not 808nm diode lasers.

Ahh, end rant.

No, it's not usable. Look for actual 808nm protection, not 10600nm protection.
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Old 12-24-2010, 08:43 PM #3
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Default Re: Polycarbonate Window

It's not cheap but lasersafety has acrylic filter windows designed to cover a range of wavelengths, here's one that is OD7+ at 755-830nm Laser Safety Acrylic Windows - 000.01307.125 | Laservision (there's a real chance that diode bar is ~830nm anyways).

Last edited by Prototype; 12-24-2010 at 08:47 PM.
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Old 12-24-2010, 09:44 PM #4
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Default Re: Polycarbonate Window



Well there is a graph you provided. First thing you do is go over a little bit on the x-axis from 860nm. Then you see what % gets transfered by referring to the y-axis. Let take an estimate of 87% at 808nm. (based on the data from 860 to 1060). You have a 40w laser. 87% of 40w is 34.8w transmitted. FDA says anything over 0.005w isn't safe to the eye. So if the laser is shot through the plastic it will output 6800 times the safe limit (FDA limit) Now keep in mind there will only be a reflection. So lets say a meer 1% of the lasers power gets reflected 0.348w, that is still 70-times the safe limit.
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Old 12-26-2010, 08:31 AM #5
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Default Re: Polycarbonate Window

I posted this question because i thougt 808nm is close to co2 "10,6", as I read it as 1060 and in the graph 806 an 1060 have the same 90%.

But now i get is that it is 808nm and 10,6um.

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Old 12-26-2010, 01:45 PM #6
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Default Re: Polycarbonate Window

Yes, it's a whole order bigger ..... 10.6um = 10600nm

Always pay attention to the multipliers

And be careful also for the rest, not just for the eyes ..... 40W of IR can easily burn also your clothes and skin, if focused, not just your eyes ..... when working with these powers, a beam blocker and some safety shields are preferred .....
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