Search found 280 matches

by lobaz
Sun Jan 17, 2021 10:05 am
Forum: AgX
Topic: A pdf of all known bleaches
Replies: 10
Views: 12671

Re: A pdf of all known bleaches

What is the purpose of using these different bleaches? Do they change the outcome of the hologram? This is a very interesting and thought-provoking question. A quick answer would be: yes, some bleaches affect the outcome significantly. First of all, there is a piece of history behind. At first, hol...
by lobaz
Sat Jan 09, 2021 2:44 pm
Forum: Beginning Holography
Topic: First attempt
Replies: 10
Views: 8529

Re: First attempt

So what kind of laser do you recommend to enhance my holograms on a budget of $ 50 to $ 100 (for DCG)? Look in the For Sale / Trade section of the forum. The user soda offers a nice reliable 100 mW green laser, holomaker may have some as well. Send them a private message or post a request to that s...
by lobaz
Wed Jan 06, 2021 6:19 am
Forum: Beginning Holography
Topic: First attempt
Replies: 10
Views: 8529

Re: First attempt

Hi Serge, sorry, I don't know any Mexican holograher. 1. My first suspect would be the laser. Are you sure it is stable enough for holography? Did you build a Michelson interferometer and observed the fringes over a long period of time? Or even better, can you analyse the laser spectrum? 2. The seco...
by lobaz
Tue Jan 05, 2021 12:52 pm
Forum: Beginning Holography
Topic: First attempt
Replies: 10
Views: 8529

Re: First attempt

Hi Serge,
I think it is quite impressive for a begginer. Starting with DCG is not easy, as there are too many variables what can get wrong. Where are you located? Did you try to find any holographer nearby?

Petr
by lobaz
Thu Dec 31, 2020 3:28 pm
Forum: Beginning Holography
Topic: Fog hologram transmition
Replies: 1
Views: 3401

Re: Fog hologram transmition

Hi Antonio,
you should provide more details, a photo of the setup and the hologram would be also helpful. Anyway, if you use silver halide plates, my first guess would be overexposure.

Petr
by lobaz
Wed Nov 11, 2020 12:33 pm
Forum: Beginning Holography
Topic: Holographic Optical Element (HOE) of simple reflection mirror
Replies: 13
Views: 10548

Re: Holographic Optical Element (HOE) of simple reflection mirror

Dinesh, did you take into account index of refraction of the emulsion in your back-of-the-envelope calculation? I guess the Bragg planes would not be at the angle 30 deg.
by lobaz
Wed Nov 11, 2020 12:30 pm
Forum: Beginning Holography
Topic: Holographic Optical Element (HOE) of simple reflection mirror
Replies: 13
Views: 10548

Re: Holographic Optical Element (HOE) of simple reflection mirror

The strips you see are most likely from interference between reflection on the first surface of the mirror (glass) and on the second surface (silver or Al). You need a first surface mirror, i.e., the there in no cover glass on the silver surface.
by lobaz
Wed Oct 21, 2020 12:19 pm
Forum: Gallery
Topic: First non-terrible color hologram
Replies: 5
Views: 9476

Re: First non-terrible color hologram

Thanks for the document. The presented hologram looks like the one Yves Gentet makes. The photo of the lab refers to "Vladimir" - it may be Vladimir Kuznetsov who works with Ultimate plates a lot. The document also mentions "Kris" - it may be Kris Meerlo, who also works with Ulti...
by lobaz
Mon Oct 19, 2020 4:20 pm
Forum: Optics
Topic: Understanding the principle
Replies: 14
Views: 10252

Re: Understanding the principle

If you mean the display with the terrain from the film Avatar (https://james-camerons-avatar.fandom.com/wiki/Operations_Center), this is hardly possible with classical holography. If fact, illusions floating in the air above an table are still possible just in sci-fi. I am not aware of any pysical p...
by lobaz
Sat Oct 17, 2020 6:03 am
Forum: Optics
Topic: Understanding the principle
Replies: 14
Views: 10252

Re: Understanding the principle

Ytre wrote: Fri Oct 16, 2020 3:03 pm I dont understand what did you mean by hyperbola? Is it projection on film? Could you explain it in detail?
https://en.wikipedia.org/wiki/Hyperbola