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clean spread of beam,

Beam spread by fiber optic lens http://www.surplusshed.com/pages/item/l3172.html

Beam optics

this is my wwork on 445nm beam profile

crack head or a bubble-ist! maybe its both, some of the bubble's crack under the stress put on them by holographer
thus creating noise in the gel. so the trick is to crack or not to crack

in simple form the Refraction of air and gel is different, basically you have harden and soften parts of the gel, when you dehydrate the gel it leaves air bubbles left where the water was, so that ther is a Refraction diffrence between the two ther by changing the phase. so this type of hologram is ...

It would appear to me to make more sense to categorize future Holoforum topics as: Step 1: H1 (mastering) which would include image composition and lighting and Step 2: H2 (image planing) to include beam rationing, photochemistry and processing. As a very active (and upbeat) display holographer I a...

The aberrations of an image are directly dependent on the distance from the image plane. These aberrations are caused by many factors including a mismatch of the light source used for reconstruction and the angle of the reconstructing light. As the image moves away from the image plane, these aberr...

Gypsum plaster , a building and modeling material, would likely dehydrate IPA. As building material it is easily available and very cheap. Gypsum plaster is "Calcium Sulphate hemi-hydrate". Pour some plaster powder in the IPA bottle, shake well and let them react. 290 g plaster will absor...

Joe Farina wrote:These are a couple pages from the notes for a class given by Richard Rallison, on the subject of film preparation and "pits."

can you repost this? tried to print it but way to small