Your underlying motivatiopn to pooh-pooh makes you
seem like a fool.

It is the optical path that determines the divergence, or otherwise
of the beam, by dispersion, diffraction, refraction mechanisms,
and not the coherence of the radiation.

(Cue rejoinder by Mrs.Nugatory, given 5 minutes or so, to look
things up on google, to say that monochomatic radiation is
unaffected by a dispersive medium.)

Brian Reay wrote:
"Plod's Conscience" wrote in message
oups.com...

Allowing for the lens that is used to produce the
straight line beam, the spot from the end was
easily picked out on a gravestone 1/4 mile away,
thus suggesting that a tight beam is being produced.


Laser's are coherent sources, the "ASER" stands for Amplification by
Stimulated Emission of Radiation- the crucial phenomena in the operation of
lasers and masers. The emitted photon is in phase with the stimulating
photon.

"Plod's Conscience" wrote in message
ups.com...
Your underlying motivatiopn to pooh-pooh makes you
seem like a fool.


Someone offers you genuine information, on topic to your post, and you see
it as "pooh-pooh". I can see why you are a "slow learner", to use your own
description of yourself.

It is the optical path that determines the divergence, or otherwise
of the beam, by dispersion, diffraction, refraction mechanisms,
and not the coherence of the radiation.


Eh, no.

A laser will diverge in the absence of a medium.

Degree of collimation and coherence both are factors in divergence and you
are jumbling together a raft of factors that I supect you don't understand
and I know you don't want to learn about.

--
73
Brian
www.g8osn.org.uk

Your underlying motivation to pooh-pooh and to utter rather
silly and childish remarks makes you seem like a fool.

Why do you behave in that way?


Brian Reay wrote:
Someone offers you genuine information, on topic to your post, and you see
it as "pooh-pooh". I can see why you are a "slow learner", to use your own
description of yourself.

A laser will diverge in the absence of a medium.
Degree of collimation and coherence both are factors in divergence and you
are jumbling together a raft of factors that I supect you don't understand
and I know you don't want to learn about.

"The Baird system has been superceded by more modern techniques. In
fact,
unless you catch up quick, you may miss out a whole generation of
technical
improvements that have occured since "Stookie" "

An offer of genuine information?

Or the result of a deeply-seated motivation to want to cause
insult?

Stupid boy.

Brian Reay wrote:

Someone offers you genuine information, on topic to your post, and you see
it as "pooh-pooh". I can see why you are a "slow learner", to use your own
description of yourself.

Well, you're the expert in behaving like that, and as you
practised it for over 20 years, it probably accounts for
it being uppermost in your mind.

How come you never managed to pass a 12 WPM Morse
Test targetted at 14-year-olds in all that time?

Are you, perhaps, too lazy or too stupid, or both?

How come your objection to a Morse Code exam
being used as a filter to control access to HF suddenly
disappeared when a test down at your level, ie, targetted
at 6-year-olds, came along?

Hypocrisy, perhaps?

"Do as I say and not as I do", perhaps?

Bull****ting and downright lying, perhaps?

Is such two-faced behaviour that to be expected from
all directors of the RSCB?

Brian Reay wrote:
.....a raft of factors that I supect you don't understand
and I know you don't want to learn about.