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We develop an improved phase calibration method of a reflective spatial lightmodulator (SLM) using interferometry by employing novel phase masks. Wegenerate the optimised phase masks by using Iterative Fourier TransformAlgorithm (IFTA) and demonstrate that they perform with 18$\%$ betterefficiency over global linear corrections in the look-up table (LUT). Inaddition, we also implement global linear corrections in the LUT andcorrespondingly modify the phase encoding of blazed gratings to improve theefficiency of our phase-limited SLM. In the process, we definitively determinethe actual maximum phase throw of our SLM which provides a recipe for users toverify supplier specifications.Besides obtaining array of 1D/2D spots havinghigh uniformity (~90$\%$) using IFTA, our result exemplifies the use ofiterative algorithms for improving efficiency of phase limited SLMs. Finally,our method enables threefold faster phase measurements, and to the best of ourknowledge, is the first endeavour directed towards enabling rapid phasecharacterisation of an SLM using interferometric measurements and can have veryuseful applications in settings which often require faster phase calibrations.

Rapid phase calibration and increased efficiency of a spatial light modulator using novel phase masks and an iterative algorithm