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I've never used 4:1, I've always tried to get to 1:1 or close to it. The maths shows you get the highest modulation with 1:1. Thanks. I've also tried for 1:1, but thought there might be something unusual about DCG due to the wide dynamic range when combined with something like a 4:1 ratio. I guess ...

There is a thread on this forum called "Single beam transmission" which is from 2013. If you haven't seen it, use the search function for "Single beam transmission" (with quotes) to find it. I've never done one myself, but they used to teach this method at the Fine Arts Research ...

I was reading an old post by a forum member who said his rule of thumb exposure ratio for Denisyuk DCG was 4:1 (ref./obj.). He said that lower ratios (i.e., more object light) result in excess noise (for display holograms). Actually, this does make sense to me, since intermodulation noise can be pre...

My memory is a bit fuzzy going back to the 80's, but at that time the Chicago MOH had quite a few Walter Spierings holograms. He certainly could make big, bright ones. I'm fairly certain I saw one of the microscope holograms. Apparently, more than one type of microscope hologram was made by him. The...

In terms of over-spill on the plate, I made sure that the collimator 'saw' white light, so any overspill went beyond the collimator, or the plate if you're not using a collimator. Thanks, at least I know I'm not alone. (Thanks also for the detailed comments.) I've found the beam combination issue t...

I wasn't asking you personally to make a video, I just said I would like to see it. I'm certainly not expecting for this to ever happen, that's why I included a As for literature on the subject, I've never seen it discussed, either in a cursory way or in-depth.

What I would like to see is a YouTube video showing the table, lasers, telescope lenses, and spatial filter. With the initial divergence of each laser stated, the type of each lens in each telescope, each focal length, the distances from the laser apertures to the first lens of each telescope, and t...