The CASTLE telescope: on the use of curved freeform sensors for astronomical applications and beyond (Conference Presentation)

Emmanuel Hugot; Jiawei Liu; Manal Chebbo; Samuel Boissier; Eloise Bernaud; Simona Lombardo; Eduard Muslimov; Pierre-Alain Duc; Christian Kintziger; Mathieu Barthelemy; Frédéric Chavane; Marc Ferrari; Jérémy Brisbois; Sophie Caranhac; Stephan Kraft; Indraneil Biswas

doi:10.1117/12.3021406

26 August 2024 The CASTLE telescope: on the use of curved freeform sensors for astronomical applications and beyond (Conference Presentation)

Emmanuel Hugot, Jiawei Liu, Manal Chebbo, Samuel Boissier, Eloise Bernaud, Simona Lombardo, Eduard Muslimov, Pierre-Alain Duc, Christian Kintziger, Mathieu Barthelemy, Frédéric Chavane, Marc Ferrari, Jérémy Brisbois, Sophie Caranhac, Stephan Kraft, Indraneil Biswas

Author Affiliations +

Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 131000H (2024) https://doi.org/10.1117/12.3021406
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

The field curvature has been a long-term problem optical designers had to deal with, to propose flat corrected field instruments. Combinations of highly aspherical optics, TMA configurations, achromatic doublets or field flatteners are often used to reach good optical quality across the image. Allowing designers to play with the parameters of the field’s shape is offering them a brand-new game field. The possibility of curving the CMOS sensors to fit curved/aspherical/freeform shapes of focal surfaces has been studied for the last 20 years and led today to different applications and prototypes. We present in this article 1/ the parameter studies we performed over a large set of optical designs showing the gain offered by this approach, 2/ the CMOS sensors curving process and performance over a large set of prototypes, 3/ Optical systems that have been produced with this technology and 4/ the roadmap related to the development of curved-sensors based instrumentation for astronomy with the CASTLE telescope project and physical sciences through the Auroral UV Imager program led by ESA.

Conference Presentation

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Emmanuel Hugot, Jiawei Liu, Manal Chebbo, Samuel Boissier, Eloise Bernaud, Simona Lombardo, Eduard Muslimov, Pierre-Alain Duc, Christian Kintziger, Mathieu Barthelemy, Frédéric Chavane, Marc Ferrari, Jérémy Brisbois, Sophie Caranhac, Stephan Kraft, and Indraneil Biswas "The CASTLE telescope: on the use of curved freeform sensors for astronomical applications and beyond (Conference Presentation)", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 131000H (26 August 2024); https://doi.org/10.1117/12.3021406

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KEYWORDS

Astronomical telescopes

Telescopes

Astronomy

Sensors

CMOS sensors

Image quality

Prototyping

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