I took your advise and used a hard plastic smurf this time in one of my exposures. (they don't make them like they used to...:)and there is no fringing this time So I guess there was some back reflection going on in previous exposures using more shiny objects.It only happened with that one object (round shiny metal lighter). So I believe it is the object that somehow is not stable. I would surgest you try other objects.
I also used Brewster's angle as accurate as I could. Of course the plate was slightly tilted against the smurf but i tried to compensate with the laser angle.. And I used the rechargeable batteries to power the laser
The plate was resting against the figure which I taped to the table with double tape..maybe super glue would have been better.
exposure was 1 minute, rinsing 20 sec., developing 2 minutes, rinsing 3 minutes, bleach about 1 minute plus 20 seconds, and rinsing for another 3 minutes. And finally spray painted the back the next day.
Thanks Joe for pointing out the backreflection phenomena..But I'll try to shoot some shiny objects using the same set up..
Haven't tried this yet.. I did see some videos where they use this to boost the power of the laser to be able to burn holes in things..what does the pot actually do? Does it make brighter holograms, or would it increase coherence length? ..or would it only make the laser unstableIf you look at the board there is a pot. Turn the power down slightly. I have not had to do this but it would be my first idea
the best two holo's so far in one shot:
Maybe I'll do some more tests tomorrow. At least I got to make a hologram without the fringing this time