P3D Re Home Holography

[Peter Homer <P.J.Homer@xxxxxxxxxxxxx>]

>I know we are not supposed to discuss holography in this group but the
>references to it by Greg Wageman and Erker were of some interest to me as I
>have done some holography myself.Strictly speaking it was done in my lunch
>time at work because I have access to a laser there, rather than at home .
>But the set up was much simpler than they suggest ,the laser was just 1mw
>mounted on an optical bench (essentialy a heavy piece of angle iron)  with
>all the components mounted in line with it there was no beamsplitter. Just
>a compur type camera shutter followed by a x40 or x100 microscope objective
>then the plate held at about 45 degrees with the object propped against it
>on the other side .So that the light passed through the plate to the object
>and was reflected off it back onto the plate. This produced a hologram that
>could be viewed in ordinary light without the laser ,the exposure was about
>10 minutes on dichromated gelatin emulsion made up by myself from a recipe
>of Jeff Blyths published in Holographics  International and coated onto
>perspex. As I wanted to put the results in a stereoscopic print folio . I
>could carry the whole arrangment myself except for the ordinary solid table
>I placed it on. The problem was preserving the images dichromated gelatin
>holograms are unstable and disapear if they absorb moisture normaly they
>are sealed with another plate once thoroughly dried of water but I found I
>had to seal them in the final bath of rubbing (Isopropyl?) alcohol . Rough
>handling in the post meant only the imediate person on route to me ever saw
>the results. The ones I kept lasted longer the best being about a year I
>have none left now. P.J.Homer




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