Colloquium at The Institute of Optics

Wavefront Sensing and Control for Aligning the JWST

April 25, 2022


Dr. James Fienup, Professor of Optics

Professor for Center for Visual Science, Professor of Electrical and Computer Engineering, Affiliated Faculty, Goergen Institute for Data Science

Distinguished Scientist in the Laboratory for Laser Energetics

Institute of Optics, University of Rochester


ABSTRACT:     The James Webb Space Telescope (JWST), a $10B Christmas gift to the astronomical community, was launched on the morning of December 25, 2021. Since then, the 18 segments making up its 6.5-meter primary mirror were unfolded and aligned to form a coherently phased surface that is yielding
diffraction-limited images. The final fine-phasing step was performed with phase retrieval algorithms
that were developed over the decades and made more robust at the Institute of Optics. This talk will describe algorithms invented earlier for determining the aberrations of the Hubble Space Telescope,
which were transitioned to the phasing of JWST, some of research performed here, and finally the
multiple other steps in aligning the mirror segments.


TITLE: Wavefront Sensing and Control for Aligning the JWST

DATE:  April 25, 2022

TIME: 3:30 PM - 4:30 PM (EDT)