Search found 798 matches
- Wed May 01, 2024 7:50 am
- Forum: General Holography
- Topic: noise due to a large (extended) object
- Replies: 5
- Views: 157
Re: noise due to a large (extended) object
Thank you for the clear and superbly written explanation!
- Tue Apr 30, 2024 6:56 am
- Forum: General Holography
- Topic: noise due to a large (extended) object
- Replies: 5
- Views: 157
Re: noise due to a large (extended) object
Thanks for the very helpful clarifications. The hologram does not "record" a grainy-looking hologram. Subjective speckle is an illusion of the eye, objective speckle is the speckle pattern on the object that the reflected laser light reflects onto; if a laser beam is reflected off some obj...
- Tue Apr 30, 2024 6:25 am
- Forum: holoforum administration
- Topic: problem with attachments
- Replies: 0
- Views: 93
problem with attachments
Hi John,
I've recently been getting error messages when trying to add attachments, the message says: "Sorry, the board attachment quota has been reached."
Just wanted to check if there's an easy fix for this.
Thanks for all your efforts in maintaining the forum.
Joe
I've recently been getting error messages when trying to add attachments, the message says: "Sorry, the board attachment quota has been reached."
Just wanted to check if there's an easy fix for this.
Thanks for all your efforts in maintaining the forum.
Joe
- Sun Apr 28, 2024 4:42 pm
- Forum: General Holography
- Topic: noise due to a large (extended) object
- Replies: 5
- Views: 157
noise due to a large (extended) object
Since the forum has been slow lately, I would like to pose the following question (which I've been wondering about). Say we make two holograms that measure 10cm X 10cm. These would be single-beam Denisyuk DCG reflection holograms (with a wide dynamic range associated with DCG, if that makes a differ...
- Sat Mar 30, 2024 6:00 am
- Forum: Beginning Holography
- Topic: Hello! Good books for interested peeps?
- Replies: 3
- Views: 976
Re: Hello! Good books for interested peeps?
Welcome to the forum. Practical Holography by Saxby, G., I saw someone mention 4th edition is best, but is it really worth an extra $140 over a 3rd edition In my opinion, probably not. My favorite is the 2nd edition. As for getting started in holography, I would recommend a green (532nm) laser of at...
- Tue Mar 19, 2024 1:30 pm
- Forum: General Holography
- Topic: beam ratios: silver vs. polymer vs. DCG
- Replies: 5
- Views: 1269
Re: beam ratios: silver vs. polymer vs. DCG
Wow, thank you Din and Joy! Joy's comments seem to confirm my impressions about Bayfol HX200 photopolymer. When I did the first two, they were just simple Denisyuk with no extra object light. I didn't measure the reference/object ratio, but the reference must have been much, much stronger. White obj...
- Mon Mar 18, 2024 10:25 am
- Forum: General Holography
- Topic: beam ratios: silver vs. polymer vs. DCG
- Replies: 5
- Views: 1269
Re: beam ratios: silver vs. polymer vs. DCG
The Bayfol material is impressive, and it works reasonably well with a very high reference to object ratio. But, compared to (non-dye) DCG, it doesn't seem capable of very high brightness, without a certain quantity of object light. In my limited experience, that is. I did a hologram yesterday with ...
- Mon Mar 18, 2024 9:37 am
- Forum: General Holography
- Topic: beam ratios: silver vs. polymer vs. DCG
- Replies: 5
- Views: 1269
beam ratios: silver vs. polymer vs. DCG
Having done my first few photopolymer holograms (Bayfol HX200), it seems that polymer is more dependent on beam ratio equality (ideally ~1:1 for a reflection hologram) compared to DCG. It reminds me of silver halide, but perhaps not as extreme. Maybe this is due to the dyes present in polymer and si...
- Fri Feb 16, 2024 12:43 pm
- Forum: For Sale / Want to Buy / Trade
- Topic: Looking for photopolymer films
- Replies: 11
- Views: 21825
Re: Looking for photopolymer films
Like Bob said previously, the films have a stickiness comparable to a post-it note. First remove the PE protective film by sticking a piece of adhesive tape to the corner, and peel it away. Then laminate it to your glass (a rubber roller is good for this). Bubbles and dust can be a problem at this s...
- Tue Jan 30, 2024 12:15 pm
- Forum: For Sale / Want to Buy / Trade
- Topic: Looking for photopolymer films
- Replies: 11
- Views: 21825
Re: Looking for photopolymer films
Regarding availability, I ordered from Geola in Lithuania recently with no problems. They are professional and fast.
https://www.geola.com/product/photopolymer/
The total cost including shipping to the US was 149 Euros for 36 sheets of HX200 (2 packs of 18 each) of the 10cm X 10cm size.
https://www.geola.com/product/photopolymer/
The total cost including shipping to the US was 149 Euros for 36 sheets of HX200 (2 packs of 18 each) of the 10cm X 10cm size.