Hi, I have a general question about aligning multiple mirrors in a small mirror array using interferometry. I have 9 small mirrors that combined form a concave mirror with the same focal point. Does D

Coarse phasing can be done using the methods described in https://escholarship.org/content/qt015808kc/qt015808kc_noSplash_563480a9768245124cf16d62df48a4ee.pdf?t=oezrjz Once this is achieved some form

I have a problem with the software. I am trying to determine the astigmatism by rotating four directions according to the standard procedure. Although all four directions show a relatively good curve

When I reached a value of 0.962, I continued working carefully and the next measurement showed much worse. I don't know what could have caused it.

I'm considering re-grinding a 22.4" F/4.2 mirror to F/3.1. I have an old Canon Digital Rebel, 6.3 megapixels effective. Using George's handy dandy igram simulator it looks like testing shouldn't be a

I would like to try to parallelize some algirithms in DFTFringe to speed them up. Especially the batch processing. But first I need to build DFTFringe myself obviously. I am not a programmer or a unix

I am wondering if anyone has experienced that the program freezes after 8-10 igrams of photos? I'm in terrible trouble now that I'm in such a phase while making the big mirror that I need to analyze a

Hello, this is a bit out of topic but I read here https://groups.io/g/Interferometry/topic/80912094 that Dale did know this technique. I think I achieved to do a picture with phase contrast using a so

I took some knife edge test pictures and thought I'd show them.

https://github.com/githubdoe/DFTFringe/releases/download/V6.1/DFTFrnge64Release61.exe * Version 6.1 * Added extensive features to dialogs accessed from simulation menu to create surface features * Add

As I started to shape the mirror from the sphere to the parabola, it became more and more noisy.I can hardly check my work anymore.I'm afraid I can't make the mirror.

Dale, Suppose we have a wavefront with artificial Null correction. Could you please describe the correct procedure to substract from this wft the residual wavefront (The wavefront which has all Zernik

To the Interferometry Group: LADSWin Lens Analysis and Design Software source code has now been uploaded to the GitHub repository at https://github.com/kerrylight/LADSWin This source code is made free

Somewhere in these posts is a record of someone doing final work on a mirror and they said something about spending time rubbing on the high spots to get to 0.999 strehl. Could someone please give me

I have received a number of requests for access to the LADSWin optical design and analysis software. The LADSWin (aka LADS.exe) executable and associated glass type repository (glass.txt) are now avai

Hi, I was wondering if anyone could recommend optical design software useful for ATMs? I know CODEV and Zemax are the industry standards but I was hoping for something less expensive. I really only ne

So a few people have built DFTFringe for linux and now I've gotten it to run on my primary computer in ubuntu:focal (focal is a slightly older version of ubuntu). Screen shot below. So DFTF has been b

Hi, about the lens, I bought a dia=18mm f=13mm lens here : https://fr.aliexpress.com/item/4000168908119.html note it's also 13mm thick. I wasn't aware of the max recommended beam separation of 8mm at

I've joined the Bath group, completing this instrument in just a few hours. I found a very nice 13mm x 15mm DCX lens, a 15mm cube beamsplitter, a 1/10 wave flat mirror, and a laser module. I had bough

Thank you again for guiding my learning on how to use DFTFringe. My test mirror is going to be a challenge. My hope was that Igrams/DFTFringe would give me a general idea of mirror quality. I am inter