Lark E. Bradsby, Andrew A. Voitiv, Mark E. Siemens
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Two-step phase-shifting interferometry for phase-resolved imaging from a spatial light modulator
We demonstrate two-step phase-shifting interferometry (holography) of complex
laser modes generated by a spatial light modulator (SLM), in which the
amplitude and phase of the signal are determined directly from measurements of
phase-shifted interferograms. The reference and signal beams are generated and
phase-controlled with a single composite hologram on the SLM and propagated
collinearly. This requires no additional optics and leads to measurements that
are more accurate and less prone to noise, which we demonstrate with
collinearly-referenced measurements of various Laguerre-Gaussian modes and
structured images.
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