Re: Solar powered lasers in space

On Sep 19, 9:30 am, Willie.Moo...@xxxxxxxxx wrote:

Right. That's the point of the pilot beam from the target. You can
set it up so that a 'seed' beam as you called it, could be used as a
reference. Basic holography really - and that reference could direct
the energy to another point. But to my way of thinking a pilot beam
FROM the target is a simple solution.

A beam from the target won't provide useful phase information,
unless combined with other reference beams. Holography
works only if the hologram in question is perfectly rigid to
within the wavelength divided by 4*sin(theta/2) (where theta is
the diffraction angle). With a pilot beam from the target,
this means the array must be rigid within 1/4 the wavelength.
But if the array is that rigid, then you really don't need the
pilot beam at all.

Contrast this with a gabor zone plate lens, combined with
a far away "seed laser" drone behind the lens. In this case,
the diffraction angle is very nearly zero. Thus, the lens
does not need to be very rigid in order to efficiently
function. (A gabor zone plate is a hologram.)

If you use multiple reference beams, each in rigid formation
to within 1/4 wavelength, then it's possible to integrate the
beam information in a way to get perfect phase alignment
in any direction. This requires active processing, rather
than a passive hologram.

Isaac Kuo

.

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