From: "Mutalib Abdallah" 
To: IAPDK{at}ADMIN.DRAKE.EDU, atm{at}shore.net
Reply-To: "Mutalib Abdallah" 


Here is some weird, way-out thinking....    If a lens is of sufficiently low
power, it won't have much in the way of abberations because it will be very
thin.   I used to experiment with millimeter wave lenses made of spots of
metal embedded in styrofoam.   We found that we could build up several
layers, and the alignment of those layers did not matter much.   So, if it
works for mm waves, wny not for sub-micron (but not subspace) waves?


>From: IAPDK{at}ADMIN.DRAKE.EDU
>Reply-To: IAPDK{at}ADMIN.DRAKE.EDU
>To: atm{at}shore.net
>Subject: Re: ATM Holographic Objective Lens?
>Date: Fri, 27 Jun 2003 16:58:54 -0500 (CDT)
>
>
> >  Someday, when you want to use a refractor, maybe you can just flick  on
>a
> > swith and the lens would be projected with 0 wavefront error and fully
> > multi-coated (holographically). Is this technology possible someday?
>What do
> > you think?? >>
>
>Silver-grain photography runs something like this: tiny grains of
>transparent silver salts are exposed to light causing them to change
>to opague.  You can record nearly any pattern of transparency and
>darkness including a holographic diffraction pattern.  You could create
>a concentric ring pattern that would concentrate collimated light energy
>into
>a spot at some distance from the film, but it won't be an image.
>
>If you could control the refractive index of the grains or the emulsion,
>or make them reflective and control their orientation, then you could
>do what you want - make a fresnel-type lens or mirror, but it would not
>be a hologram.
>
>Maybe... if you made a flat container by sealing the edges of two
>flat glass plates, filled it with a gel solution containing charged
>reflective particles, suspended it between balanced static fields, and
>slowly spun it while it gelled...
>
>Paul Kline
>

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