Richard Clark wrote:

On Fri, 19 May 2006 15:08:11 GMT, "Tom Donaly"
wrote:


Stokes' law and the Raman effect can be found in
physics texts dealing with quantum mechanics. Georg Joos, in
his book _Theoretical Physics_ deals with such things. The reading
is dense but the underlying concepts aren't too difficult. The
difficulty might lie in understanding how they apply to this
discussion.


Hi Tom,

Certainly Joos would give some entry into the field, but finding work
as accessible outside of a bookstore or library (in other words,
through a search engine) makes for drinking out of a fire hose to
quench a sip's worth of thirst.

Insofar as HOW this applies, I've spoken to that and Tom shows
interest. That alone goes beyond the typical churning that passes for
discussion. The point is that these underlying concepts are fairly
simple as you imply and they are certainly not remote from the usual
topics of consideration here. What they lack is specifics that relate
to our common applications, and there too I've offered discussion.
However, few seem inspired to travel those paths and that fault can
hardly be laid at my doorstep.

73's
Richard Clark, KB7QHC

And a web search produced a couple very good links out of the first 20.
One was a great discussion of problems in long optical fibers, and
some relatively simple ways to work around some of them, or at least to
mitigate them.

tom
K0TAR

On Fri, 19 May 2006 14:24:07 -0500, Tom Ring
wrote:
And a web search produced a couple very good links out of the first 20.
One was a great discussion of problems in long optical fibers, and
some relatively simple ways to work around some of them, or at least to
mitigate them.

Hi Tom,

In my early days in this game (late 80s), I sought to turn lemons into
quantum-aide. That is, I sought erbium doped fiber optics to amplify
nanowatt fluorescence signals with 10 to 50 µS decay times. Not one
of those off-the-shelf commodities, however; so I had to amplify in
the conventional way with an PMT.

For those interested, long haul communications fiber optics
(transoceanic grade) met with the same requirements for amplifiers
placed along the length to maintain S+N/N. Erbium doped fibers were
projected as a solution. You could pulse UV into the fiber to charge
it, and a IR data pulse would be amplified, continuously along its
length. The IR data pulse would be boosted by the previous charge of
energy. This is an example of forward Raman scattering and is called
Raman Amplification (which at the time would have been about 30dB and
10% efficient).

73's
Richard Clark, KB7QHC