Different types of diffraction gratings....

I just got a diffraction grating today that produces a starburst-type pattern, which will be really cool as soon as I get a fogger, but I'm also looking for one that will make a fan pattern. I have checked around on Ebay (where I got the starburst one from) but nothing there. Anyone know where I can get a diffraction grating that will make a fan effect?

Cool! Thanks for the link.

Dragon Lasers have glass ones at like half the price...

http://www.dragonlasers.com/catalog/Diffraction-Grating-Transmission-Beam-Fan-p-16228.html

That isn't quite what I expected for a "fan" type grating. That must be the type I pulled out of the 360 HD-DVD drive I took apart.

Here is a picture I took with the grating from the 360 drive. I took it looking down the hallway in my apartment. The other end was about 35 feet away.