Beam expanders?

[Paul0759]

Anyone know of any good videos of lasers with beam expanders at great distances?

 

[Cyparagon]

It's an old one, but still neat:

edit: embed seems to be misbehaving.

http://www.youtube.com/watch?v=_9QotAtxrmc

 

[Kevlar]

Ok. A beam expander is officially now on my "needs" list! :drool:

 

[hakzaw1]

here are some BE vids-these are on the GB for reasonable prices.

‪beam expander jetlasers‬‏ - YouTube

 

[ARG]

What exactly do beam expanders do? just improve the divergence?

 

[CDHDC]

It's an old one, but still neat:

edit: embed seems to be misbehaving.

‪Laser Igniter 300 Feet‬‏ - YouTube

I love that vid. This was the one I was thinking of when I read the original post

 

[Moebius]

This one's my favorite. I find it very relaxing.