[Laser] Objective for laser opticsamplification.

[Chuck Houghton]

Surplus Shed has a 5 7/16 inch diameter DCX 525 MM FL with center hole 1
1/4 inch diameter hole avail for $12. It's not color corrected (one
element) but great in objective tests for color of system corrected for
at focus. There at www.surplusshed.com and it's there item # L1898, I
picked up several of them and making a new system using 6 inch PVC pipe
cap to hold lens (objective) and 6 inch reducer to 4 inch pipe for dual
system in development. Putting laser in center hole collimated well to
lense with a surplus focasing mech for beam expander we made out of pvc
using one of there 30 MM color corrected achromat's and a  ball lens for
laser end of system to couple into achromat. Chuck WB6IGP