29 April 1999 Twyman Green interferometer with CGH for testing of cylindrical surfaces
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Proceedings Volume 3729, Selected Papers from International Conference on Optics and Optoelectronics '98; (1999) https://doi.org/10.1117/12.346815
Event: Selected Papers from the International Conference on Optics and Optoelectronics, 1998, Dehradun, India
Abstract
Modifications of the basic Twyman Green Interferometer for the testing of the a cylindrical surface are described in this paper. A CGH cylindrical lens of f equals 45.0 mm is put in the test arm of the interferometer to serve as a null lens. Polarizing components are used to provide for adjustments of the intensities of the two beams. The resulting interferograms have a strong bright patch in the middle which does not allow the unwrapping of the phase. A modification of the CGH cylindrical element makes this patch to disappear making possible the application of phase shifting technique for measurement of these surfaces.
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D. K. Sharma, D. K. Sharma, Johannes Schwider, Johannes Schwider, } "Twyman Green interferometer with CGH for testing of cylindrical surfaces", Proc. SPIE 3729, Selected Papers from International Conference on Optics and Optoelectronics '98, (29 April 1999); doi: 10.1117/12.346815; https://doi.org/10.1117/12.346815
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