Reflective engineered diffusers on the Roman Space Telescope Wide Field Instrument

Benjamin Cromey; Eric H. Frater; Timothy Finch; Genaro Montoya; Raymond Wright; Gregory D. Wirth; Derek Sabatke; Thomas Delker

doi:10.1117/12.2674196

4 October 2023 Reflective engineered diffusers on the Roman Space Telescope Wide Field Instrument

Benjamin Cromey, Eric H. Frater, Timothy Finch, Genaro Montoya, Raymond Wright, Gregory D. Wirth, Derek Sabatke, Thomas Delker

Author Affiliations +

Proceedings Volume 12677, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV; 1267703 (2023) https://doi.org/10.1117/12.2674196
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

NASA’s Roman Space Telescope’s Wide Field Instrument mosaic detector array of 18 H4RG-10 chips requires regular and uncommonly accurate calibrations to meet its science objectives. In addition to the quasi-Lambertian diffuser used for detector flat-fielding, a novel engineered diffuser is incorporated as part of seven cold stop masks on the science bandpass filters. These engineered diffusers are used to illuminate the focal plane concurrently with an exposure from the observatory, enabling signal-dependent nonlinearity corrections. This presentation demonstrates via experimental data how these diffusers can produce a spatially uniform and smooth illumination profile with increased flux compared to a Lambertian diffuser.

Conference Presentation

Citation Download Citation

Benjamin Cromey, Eric H. Frater, Timothy Finch, Genaro Montoya, Raymond Wright, Gregory D. Wirth, Derek Sabatke, and Thomas Delker "Reflective engineered diffusers on the Roman Space Telescope Wide Field Instrument", Proc. SPIE 12677, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV, 1267703 (4 October 2023); https://doi.org/10.1117/12.2674196

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available