Bruce Griffiths wrote:
Poul-Henning Kamp wrote:
In message<4b0b0ed6.3080...@xtra.co.nz>, Bruce Griffiths writes:
This lamp wear out mechanism is avoided if one uses laser interrogation
of the absorption cell.
About that...
Isn't that the sort of experiement we should try to lure Tom into
doing ?
There must be a way to create a DIY conversion of old Rb's to laser...
Poul-Henning
As in:
http://tf.nist.gov/timefreq/general/pdf/2232.pdf
Which uses injection locking to avoid generating the 6.834...GHz
signal directly
Bruce
Another method which may be more directly applicable when attempting to
resuse some of the electronics in an rubidium standard whose rubidium
lamp has failed:
http://physweb.bgu.ac.il/SUBMISSIONS/PROJECTS/Liorne_Benh_2008A.pdf
Note that one needs to use 2 rubidium 87 cells, one to lock the laser to
the required transition, and the other to lock the microwave source to
the Rb87 hyperfine transition.
Also one needs to use a tunable laser (ECDL-external cavity laser).
Although angle cleaved laser chips are best it is actually possible to
construct a satisfactory ECDL with an inexpensive diode laser without
anti-reflection coatings or angle cleaved facets.
Bruce
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