On May 27, 9:10*pm, lu6etj wrote:
1) I did not think of (or is think on?) a laser source, I was one step
before, I think only of a "coherent" source to match monofrequency
simple AC generator analogy.

Let's consider an *ideal* single-frequency laser to be a coherent
monofrequency source for the purposes of discussion.

2) What would be Rs optical analog?

I don't know enough about lasers to answer that question. In any case,
I don't think reflections incident upon a laser encounter whatever Rs
that might exist. I think we are going to have to settle for what
happens outside of the laser which in important because what happens
to photons in free space and other mediums cannot be hidden inside a
transmission line. Standing waves of photons cannot stand still in a
coaxial transmission line any better than they can stand still in free
space.

What some people are missing is that visible light waves and RF waves
are exactly the same phenomena, just at a different frequency. The
laws of physics governing light waves also govern RF waves. When
someone says, "RF waves are different from light waves" or "RF waves
can stand still", they are just showing their ignorance. They must
also prove that reflected visible light waves in free space contain no
energy and can stand still or else they are just blowing smoke.

3) Superposition is a medium phenomenon ¿yes?, for example "eter".
Interference an result of it on a other "thing", for example
photographic plate or screen. Are we agree? K

No, in our context, superposition is the merging of two or more EM
waves in any medium. If the waves are coherent, constructive/
destructive interference can occur. If partial or complete wave
cancellation (permanent destructive interference) occurs, then the
energy in the waves that existed before cancellation must be
redistributed in another direction AND there are only two directions
in an RF transmission line.

I believe that Walter Maxwell defines any reversal in direction of
reflected energy flow in a transmission line to be a "re-reflection".
I prefer to call what happens to a single reflected wave a 1. "re-
reflection" and what happens when two waves cancel a 2.
"redistribution" of reflected energy.

What about the third point? I consider it important because
light waves are in three dimensional space, ...

Let's compare coax with 0.2 square inches of cross-sectional area to a
laser beam with 0.2 square inches of cross-sectional area. For the
same power level, the power density, watts/in^2, will be the same -
therefore the Poynting vectors will be the same. With such a concept
in place, we can talk about a 100w RF source or a 100w laser source.
--
73, Cecil, w5dxp.com