[time-nuts] advice

[Hal Murray]

bruce.griffiths at xtra.co.nz said:
> If you have a dark fiber or 2 between the surface and the lab and a pair of
> sufficiently stable lasers (one at the surface and one in the underground
> lab) you could look at the change in beat frequency between the lasers
> (around 50Hz for a pair of red lasers). 

Interesting idea.  Thanks.

How stable is a good laser and/or how hard do I have to work (or how much do 
I have to pay) to get one stable enough for this experiment?  What's the line 
width on a typical laser?  How much does it wander with temperature and 
supply voltage and phase of the moon?


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