Browsing by Author "Soltani, P."

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    Accurate Testing of Aspheric Surfaces Using the Transport of Intensity Equation by Properly Selecting the Defocusing Distance
    (OSA - The Optical Society, 2016) Soltani, P.; Darudi, A.; Nehmetallah, G.; Moradi, A. R.; Amiri, J.
    In the last decade, the transport of intensity has been increasingly used in microscopy, wavefront sensing, and metrology. In this study, we verify by simulation and experiment the use of the transport of intensity equation (TIE) in the accurate testing of optical aspheric surfaces. Guided by simulation results and assuming that the experimental setup parameters and the conic constants are known, one can estimate an appropriate defocusing distance Äz that leads to an accurate solution of the TIE. In this paper, this method is verified through the construction of a nonnulled experiment for testing the 2D profile of an aspheric surface. The theoretical method and experimental results are compared to validate the results. Finally, to validate the TIE methodology, the phase distribution obtained by TIE is compared with the phase distribution obtained by a Shack-Hartmann sensor.
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    A guide to properly select the defocusing distance for accurate solution of transport of intensity equation while testing aspheric surfaces
    (SPIE, 2016) Soltani, P.; Darudi, A.; Moradi, Ali Reza; Amiri, J.; Nehmetallah, G.
    In this paper, the Transport of Intensity Equation (TIE) for testing of an aspheric surface is verified experimentally. Using simulation, a proper defocus distance Δo that leads to an accurate solution of TIE is estimated whenever the conic constant and configuration of the experiment are known. To verify this procedure a non-nulled experiment for testing an aspheric is used. For verification of the solution, the results are compared with the Shack-Hartmann sensor. The theoretical method and experimental results are compared to validate the results.