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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...

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....

Din wrote: ↑Thu Sep 28, 2023 8:38 am Of course, this is in the technical field, not green figurines.

ha ha ha

That's fascinating. Thanks for the explanation.

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...

Thank you for maintaining the Holography Forum. It's an invaluable resource!

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...

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.

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...

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...