by Joe Farina » Fri May 26, 2023 12:08 pm
Din,
Thanks very much for your help. I will try to get that paper soon. Also, I appreciate your earlier comments on how to reduce scatter. In my recent holograms, I was making a big error with regards to baffling. Not with stray light from my optics (at least I don't think so), but rather with my test-objects, which have been ceramic plate-holder/object support assemblies. The stray light from the ceramic support was going everywhere. I'm in the process of painting every possible surface (except for the object) matt black. By the way, a good velvet-black water based (casein) paint is available at:
https://www.dickblick.com/products/peli ... ka%20black
Also, if anyone else in the forum is interested in vacuum de-airing of either epoxy (recommended for Hxtal) or gelatin, I just found and ordered the following:
https://www.sterlitech.com/rocker-410-o ... -pump.html
It's oil-free, relatively inexpensive, and, according to the specs, can pull a vacuum of around 29 inches of mercury. I was impressed with the price/specs, plus the oil-free aspect is very attractive. No oily fumes or backflow to worry about. I'll see how it goes. (The shipping time is incorrect in the above link, I checked with more than one supplier, and the earliest delivery time is in mid-July. Looks like these may be in demand.)
Din,
Thanks very much for your help. I will try to get that paper soon. Also, I appreciate your earlier comments on how to reduce scatter. In my recent holograms, I was making a big error with regards to baffling. Not with stray light from my optics (at least I don't think so), but rather with my test-objects, which have been ceramic plate-holder/object support assemblies. The stray light from the ceramic support was going everywhere. I'm in the process of painting every possible surface (except for the object) matt black. By the way, a good velvet-black water based (casein) paint is available at:
https://www.dickblick.com/products/pelikan-plaka-paint/?fromSearch=%2Fsearch%2F%3Fsearchword%3Dplaka%20black
Also, if anyone else in the forum is interested in vacuum de-airing of either epoxy (recommended for Hxtal) or gelatin, I just found and ordered the following:
https://www.sterlitech.com/rocker-410-oil-free-vacuum-pump.html
It's oil-free, relatively inexpensive, and, according to the specs, can pull a vacuum of around 29 inches of mercury. I was impressed with the price/specs, plus the oil-free aspect is very attractive. No oily fumes or backflow to worry about. I'll see how it goes. (The shipping time is incorrect in the above link, I checked with more than one supplier, and the earliest delivery time is in mid-July. Looks like these may be in demand.)