Laser window advice

[jose_arzuza]

hi everyone! i recently bought a blue laser of 40w 450nm, i am using a 6+ glasses, but and my partner is using the 4+ glasses, i have thinking of using the machine a lot, so i want to have a super secure system, i make a enclosed system for my laser machine, i want to put a panel in top of the enclosed system so i can monitoraded the machine, off course even with this panel i will still use my glasses, i have two options in mind, one is the “Acrylic Sheet - Class 4 Viewing - 410”, that specs are: “410 is an Acrylic laser filter window offering protection primarily from 190-532 nm and 10,600 nm lasers.” it cost the panel of 12x12 inch $150, and the second option if the “Low Power Viewing 920”, that specs are protects from certain laser wavelengths and proves a maximum optical density of 4+. This laser safety windows offers protection primarily from Class 2 and Class 3 laser systems operating between 360-610 nm. , this one cost $55 the 12x12 panel, so i want to buy that one, but i don’t know if that if good for my laser or i should but the firts that is 3 times more expensive, thanks a lot for your help

[mcdanlj (Michael K Johnson)]

It looks like you might have posted about this multiple times? I recommended the discussion of the Engravinator:

New Open Source Laser Engraver Design

No question, just showing off [image] Been working for most of the year on a new laser engraver that I designed in collaboration with a friend who’s a woodworker. Unlike most of the diode engravers it’s designed to be small, lightweight, and portable so that it can be brought to the work piece instead of the other way around. This way you can engrave onto very large pieces. Though, of course it works with smaller things as well. It’s entirely open source and heavily uses 3D pr…

Also you might find some relevant tidbits in this thread where I was looking for information specific to far-IR CO2 lasers:

Why orange plastic for CO2 lasers?

I see that a lot of CO2 laser cutters ship with orange-toned plastic windows. Orange tint for blue lasers makes total sense to me. But for an infrared laser, I don’t see what the benefit could be. Given that clear glass and plastic absorb infrared so well that CO2 lasers engrave them, is there any value to tint? If there is, wouldn’t a blue tint be more likely to provide additional absorption? It has been my assumption for Project monocle that clear acrylic or polycarbonate would be fine for t…

[jose_arzuza]

Hi Mcdanlj, sorry i am a bit noob with this post and forums, i believe that my post was hidden (i get a notificaction that my post was hidden due to “spam” i assume that the page do this becouse i put the link to the laser windows ) so i think that nobody can see that post so i created again! thanks for share the information about the engravinator, however i have a doubt with my laser, becouse i was think if my laser if a 4 class or a 3 class, i assume that is a 3 class becouse is a 40w lasser and 450nm, so i was think that the option "Low Power Viewing 920”, that specs are: “protects from certain laser wavelengths and proves a maximum optical density of 4+. This laser safety windows offers protection primarily from Class 2 and Class 3 laser systems operating between 360-610 nm”. i think that should work for my lasser right ? that windows cost 45$ and the option that is made for 4 class laser, cost 145$ i don’t know what you think is the best option, thanks!!

[donkjr (Don Kleinschnitz Jr.)]

I seriously doubt your laser diode is 40W of optical power. That is likely the input power.
I doubt you are running more than 5-10W of optical power.

[jose_arzuza]

i doubt too, for the moment i am using the laser to cut 4mm plywood, and it does good, with one pass.

so i think i can go for the second option ( i still going to use my glasses to even look throught that window )

the second option specs are ““Low Power Viewing 920”, that specs are protects from certain laser wavelengths and proves a maximum optical density of 4+. This laser safety windows offers protection primarily from Class 2 and Class 3 laser systems operating between 360-610 nm”