Search found 794 matches
- Fri Sep 29, 2023 11:55 am
- Forum: General Holography
- Topic: Moving the object to reduce speckle?
- Replies: 9
- Views: 6513
Re: Moving the object to reduce speckle?
BobH and Din, thank you for your replies. Bob, I'm not currently using a mirror except for the dichroics which combine the 3 lasers in the other room. Once the beams go through the hole in the wall, I have a small platform for the spatial filter, which is not attached to the table. The table is a sh...
- Fri Sep 29, 2023 6:23 am
- Forum: General Holography
- Topic: Moving the object to reduce speckle?
- Replies: 9
- Views: 6513
Moving the object to reduce speckle?
This idea was suggested to me by another holographer. Say we have a Denisyuk arrangement with an object/plate/plate holder assembly which is essentially locked together (no movement relative to each other). Now we place this on a small isolation table (which is on air). Nothing else is on the table....
- Thu Sep 28, 2023 1:51 pm
- Forum: holoforum administration
- Topic: Status of email service
- Replies: 3
- Views: 16249
- Sun Sep 10, 2023 9:37 am
- Forum: DCG
- Topic: Angular Bandwidth in DCG
- Replies: 10
- Views: 10867
Re: Angular Bandwidth in DCG
That's fascinating. Thanks for the explanation.
- Sat Sep 09, 2023 2:45 pm
- Forum: DCG
- Topic: Angular Bandwidth in DCG
- Replies: 10
- Views: 10867
Angular Bandwidth in DCG
I was reading a paper which suggested that "angular bandwidth" (which I assume is the number of viewing angles a hologram can be seen from, i.e., narrow angular bandwidth = restricted viewing angles) can be related to spectral bandwidth. The paper suggested that narrow spectral bandwidth i...
- Thu Aug 24, 2023 7:47 am
- Forum: holoforum administration
- Topic: Thank you John Fisher
- Replies: 1
- Views: 4647
Thank you John Fisher
Thank you for maintaining the Holography Forum. It's an invaluable resource!
- Sat Aug 12, 2023 10:06 am
- Forum: General Holography
- Topic: collimated reference beams
- Replies: 5
- Views: 6496
Re: collimated reference beams
Thanks Dave, I'm using a Sapphire 488nm (200mW) right now. The PL 530 is becoming a popular holography laser, it's amazing how much green light is now available to holographers at low cost. By the way, I saw your 275mW green Sapphire head on eBay. I've always wondered to what extent Sapphire control...
Re: Bacteria?
Thanks Din. That's an interesting thought about the hair dryer, I used a new one with a ceramic heating element. Maybe the ceramic was shedding dust. If the problem persists, I'll get out the microscope.
Bacteria?
This morning's DCG has some blank (empty) spots which I haven't seen before. P1010050.JPG On the right side of the image, there is a multitude of tiny <1mm spots which group together at the far right, then spread out more as they go to the left. They're also visible at the bottom. When coating the p...
- Sun Jul 30, 2023 10:40 am
- Forum: General Holography
- Topic: collimated reference beams
- Replies: 5
- Views: 6496
Re: collimated reference beams
Din, thank you for fielding my questions lately, it's been a big help. In my setup, I didn't use a side reference like you did. My plate was mostly "flat" on the table, that is, one end of the plate was raised/tilted 33 degrees off the table (90 - 57 = 33) and the laser beam (coming in fro...