Focus diverse phase retrieval test results on broadband continuous wavefront sensing in space telescope applications

Continuous wavefront sensing benefits space observatories in on-orbit optical performance maintenance. Phase retrieval is an attractive technique to collect phase of a wavefront without additional metrology systems nor complicated calibration. In this study, we tested the performance of the phase retrieval algorithm on broadband under various cases. We investigated the effect of bandwidth and signal-to-noise ratio to the accuracy of the algorithm. We also investigated the effect of the amount of defocus in dynamic range and the accuracy. Finally, we simulated the continuous wavefront sensing and correction with a range of statistically generated representative telescope disturbance time series to test for edge cases. data that is generated based on the operation circumstances.