We present a deep-learning-based phase-retrieval framework that uses Bessel-beam illumination to extend the recoverable aberration range in wavefront sensing. By exploiting the large effective numerical aperture and extended depth of focus of Bessel beams, the proposed method increases the range of measurable aberratio...
Zhao-Wei Chen, Ryan Luu, R. Parks et al.· Optical Manufacturing and Te...· 0 citations
Stochastic Parallel Gradient Descent (SPGD) is widely used for model-free optical alignment because it produces an implicit descent signal when no explicit gradient is available. We use SPGD in the third of four sequential stages (blind-scan, model-based fit, SPGD, focus-diverse phase retrieval) of the commissioning pi...
Ryan Luu, Solvay A. Blomquist, Heejoo Choi et al.· Optical Manufacturing and Te...· 0 citations
Optical alignment of an astronomical three-mirror anastigmat (TMA) telescope is a challenging endeavor where misalignments may degrade image quality beyond what is possible to correct using simple wavefront measurement techniques. Traditionally, the primary and secondary mirrors of large-scale telescopes are aligned wi...
Solvay A. Blomquist, Heejoo Choi, Hyukmo Kang et al.· Journal of Astronomical Tele...· 0 citations
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