Wavefront sensing and control in space-based coronagraph instruments using Zernike’s phase-contrast method
نویسندگان
چکیده
منابع مشابه
Hybrid phase retrieval using moment-based wavefront sensing and Gerchberg-Saxton iterative transform method
The iterative phase retrieval method has the intrinsic weakness in computational speed. However, its ability to capture fine spatial phase structure is clearly the benefit much needed in characterizing image quality of an instrument in an end-to-end fashion. The empirical wisdom of any iterative process is that the convergence becomes a lot faster when the initial guess is close to the phase so...
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The wavefront sensor is the most critical component of an adaptive optics (AO) system. Most astronomical systems use one of a small number of alternatives, notably the Shack-Hartmann or the curvature sensor; these are sensitive to the first and second derivative of the wavefront phase, respectively. In this paper, we explore a novel adaptation of the phase-contrast techmque developed for micros...
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The success of phase retrieval on the Hubble Space Telescope (HST) [1][2][3][4][5] led us to consider phase retrieval as a possible method of wavefront sensing for future large space telescopes. Phase retrieval can be used in an active optical control loop as the fine figure sensor by utilizing the science cameras with little or no additional optical hardware but with an increase in either on-b...
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ژورنال
عنوان ژورنال: Journal of Astronomical Telescopes, Instruments, and Systems
سال: 2020
ISSN: 2329-4124
DOI: 10.1117/1.jatis.6.4.045005