Hi, I‘m new to interferometry and just recently built my own Bath interferometer. For analysis, I started using DFTFringe. There are quite some tutorials about how to use DFTFringe but I always like t

Has anyone used one of the analysis packages (DFTFringe or OpenFringe) to measure a Cass secondary by contact with a spherical test plate? Bob

I created another fun javascript tool (two in the last few months! yay!). This one does the same thing as DFTFringe simulate feature except I only do 4 Zernike terms and I do it around 20 times per se

I did some experiments where I took some igrams of my reference mirror with and without polarizing filters (didn't make much difference on final igram but polarizing filters can really help get a clea

I am always looking for non-polarizing cube beamsplitters that would be low cost and sufficiently accurate for use in my SPPDI® product. George had recommended cubes available from Aliexpress. My more

They sometimes have 25mm cubes I believe. Also, he is suppositely going out of business. He was/is trying to sell the business, announced months ago, don't know progress, so might be better not to wai

Provided FYI for anyone who's not on their email list. They claim these are new and manufactured for them. Mike -- Michael Peck https://wildlife-pix.com https://extragalactic.blog https://github.com/m

About a year ago Dale gave me good instructions how to correctly read Wavefront file and arrange the points in correct positions. Reading a file is a triviality, but I have not been able to arrange th

Greetings Not interferometry but it is optical engineering and I did mark it as OT so hopefully this request isn't going to be too vigorously frowned upon. I'm working on designing a liquid transflect

I have found a few bugs in the Current version of DFTFringe. Mostly in the formatting of displays and reports. I have those fixed. I wonder if others have found some I don't know about. Give me your l

I've posted on Cloudy Nights, asking if anyone has used a Scatterplate interferometer to test telescope mirrors. I am hopeful that I can get an old partially made unit to function and capture interfer

In principle a Young's double slit interferometer can be used to measure source wavelength to within 0.1% or better. Calibration of the fringe scale at a single known wavelength (using either an HeNe

I  believe I mentioned this before but will reiterate since the subject of "old" 35mm SLR lenses came up. I use a Canon FD lens, a Moog adapter and my ZWO planetary camera for imaging fringes.  I have

Best regards to all my friends from the Interferometry group for a happy hollydays. Vladimir -- Vladimir

Hey Everyone, After a long period of inactivity, I recently had to make a mirror again and I decided to used DFTFringe (V5.1) during the figuring process, which worked very well by the way. The mirror

Have designed and ordered parts for an on axis Bath interferometer incorporating the DMI components that I have (PBS, quarter wave plates, halfwave pates etc). The source will be a fiber coupled laser

Interferograms are disturbed by vibrations and thermal air turbulence. Vibrations are reduced by isolation of the interferometer setup from the vibration source, and the turbulence effect is reduced b

I spent much of the last week creating this fun tool. It's particularly helpful if you are desigining a Bath Interferometer and want to know if you can use for example a 25mm cube instead of a 15mm cu

An on axis Bath interferometer with an accessible real incident test beam focus can have an optical flat placed at the test beam focus to allow measurement of any residual rotationally symmetric error

On Wed, Feb 12, 2020 at 05:15 AM, vladimir galogaza wrote: > > Results for some coefficients are attached. I would think piston or defocus would be the most reliable ones to look at. Dale