Wavefront calibration testing of the James Webb Space Telescope primary mirror center of curvature optical assembly

Olczak, Gene; Wells, Conrad; Fischer, David G.; Connolly, Mark

doi:10.1117/12.927003

Cited by 8 publications

(2 citation statements)

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“…A photogrammetry system 26 was used to verify key alignments, fiber-fed sources were used at the Cassegrain focus looking both up and down, and phase retrieval algorithms used in the wavefront sensing and control were employed in "pass and a half" and "half-pass" end-toend optical tests. 27…”

Section: Otis Test Configuration Refinementsmentioning

confidence: 99%

“…The optical test equipment used a center of curvature interferometer to prove the segmented primary mirror could be properly phased, along with a series of tests using three auto-collimating optical flat mirrors with sources at the Cassegrain focus the OTE to prove the overall prescription of the optical train was correct. A photogrammetry system 26 was used to verify key alignments, fiber-fed sources were used at the Cassegrain focus looking both up and down, and phase retrieval algorithms used in the wavefront sensing and control were employed in “pass and a half” and “half-pass” end-to-end optical tests 27 …”

Section: Jwst Systems Engineering Historymentioning

confidence: 99%

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Lessons learned from systems engineering on the James Webb Space Telescope

Menzel,

Parrish,

Feinberg

et al. 2024

J. Astron. Telesc. Instrum. Syst.

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The James Webb Space Telescope is NASA's flagship mission and successor to the highly successful Hubble Space Telescope. It is an infrared observatory featuring a cryogenic 6.6 m aperture, deployable optical telescope element with a payload of four science instruments assembled into an integrated science instrument module that provide imagery and spectroscopy in the near infrared band between 0.6 and 5 μm and in the mid-infrared band between 5 and 28 μm. JWST was successfully launched on December 25, 2021, aboard an Ariane 5 launch vehicle. All 50 major deployments were successfully completed by January 8, 2022. The observatory performed all mid-course correction maneuvers and achieved its operational mission orbit around the Sun-Earth second Lagrange Point. All commissioning and calibration activities have been completed and JWST has begun its science mission. Its present performance meets or out-performs all requirements. Launching over 20 years after its mission concept review, the JWST Observatory is a first and only of its kind of facility. This program faced many unique challenges that were not only technical in nature but also organizational and managerial. We describe the challenges faced by the JWST systems engineering team, the way the team addressed them, and make recommendations for focus areas of future flagship missions, which will likely face similar challenges. It will not explicitly address the cost challenges of the mission. We first describe the mission and its over-arching challenges. We then describe the tailoring of systems engineering processes and methods used to address these challenges and effectiveness. The events, tasks, issues, and their resolutions and the resulting specific lessons learned from the project are discussed with the over-arching recommendations for future flagship missions that derive from these lessons.

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Section: Otis Test Configuration Refinementsmentioning

confidence: 99%

Section: Jwst Systems Engineering Historymentioning

confidence: 99%

Lessons learned from systems engineering on the James Webb Space Telescope

Menzel,

Parrish,

Feinberg

et al. 2024

J. Astron. Telesc. Instrum. Syst.

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Laser-Induced Local Oxidation of Thin Metal Films: Physical Fundamentals and Applications

Veiko

Полещук

2014

Fundamentals of Laser-Assisted Micro- And Nanotechnologies

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Local laser oxidation of thin metal films allows recording of an optical image on thin films with the highest resolution and high productivity at the same time, and without distortions specific to laser ablation. A technique for writing of diffractive optical elements was developed on the basis of this process. Laser-matter interaction physics and laser technology underlying this method are described in this chapter. IntroductionIn our opinion, laser oxidation of thin metal films is a successful example of the discovery of a new effect, its explanation and application. Furthermore, although all these developments took place at the beginning of the laser era, the interest in these has not decayed up to now, not to mention a new technique (short-pulse laser writing), at this point, a new physics was also required due to the coming of the "nano" era.Let us briefly describe these developments in the introduction because the authors were their direct participants. The effect that formed the basis of the research field under discussion was first observed in our experiments aimed to determine the evaporation thresholds q ev of thin chromium films exposed in the optical projection

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