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Oct 2026

Bessel-beam-based hybrid physics-informed phase retrieval from single-shot measurements

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. · 0 citations
Oct 2026

Adaptive local-minimum escape strategies for SPGD-based space telescope alignment

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. · 0 citations
Open access Aug 2026

On-orbit coarse alignment of three mirror anastigmat telescopes utilizing blind scanning and stochastic processes

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. · 0 citations

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