The James Webb Space Telescope mission: optical telescope element design, development, and performance

…, KA Havey, WL Hayden, R Hellekson… - Publications of the …, 2023 - iopscience.iop.org
The James Webb Space Telescope (JWST) is a large, infrared space telescope that has
recently started its science program which will enable breakthroughs in astrophysics and …

When is it worth assembling observatories in space?

…, J Grunsfeld, K Havey, R Hellekson… - Bulletin of the …, 2019 - ui.adsabs.harvard.edu
To investigate the viability and benefits of in-Space Assembly, Dr. Paul Hertz, Director of
NASA’s Astrophysics Division, chartered a study, asking “When is it worth assembling space …

Achieved technology maturation of key component-level technologies for ultra-stable optical systems

…, L Pueyo, M East, R Hellekson… - Space Telescopes …, 2022 - spiedigitallibrary.org
The recently released Astro2020 Decadal Survey recommends a large IR/O/UV space
telescope that can observe potentially habitable exoplanets. Achieving this goal requires a …

Status of the JWST optical telescope element

…, R Hellekson, K Patton, R Keski-Kuha… - … I: Optical, Infrared …, 2006 - spiedigitallibrary.org
Significant progress has been made in the development of the Optical Telescope Element (OTE),
one of three elements of the James Webb Space Telescope (JWST) Observatory. To …

Technology maturation of key component-level technologies for ultra-stable optical systems

…, L Pueyo, M East, R Hellekson… - … , and Test of Space …, 2021 - spiedigitallibrary.org
To achieve the ambitious science goal of performing direct imaging of earth-like exoplanets
with a high contrast coronagraph, future space-based astronomical telescopes will require …

Optical system design for high speed bar code scanning

R Hellekson, B Reddersen… - Design of Optical …, 1987 - spiedigitallibrary.org
Spectra-Physics recently introduced the Model 750 SL scanner for use in the European
point-of-sale market, to meet the European requirement for a scanner of less than 13 cm height. …

Progress towards hardware demonstrations of critical component-level technologies for ultra-stable optical systems

…, T Lawton, J Arenberg, R Hellekson… - Space Telescopes …, 2020 - spiedigitallibrary.org
To achieve the ambitious goal of directly imaging exo-Earths with a coronagraph, future
space-based astronomical telescopes will require wavefront stability several orders of …

Bright light therapy of subsyndromal seasonal affective disorder in the workplace: morning vs. afternoon exposure

…, D Kizer, MA Bolte, C Hellekson - Acta Psychiatrica …, 2001 - Wiley Online Library
… (r=0.32, P=0.09). The percentage improvement in SIGH-SAD did not correlate with the MEQ
score (r=−0.11, P=NS) or the degree of degree of seasonality as measured by the GSS (r=−…

Modeling And Simulation Of Bar Code Scanners Using Computer Aided Design Software

R Hellekson, S Campbell - Simulation and Modeling of Optical …, 1988 - spiedigitallibrary.org
Many optical systems have demanding requirements to package the system in a small 3
dimensional space. The use of computer graphic tools can be a tremendous aid to the designer …

[PDF][PDF] Laser Direct Writing and Precision Pattern Alignment

R Hellekson, C Addington, C Metge… - NIP & Digital …, 2006 - library.imaging.org
There are many ways of using lasers to direct write or create an image of functional
electronic material. However, one of the challenges of making electronic devices on flexible …