Abstract

Based on our results of the James Webb Space Telescope (JWST) center-of-curvature tests where we were able to measure dynamic amplitudes of Zernike terms to the order of a few picometers, we have applied the same approach to determine if it is possible to measure the accuracy of higher-order Zernike terms as a function of time rather than frequency, i.e., static measurements in place of measuring the amplitude of frequency components. We have applied this approach to data taken for the JWST backplane structure test article (BSTA) in 2006 and find that we can measure effects at the sub-nanometer level, as small as 50 pm for Zernike terms over 30. We conclude that these results show it will be possible to use these techniques to ensure that the optics and support structure for large space telescopes can meet the necessary stability requirements for detecting spectral signatures of life on Earth-like extra-solar planets.

© 2020 Optical Society of America

Measurement of large cryogenic structures using a spatially phase-shifted digital speckle pattern interferometer

Babak Saif, Marcel Bluth, Perry Greenfield, Warren Hack, Bente Hoffmann Eegholm, Peter Blake, Ritva Keski-Kuha, Lee Feinberg, and Jonathan W. Arenberg
Appl. Opt. 47(6) 737-745 (2008)

Nanometer level characterization of the James Webb Space Telescope optomechanical systems using high-speed interferometry

Babak Saif, David Chaney, W. Scott Smith, Perry Greenfield, Warren Hack, Josh Bluth, Austin Van Otten, Marcel Bluth, James Sanders, Ritva Keski-Kuha, Lee Feinberg, Michael North-Morris, and James Millerd
Appl. Opt. 54(13) 4285-4298 (2015)

Calibration of spatially phase-shifted DSPI for measurement of large structures

Babak Saif, Bente Hoffmann Eegholm, Marcel Bluth, Perry Greenfield, Warren Hack, Peter Blake, Ritva Keski-Kuha, and Michael North-Morris
Appl. Opt. 46(23) 5622-5630 (2007)

Measurement of picometer-scale mirror dynamics

Babak Saif, David Chaney, Perry Greenfield, Marcel Bluth, Kyle Van Gorkom, Koby Smith, Josh Bluth, Lee Feinberg, James C. Wyant, Michael North-Morris, and Ritva Keski-Kuha
Appl. Opt. 56(23) 6457-6465 (2017)

In-focus wavefront sensing using non-redundant mask-induced pupil diversity

Alexandra Z. Greenbaum and Anand Sivaramakrishnan
Opt. Express 24(14) 15506-15521 (2016)