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The jig to hold your laser pointer and the plate holder seem to be on carpet. You need a solid surface - a metal plate, for example - that must be secured so it doesn't rock, ie it sits solidly. The plate holder doesn't seem to have anything securing the plate. The object seems to be sitting on the ...

Yes, true. Consider a set of Bragg planes. If the planes are all parallel from two perfectly collimated and perfectly monochromatic, sources (physically impossible), then all the Bragg planes would be at a specific angle and a specific spacing and reconstruction only happens when the reconstruction ...

The HUD market is now reaching upward of $100 million. They've come a long way from when I was making them in 1986!

https://www.insightmedia.info/automotiv ... -investor/

I agree it's not easy to set up your own holographic studio. It's rather specialised and expensive. Basically, you first need an environment which is largely vibration free, such as a basement with a concrete floor or a garage (there are people who'll tell you they've made holograms on a wooden floo...

Joe, I’m not sure if you mentioned what laser you were using as I read through. But I find the PL 530 laser has a hotspot more so than other lasers do. What that means if you need to throw more light away on the edges and use that central version like you had to with, other typical Diode Lasers , i...

It sounds unlikely to be bacteria. Bacteria attacks organic molecules such as gelatin, so it's possible your gelatin got contaminated if left open. But, on heating and stirring the gelatin the bacteria would probably get dispersed, and is unlikely to clump the way you show. It could have attacked th...

You could be right about light loss due to reflections, it depends on the polarisation. Loss of Reflectivity at Brewster's angle only occurs for 'p' (TM) polarisation. Even if you have 'p' polarisation, it would depend on your reference plane. We used a side reference and one problem was to make sur...

It is important to have roughly even illumination of the reference beam, but technically it's not possible (unless you have a beam flattening device). However, within a rough estimate, we can assume an even beam if the edges of the beam are greater than 1/e of the centre ( e = Euler's number). So, a...

A couple of points: It's true that dark reaction improves the image, up to a point. Beyond that point, performance decreases. Remember, what you're after is modulation, the difference between base hardness and the hardness of the planes - or, rather the ratio of hardness of plane to not-plane. Initi...

Joe Farina wrote: ↑Mon Jun 26, 2023 8:00 am By the way, Martin, since you are the best-read person in holography that I know of, do you recall any studies concerning the hardening/dark reaction of gelatin/dichromate at high (~9) pH? I'm drawing a blank. Thanks.

Joe,
It's in Kosar.