Haven't posted here in a while!
One of my better and more recent holograms:
Pic:
Video:
https://www.youtube.com/watch?v=1cIGXvEQpUc
Some more:
- Experimenting with depth: https://www.youtube.com/watch?v=7dqZ5bj5tvg
- Kind of a nice figurine (overexposed in the middle? underexposed? hmm) https://www.youtube.com/watch?v=n7EuEWkOs4A
488nm / ~175mW
I capture a video of each hologram that I make, so check out my channel if you want to see a bunch of really bad holograms
Chinese figurines and random stuff
Chinese figurines and random stuff
Last edited by pluto on Mon Aug 13, 2018 10:12 pm, edited 1 time in total.
Re: Chinese figurines and random stuff
Nice job pluto.
Narrowband and low noise.
Narrowband and low noise.
Success through failure - the amateur DCG holographer's path to enlightenment.
Re: Chinese figurines and random stuff
Pluto, It looks amazing.
What gelatin do you use? What do you do to get it so sharp ? Can you post your procedure?
What gelatin do you use? What do you do to get it so sharp ? Can you post your procedure?
Re: Chinese figurines and random stuff
I think you contacted me by private message, but here's my response for posterity:
1) Water wash for 60-90 seconds (~20c)
2) 70% IPA bath for with gentle agitation for 60 seconds (~20c)
3) 99% IPA bath with gentle agitation for 60-90 seconds (~20c, sometimes up to 30c)
I dry with a heat gun. Depending on how the hologram turns out after drying with moderate heat, sometimes I turn it to the hottest setting and heat it up very hot. This has produced brighter results at times, but also more noise.
I take a quite a lazy approach to holography... doing everything extremely carefully sometimes makes making holograms a bit tedious and takes the fun away. The way I see it, I'm experimenting with different parameters, and once I feel I understand how they affect the final result, then I will take the time to try to make a really nice hologram.
And some answers to emailed questions if anybody is curious:I use Knox gelatin. Let me just list some things about my setup.
I use a 488nm 200mW laser, often exposing at 150mW or so. My DCG formula is 200-21-1.5 (water-gelatin-potassium dichromate)
YesAre you using the supermarket knox?
It's just what I ordered initially. AmDi is supposedly a bit more sensitive -- I may order some soon. NaDi is meant to be better than KDi as well, more soluble I think?I am using AmDi, Why do you use KDi? What do you think of NaDi?
I do veil coating. I heat up the glass plate with a heat gun to ~40C, then coat the glass plate. I rotate the plate a little bit, but I don't spin. Very lazy technique -- probably the cause of most of the imperfections in my holograms.I am doing the dip method. Mold coating, Dip in 3% Amdi solution for 1min.
I don't use fixer -- perhaps I should. I experiment with temperatures and concentrations, but typically I do:What is the develop steps? Fixer, IPA concentration and time? I do 68%, 99% 100% all in ambient temp
1) Water wash for 60-90 seconds (~20c)
2) 70% IPA bath for with gentle agitation for 60 seconds (~20c)
3) 99% IPA bath with gentle agitation for 60-90 seconds (~20c, sometimes up to 30c)
I dry with a heat gun. Depending on how the hologram turns out after drying with moderate heat, sometimes I turn it to the hottest setting and heat it up very hot. This has produced brighter results at times, but also more noise.
I believe this is because of internal reflections in the glass. I don't mask off the edges, so at the steep angle you see the reflection from the laser hitting the side of the glass.Haze in the middle, when you view the hologram in a large angle, you see whitish haze, not crystal clear.
I take a quite a lazy approach to holography... doing everything extremely carefully sometimes makes making holograms a bit tedious and takes the fun away. The way I see it, I'm experimenting with different parameters, and once I feel I understand how they affect the final result, then I will take the time to try to make a really nice hologram.
Re: Chinese figurines and random stuff
Hi,
The hologram looks nice and crisp.
May I ask what light you are using to reconstruct the hologram.
Thank you
Grayham
The hologram looks nice and crisp.
May I ask what light you are using to reconstruct the hologram.
Thank you
Grayham