Spatially resolved phase objects using Mach–Zehnder interferometry
Résumé
Phase characterization with a good spatial resolution is crucial for focused beams in nonlinear media. The phaseshifting interferometry technique, using the least-squares error criterion for several interferograms, is implemented using a reflective spatial light modulator (SLM). The method provides a convenient calibration for any phase-shift steps. The reliability of the proposed method is checked by direct comparison with results obtained by the Fourier transform method as well as using a previously characterized circular phase object.
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