
DFTFringe, Profile of Wavefront Error
Thanks, Dale.
By
Sorin
· #32095
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DFTFringe, Profile of Wavefront Error
Yes it was a specification specified by Nasa and other optical customers given to Optical suppliers in years past that seemed to also match with known quality smooth mirrors values measured with inter
Yes it was a specification specified by Nasa and other optical customers given to Optical suppliers in years past that seemed to also match with known quality smooth mirrors values measured with inter

By
Dale Eason
· #32094
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DFTFringe, Profile of Wavefront Error
About this, how is determined this slope of 1 arc second as a limit? Is it an optical quality criterion for the slope (something like lambda/4 or so)? Sorin
About this, how is determined this slope of 1 arc second as a limit? Is it an optical quality criterion for the slope (something like lambda/4 or so)? Sorin

By
Sorin
· #32093
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DFTFringe, Profile of Wavefront Error
That is where the profile violates the slope error. The slope error display and value are set using the controls at the top of the profile plot. Dale
That is where the profile violates the slope error. The slope error display and value are set using the controls at the top of the profile plot. Dale

By
Dale Eason
· #32092
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DFTFringe, Profile of Wavefront Error
What does the yellow color on the lines in the Profile of Wavefront Error graph mean? Thanks, Barry
What does the yellow color on the lines in the Profile of Wavefront Error graph mean? Thanks, Barry

By
bdf@...
· #32091
·


More or less accurate Zernike annular polynomials
Well that was easy enough. The package built with no problems for Windows and is now available as a Windows binary in the releases section of my Github repository at zernike_3.7.4.zip. The extended pr
Well that was easy enough. The package built with no problems for Windows and is now available as a Windows binary in the releases section of my Github repository at zernike_3.7.4.zip. The extended pr

By
Michael Peck
· #32090
·


New form of PSIBath interferometer
The following abstract (and accompanying diagram) of a paper suggests that the non right angle form of the bath interferometer using a standard non polarising beamsplitter cube can take advantage of t
The following abstract (and accompanying diagram) of a paper suggests that the non right angle form of the bath interferometer using a standard non polarising beamsplitter cube can take advantage of t

By
Bruce Griffiths
· #32089
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More or less accurate Zernike annular polynomials
Thanks Mike. I think Boost is available for windows at least using the MinGW compiler IIRC.
Thanks Mike. I think Boost is available for windows at least using the MinGW compiler IIRC.

By
Dale Eason
· #32088
·


More or less accurate Zernike annular polynomials
I've uploaded the sources for my Zernike package including my new and improved routines for Zernike Annular polynomials to my github repository at mlpeck/zernike. The annular polynomial code is in 2 f
I've uploaded the sources for my Zernike package including my new and improved routines for Zernike Annular polynomials to my github repository at mlpeck/zernike. The annular polynomial code is in 2 f

By
Michael Peck
· #32087
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Measuring the errors of a geometric phase shifter
Since each waveplate with a retardation of x can achieve retardations of either +x or x by clocking the retarder through 90 degrees, only 3 retarders with retardations of, ideally, 1/12 wave, 1/4 wav
Since each waveplate with a retardation of x can achieve retardations of either +x or x by clocking the retarder through 90 degrees, only 3 retarders with retardations of, ideally, 1/12 wave, 1/4 wav

By
Bruce Griffiths
· #32086
·


Measuring the errors of a geometric phase shifter
If a variable retardance waveplate or the equivalent thereof is used in the collimated source beam its possible in principle to measure and correct the phase shifter errors in every known variant of t
If a variable retardance waveplate or the equivalent thereof is used in the collimated source beam its possible in principle to measure and correct the phase shifter errors in every known variant of t

By
Bruce Griffiths
· #32085
·


Measuring the errors of a geometric phase shifter
The phase shift errors actually depend on the source wavelength, the azimuth of the plane of incidence as well as the angle of incidence. Bruce
The phase shift errors actually depend on the source wavelength, the azimuth of the plane of incidence as well as the angle of incidence. Bruce

By
Bruce Griffiths
· #32084
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Measuring the errors of a geometric phase shifter
Various implementations of geometric/Pancharatnam phase shifters have been proposed and tested without consideration of how the properties of real beamsplitters etc affect the accuracy of the phase sh
Various implementations of geometric/Pancharatnam phase shifters have been proposed and tested without consideration of how the properties of real beamsplitters etc affect the accuracy of the phase sh

By
Bruce Griffiths
· #32083
·


igram wavefront
Oops. I mean lower right corner. I've never figured a mirror so I'm not an expert. Just basically repeating what other's have said.
Oops. I mean lower right corner. I've never figured a mirror so I'm not an expert. Just basically repeating what other's have said.

By
George Roberts (Boston)
· #32082
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igram wavefront
Whatever polishing technique you have been using to parabolize is nearly perfect. I'd just keep doing that for the last 30%. If you try to polish down the outer edge ... it could be bad. It's more com
Whatever polishing technique you have been using to parabolize is nearly perfect. I'd just keep doing that for the last 30%. If you try to polish down the outer edge ... it could be bad. It's more com

By
George Roberts (Boston)
· #32081
·


Bath Wikipedia entry
Sorin Yes, that configuration would work if the RHCPL and LHCPL are oriented so that the quarter waveplate side faces the cube so that they convert the return beams to LHCP and RHCP light. If oriented
Sorin Yes, that configuration would work if the RHCPL and LHCPL are oriented so that the quarter waveplate side faces the cube so that they convert the return beams to LHCP and RHCP light. If oriented

By
Bruce Griffiths
· #32080
·


igram wavefront
Hi George, Thanks for all your help. I’ve been figuring with a Foucault tester, but I believe I’ve been getting erroneous results from not properly collimating the system. So, I’m going to assume that
Hi George, Thanks for all your help. I’ve been figuring with a Foucault tester, but I believe I’ve been getting erroneous results from not properly collimating the system. So, I’m going to assume that

By
...
· #32079
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igram wavefront
Nice! This looks fantastic. Well I ran your igram through dftfringe. It says you have about 74 fringes (xtilt is 37 and double that to get fringes usually). In the first image we can see you are 70% (
Nice! This looks fantastic. Well I ran your igram through dftfringe. It says you have about 74 fringes (xtilt is 37 and double that to get fringes usually). In the first image we can see you are 70% (

By
George Roberts (Boston)
· #32078
·


More or less accurate Zernike annular polynomials
I decided to start a new topic with a more accurate subject header. I've wasted a fair amount of time over a number of years trying to find or deduce a recurrence relation for Zernike annular polynomi
I decided to start a new topic with a more accurate subject header. I've wasted a fair amount of time over a number of years trying to find or deduce a recurrence relation for Zernike annular polynomi

By
Michael Peck
· #32077
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igram wavefront
George, I think this will work. https://drive.google.com/file/d/1ki6QTFIdvdsF_X0wPzLx0NxGiQ_MKHQ/view?usp=sharing Barry
George, I think this will work. https://drive.google.com/file/d/1ki6QTFIdvdsF_X0wPzLx0NxGiQ_MKHQ/view?usp=sharing Barry

By
...
· #32076
·
