The authors present a highly flexible and adaptable nulling solution utilizing a SLM (Spatial Light Modulator), which can manipulate the test beam wavefront in order to match the required nulling phase for a large range of freeform optics. Compared to other adaptable approaches such as a DM (Deformable Mirror)-based solution [L. Huang, H. Choi, W. Zhao, L. R. Graves, and D. W. Kim, "Adaptive interferometric null testing for unknown freeform optics metrology," Opt. Lett. 41(23), 5539-5542 (2016)], the reported adaptive interferometric test using a high-definition phase-only SLM measures a freeform surface with a larger dynamic range, covering up to a sag departure of 150 μm from its base-sphere. In summary, this letter nicely presents a smart and versatile interferometric nulling technology with a programmable phase component for single-shot interferometric measurement of freeform optics.
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