Laser diodes can have coherence lengths over 50 meters. An Infiniter 200 laser pointer can make a hologram and costs less than $10 and has a coherence length of around 6".
Some useful links if you want to go on from here:
www.hologrphyforum.org (mine)
www.integraf.com (film and supplies)
www.holoworld.com
Slashdot Mirror
Just for reference:
Laser diodes can have coherence lengths over 50 meters. An Infiniter 200 laser pointer can make a hologram and costs less than $10 and has a coherence length of around 6".
Some useful links if you want to go on from here:
www.hologrphyforum.org (mine)
www.integraf.com (film and supplies)
www.holoworld.com
And yes, I have used the Liti kit.