which glass for laser window in case

[michelrietveld]

hi, building my first projector and the question raised what type of glass to use for the front window where the laser will go from inside to outside.
I have been looking at the local glass shop for non-reflective glass, is this good enough?
this is also used to frame photo's on the wall.

Michel

[LaNeK779]

you should go for BK7 glass, broadband (400nm-700nm) AR coated glass
but it may prove hard to find and/or expensive...


(by the way, if you find it online, do post a link. i will be needing one, at some time from now)

[dsli_jon]

Hey Gents -

(by the way, if you find it online, do post a link. i will be needing one, at some time from now)

Unless you're using an ungodly-amount of 405nm "CDAR" by Edmund Optics is the 'cats-pajamas' - available in all sorts of sizes, and even larger-plates, you can 'cut down' yourself... here's a post I did awhile back about the stuff, with a link, etc -

http://www.photonlexicon.com/forums/...627#post148627

Hope this helps, m8's...
cheers..
j

[LaNeK779]

hey, never saw a cat in pajamas... and a very nice price for them, too. definately worth a try. i suggested bk7, only because of the 445. but since only 405 is affected and i have no 405 installed i'm fine


i read that back reflections are effectively eliminated. but still, do you think it's a good idea to mount the window just slightly tilted (just a tiny bit), so what's left of the back reflections is directed elsewhere? edit here--> reading your older post, point taken, tilt is the way to go. thanks

thanks for your hints dsli_john

[dsli_jon]

hey, never saw a cat in pajamas...

Your GF doesn't ever wear lingerie? jk...

thanks for your hints dsli_john

U bet... ...but who's "John"?

cheers...
j

[LaNeK779]

oh, we've been around each other for some time, so all the fancy lingerie is stuffed away in a drawer by now. nowadays all i see is some unidentified creature moving around covered in a blanket








i realised the surplus "h" in john a bit too late, sorry, my bad. jon from now on

[dsli_jon]

nowadays all i see is some unidentified creature moving around covered in a blanket

Oh wow, you guys have a Ferret?? Cool!

i realised the surplus "h" in john a bit too late, sorry, my bad.

no worries, I was only teasin' ya...

cheers...
j

[JohnYayas]

I use a camera lens filter on my projector and epoxied an adapter ring to the front. This allows me to easily remove the filter glass by unscrewing it. If it gets dirty I can unscrew it and clean it. Or, if it is really dirty I can throw it in the trash and buy another for $30 or so.

[LaNeK779]

Oh wow, you guys have a Ferret?? Cool!

cats and ferrets....

sneaky little thing there

http://www.youtube.com/watch?v=6_vtM6qANiI