Active coronagraphy and coherence differential imaging in unpolarized light with the Swiss Wideband Active Testbed for Coronagraphic High-contrast imaging (SWATCHi) 2.0 (Conference Presentation)

Axel Potier; Audrey Baur; Liurong Lin; Ruben Tandon; Jonas Kühn

doi:10.1117/12.3018281

26 August 2024 Active coronagraphy and coherence differential imaging in unpolarized light with the Swiss Wideband Active Testbed for Coronagraphic High-contrast imaging (SWATCHi) 2.0 (Conference Presentation)

Axel Potier, Audrey Baur, Liurong Lin, Ruben Tandon, Jonas Kühn

Author Affiliations +

Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 131002O (2024) https://doi.org/10.1117/12.3018281
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

The PLACID instrument installed at the new Turkish 4m-DAG telescope in 2024 will be the first active stellar coronagraph, offering a unique facility to perform innovative high-contrast imaging observing strategies. It is composed of a Spatial Light Modulator (SLM) in reflection in lieu of the usual fixed focal plane mask to digitally set up any phase mask in real time. However, such hardware works with a linearly polarized wave causing the loss of 50% throughput. To retrieve full capacity, PLACID will then be upgraded with polarization-independent solutions to be first tested on the Swiss Wideband Active Testbed for Coronagraphic High-contrast imaging (SWATCHi) 2.0. This testbed is also employed to investigate coherent differential imaging techniques that relies on the fast modulation of the speckle intensity whose signal is recorded with a C-RED ONE camera. This work presents the optical design and first results of SWATCHi 2.0.

Conference Presentation

Citation Download Citation

Axel Potier, Audrey Baur, Liurong Lin, Ruben Tandon, and Jonas Kühn "Active coronagraphy and coherence differential imaging in unpolarized light with the Swiss Wideband Active Testbed for Coronagraphic High-contrast imaging (SWATCHi) 2.0 (Conference Presentation)", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 131002O (26 August 2024); https://doi.org/10.1117/12.3018281

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