13 September 2012 Fine optical alignment correction of astronomical spectrographs via in-situ full-field moment-based wavefront sensing
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Abstract
The image moment-based wavefront sensing (IWFS) utilizes moments of focus-modulated focal plane images to determine modal wavefront aberrations. This permits fast, easy, and accurate measurement of wavefront error (WFE) on any available finite-sized isolated targets across the entire focal plane (FP) of an imaging system, thereby allowing not only in-situ full-field image quality assessment, but also deterministic fine alignment correction of the imaging system. We present an experimental demonstration where fine alignment correction of a fast camera system in a fiber-fed astronomical spectrograph, called VIRUS, is accomplished by using IWFS.
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Hanshin Lee, Gary J. Hill, Sarah E. Tuttle, Brian L. Vattiat, "Fine optical alignment correction of astronomical spectrographs via in-situ full-field moment-based wavefront sensing", Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84500V (13 September 2012); doi: 10.1117/12.926741; https://doi.org/10.1117/12.926741
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