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11 August 2016 Comparative study of infrared wavefront sensing solutions for adaptive optics
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The development of new low-noise infrared detectors, such as RAPID (CEA LETI/Sofradir) or SAPHIRA (Selex), has given the possibility to consider infrared wavefront sensing at low ux. We propose here a comparative study of near infrared (J and H bands) wavefront sensing concepts for mid and high orders estimation on a 8m- class telescope, relying on three existing wavefront sensors: the Shack-Hartmann sensor, the pyramid sensor and the quadri-wave lateral shearing interferometer. We consider several conceptual designs using the RAPID camera, making a trade-off between background flux, optical thickness and compatibility with a compact cryostat integration. We then study their sensitivity to noise in order to compare them in different practical scenarios. The pyramid provides the best performance, with a gain up to ∼ 0.5 magnitude, and has an advantageous setup.
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C. Plantet, T. Fusco, N. Guerineau, S. Derelle, and C. Robert "Comparative study of infrared wavefront sensing solutions for adaptive optics", Proc. SPIE 9909, Adaptive Optics Systems V, 990966 (11 August 2016);


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