Joe Farina wrote:Very nice indeed, Steven, congratulations. Thanks for clearly detailing the processing steps, your technique is interesting. The image is crisp and "hard," real-looking rather than ghostly. The reconstruction looks quite narrowband and close to the recording wavelength. Those qualities are especially sought after in color DCG. If you're doing single-wavelength holograms of shallow objects, the broadband regime would be nice also. It looks like the long dark reaction was of some benefit.
Many thanks for your comments Joe.
A bit of explanation, re my process. The swelling bath consists of a 3ltr deep fat fryer, water pump, temperature sensor, photo developing tray and a PID temperature controller, the latter powers the deep fat fryer. In all the system holds about a gallon (UK) of water, so I don't put wetting agent in it. Besides, it would just make lots of bubbles
Heated water from the fryer is pumped up to the photo developing tray (containing the hologram) and flows back over the edge of the tilted tray into the deep fat fryer. It's a bit Heath Robinson, but it works very well. The only thermometers I need to use are for the other photo developing tray containing the DI water with wetting agent and the IPA baths in clip&lock containers.
Yes, the hologram is quite narrow band and crisp, which was what I was aiming for. The camera doesn't do it justice.
It also helps to have small diameter reconstructing light source. The 3 Watt LED is quite good in that respect, but it's not very bright.
The depth of the hologram is about 3/4" or so. I have made relatively broadband holograms using this fixture, but it results in more colour dispersion.
I like my holograms to be crisp and clear so that fine details can be seen, even at the cost of brightness.
"Those qualities are especially sought after in color DCG"
That's my aim and I'm working on it
[quote="Joe Farina"]Very nice indeed, Steven, congratulations. Thanks for clearly detailing the processing steps, your technique is interesting. The image is crisp and "hard," real-looking rather than ghostly. The reconstruction looks quite narrowband and close to the recording wavelength. Those qualities are especially sought after in color DCG. If you're doing single-wavelength holograms of shallow objects, the broadband regime would be nice also. It looks like the long dark reaction was of some benefit.[/quote]
Many thanks for your comments Joe.
A bit of explanation, re my process. The swelling bath consists of a 3ltr deep fat fryer, water pump, temperature sensor, photo developing tray and a PID temperature controller, the latter powers the deep fat fryer. In all the system holds about a gallon (UK) of water, so I don't put wetting agent in it. Besides, it would just make lots of bubbles :) Heated water from the fryer is pumped up to the photo developing tray (containing the hologram) and flows back over the edge of the tilted tray into the deep fat fryer. It's a bit Heath Robinson, but it works very well. The only thermometers I need to use are for the other photo developing tray containing the DI water with wetting agent and the IPA baths in clip&lock containers.
Yes, the hologram is quite narrow band and crisp, which was what I was aiming for. The camera doesn't do it justice.
It also helps to have small diameter reconstructing light source. The 3 Watt LED is quite good in that respect, but it's not very bright.
The depth of the hologram is about 3/4" or so. I have made relatively broadband holograms using this fixture, but it results in more colour dispersion.
I like my holograms to be crisp and clear so that fine details can be seen, even at the cost of brightness.
"Those qualities are especially sought after in color DCG"
That's my aim and I'm working on it :)