26 July 2016 Testing the pyramid truth wavefront sensor for NFIRAOS in the lab
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Abstract
For today and future adaptive optics observations, sodium laser guide stars (LGSs) are crucial; however, the LGS elongation problem due to the sodium layer has to be compensated, in particular for extremely large telescopes. In this paper, we describe the concept of truth wavefront sensing as a solution and present its design using a pyramid wavefront sensor (PWFS) to improve NFIRAOS (Narrow Field InfraRed Adaptive Optics System), the first light adaptive optics system for Thirty Meter Telescope. We simulate and test the truth wavefront sensor function under a controlled environment using the HeNOS (Herzberg NFIRAOS Optical Simulator) bench, a scaled-down NFIRAOS bench at NRC-Herzberg. We also touch on alternative pyramid component options because despite recent high demands for PWFSs, we suffer from the lack of pyramid supplies due to engineering difficulties.
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Etsuko Mieda, Matthias Rosensteiner, Maaike van Kooten, Jean-Pierre Veran, Olivier Lardiere, Glen Herriot, "Testing the pyramid truth wavefront sensor for NFIRAOS in the lab", Proc. SPIE 9909, Adaptive Optics Systems V, 99091J (26 July 2016); doi: 10.1117/12.2231838; https://doi.org/10.1117/12.2231838
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