[email protected] 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? -- These are my opinions. I hate spam. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
