So your water temperature seems to be too high. With my standard FEG gelatin I usually can't go higher than 30C.vasimv wrote: ↑Tue May 28, 2019 9:37 amWithout fixer a lot of emulsion gets washed off in water. And wasn't able to get something near that without warm water.Congratulations! That looks very promising. The white color of the dry layer seems to indicate some layer damage. Maybe the water was simply too warm?
I'd skip the potassium aluminium sulfate step.
Note also that when you insert your plate into the water right after the H2O2 step the gelatin becomes very vulnerable to damage.
To prevent that you might use COLD water (<20C) to remove the H2O2. Only then you'd use a water (swelling) bath at 25-30C. But that temperature depends on your type of gelatin of course. For broadband reconstruction to have to go right to the threshold temperature (the temperature the gelatin can take without damage). You then could directly apply 100% alcohol for dehydration. I didn't notice much of a difference between ethanol and isopropyl alcohol. So I stayed with the much cheaper ethanol.
I'm familiar with that problem. I never had a 405nm laser with more than 2mm coherence length. I keep looking for a 405nm laser with reasonable coherence length and a reasonable price (the Ondax lasers seem a bit over the top in that regard).Failed to get anything useful with my 405nm at bigger depth, must be really bad laser - only few millimeters deep and nothing visible after.
I also use a transmission grating on top of my recording materials. Usually this comes on top of a coin also. So I can record a reflection and transmission hologram at the same time.A bit confused. Couldn't get a reflective hologram but did copy a transmission one with 405nm laser (the master was made with red laser on litiholo film, i just placed the film on FAC emulsion plate under beam to get direct transmission copy).
Yes, layer thickness difference may be an issue (e.g. too much FAC or a not entirely dry layer before recording).Perhaps i did something wrong as i see only small part of it at weird replay angle (with any laser) but did work still, it has original's depth and reflections from sides when i look from different angles. Not sure why i keep failing with reflective holograms, may be it is layer's thickness or my processing method.