diffraction grating suppliers

"John Carruthers" wrote in message
...
Have you tried Edmund scientific ?
jc
I don't think they go that 'coarse'. When I last looked, about 500lpmm for
the polyester gratings.
Have a look at 'Knight optical'. They do a commercial 100lpmm grating,
that is 65*50mm, for under £20. They also do a huge range of other stuff,
and you can order directly off their website. They are friendly, and
useful for all sorts of optical bits...
http://www.knightoptical.co.uk/acata...alRange444.htm

Best Wishes