Denny,

There is a group here in New Zealand that has a fancy ring laser in
an old WWII bomb shelter.  They have shown that it is capable of 
recording seismically generated rotations.  It's not the sort of 
laser you could build at home and the papers that they list are 
rather technical but there are some good pictures of the laser and
the "cave".  Their main web site is

http://www.phys.canterbury.ac.nz/~physges/
 
Cheers,

John


Denny Goodwin wrote:
> 
> Anyone using lasers for detection - if so, how?
> 



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