[Laser] Big adaptive optics

[Terry Morris W5TDM]

Well I said it was Saturday, my head was stuck at the focal plane, and point 
source. ;^)
The DynaLens is interesting, but it has been around a lot of years. 
Surprized it hasn't come
down in cost. This and sinilar devices have been around for some time.
http://patentpdf.net/US3608995.pdf

http://www.time.com/time/magazine/article/0,9171,838939,00.html

Terry w5tdm





>From: J Forster <jfor at quik.com>
>Reply-To: Free Space LASER Communications <laser at mailman.qth.net>
>To: Free Space LASER Communications <laser at mailman.qth.net>
>Subject: Re: [Laser] Big adaptive optics
>Date: Sat, 22 Sep 2007 15:02:11 -0400
>
>Well, if the optical element is double concave the amount of deflection of 
>the beam
>depends on where the beam goes through the lens. IMO, that would be 
>problematic for
>images.
>
>With two identical wedges, the net wedge depends on their relative 
>rotation. It goes
>from zero at 180 deg theta to twice the individual wedge at 0 deg theta. If 
>you rotate
>the pair of wedges together, the axis of deflection rotates.
>
>There is another option, the DynaLens, which used two flats and a fluid in 
>between, but
>it is very expansive.
>
>-John
>
>
>
>Terry Morris W5TDM wrote:
>
> > Well I would think if the optical element is DCC (double concave), and 
>they
> > are using tip/tilt that would give you 2-axis deflection. That would be 
>the
> > same as two rotating wedges. If my head is thinking straight today, that
> > would seem to form a wedge in all directions from the center of the 
>element.
> > The olny advantage 2 rotating wedges would have is one wedge could 
>cancel
> > the other wedge, I don;t see why you would need to do that cancel.
> >
> > But hey, its' Saturday and I may have my head on cancel ;0)
> >
> > Terry w5tdm
> >
> > >From: J Forster <jfor at quik.com>
> > >Reply-To: Free Space LASER Communications <laser at mailman.qth.net>
> > >To: Free Space LASER Communications <laser at mailman.qth.net>
> > >Subject: Re: [Laser] Big adaptive optics
> > >Date: Sat, 22 Sep 2007 13:15:46 -0400
> > >
> > >Thanks.
> > >
> > >It's interesting they chose to go the refractive approach but I don't 
>see
> > >how they can get two
> > >axis correction from a single hard glass element. If there were two
> > >rotating wedges, it'd be
> > >obvious.
> > >
> > >-John
> > >
> > >
> > >Terry Morris W5TDM wrote:
> > >
> > > > Opps, second link was wrong one.
> > > >
> > > > Try:http://www.sbig.com/products/ao-l.htm
> > > >
> > >
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