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Author

Heejoo Choi

4 papers indexed here

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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
Aug 2026

A scalable rigidized inflatable reflector system for next-generation far-infrared space telescopes

Large-aperture space telescopes are fundamentally constrained by launch vehicle fairing volume, motivating the development of deployable inflatable reflectors that can be packaged compactly and inflated on orbit. While inflatable membrane optics offer dramatic gains in areal density and packaging efficiency, their long...

A. Chandra, Zac Chen, Changgon Kim et al. · 0 citations
Jul 2026

Testing of machine learning wavefront sensing algorithms on the Tiny Observatory for Telescope Optimization (TOTO) testbed

This work considers a Machine Learning model trained originally on simulated data, and then augmented with real focus diversity data from the Tiny Observatory for Telescope Optimization (TOTO) testbed at the University of Arizona, and compares the wavefront sensing performance of the Machine Learning model with known t...

Sanchit Sabhlok, Solvay A. Blomquist, M. Kautz et al. · 1 citation
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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