Abstract

Model calibration is performed for an adaptive freeform surface interferometer (AFI). In view of the non-unique null configuration in AFI, the multi-null constraint (MNC) calibration method is proposed to address error coupling in the null configuration modeling. The final figure error of the tested surface can be extracted together with the coupling parameters. The performance of the MNC method is evaluated in simulations and experiments. The higher accuracy is proved after the MNC calibration. This calibration is preparation for the subsequent system instrumentation.

© 2020 Optical Society of America

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