Hey there:
How good are you at glassblowing? /ubbthreads/images/graemlins/wink.gif
The easiest gas laser to make from scratch is a nitrogen laser.
The easiest DPSSFD laser to manufacturer from existing components is a 532nM unit.
I would say you need to read sams laserfaq, however if you are seriously contemplating this you will need to absorb the laserfaq.
I will admit, if you built a laser for a school science fair you would almost be a shoe in for 1st place... Potato clocks are so boring /ubbthreads/images/graemlins/wink.gif
The easiest