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I imagine it's all about wavelength absorption of light right?
If you ever want me to run some non-AmDi plates (or better yet a cubit of gelatin) into a spectrophotometer I’d be happy to help out Joe.

Good topic

From the Rallison section of the wiki: "Control of DCG and nonsilver holographic materials": "The direction of the shift can be controlled by the ratio of alcohol and water in the first bath and the amount of shift can be controlled by the time in the same bath. A near ideal tuning b...

I have done some informal dark reation studies. Frankly I haven't seen a huge difference. 5 minutes seems more than enough although I have heard of those who go as long as 24 hours. Most of the dark reaction seems to occur within the first 1-2 minutes. I might go longer if I am making a master and n...

Hi Steven and Dave, I was using 2mm glass resting on a three prong glass holder I was able to get to barrow a SFPI some months ago and I did not see any mode hop although it could be a slow drift. I did see mode hops when I first turned on the system for about 30 ceconds or so. So I shot a plate dur...

Thanks Dave I did clip a thicker piece of glass on the bottom of the plate and the problem went away. I also thought it was glass warp. I have to admit I was using some thinner glass this last few runs since i was running some narrowband experiments. I had success before with it but I think it could...

move.jpg Here is a photo that shows my material test. I stuck on various plastic pieces on a metel base and as you can see there are dark areas. The thinner plastic is problematic. The upper right hand corner is a girls face, note the darkness around her eyes. I hate photos..... Today I shot and mo...

Here I hope is is a photo of the ring
Sorry if the photo is of poor quality

The rings start in the almost center and are about an half inch apart
The Laser is a Melos Griot 457nm 200mw elipitcal beam

Thanks Steven, Can we discuss the results of various types of movement. Although I've been doing this for years I still get stretches were I get odd results. My biggest fear is that my laser is mode hopping but with the equipment that Phil and Sam let me borrowit seem unlikely be the case but it's s...

wow great find Joe

Thanks Steven, that was extremely helpful.