[Laser] Big adaptive optics

[J Forster]

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
> > >
> >
> >_______________________________________________
> >Laser mailing list
> >Laser at mailman.qth.net
> >http://mailman.qth.net/mailman/listinfo/laser
>
> _________________________________________________________________
> Discover sweet stuff waiting for you at the Messenger Cafe.  Claim your
> treat today!
> http://www.cafemessenger.com/info/info_sweetstuff.html?ocid=TXT_TAGHM_SeptHMtagline2
>
> _______________________________________________
> Laser mailing list
> Laser at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/laser