Design of the Tx attenuating photoreceiver for the LISA stray light assessment instrumentation

Marco Nardello; Michel Lintz

doi:10.1117/12.2691355

12 July 2023 Design of the Tx attenuating photoreceiver for the LISA stray light assessment instrumentation

Marco Nardello, Michel Lintz

Author Affiliations +

Proceedings Volume 12777, International Conference on Space Optics — ICSO 2022; 127776T (2023) https://doi.org/10.1117/12.2691355
Event: International Conference on Space Optics — ICSO 2022, 2022, Dubrovnik, Croatia

Abstract

This paper describes the design of a unit called Tx Attenuating Photoreceiver (TAP), dedicated to the measuring and dumping of a 2 W beam with 300 mm diameter. This unit is a part of an instrumentation called Stray Light Optical Ground Segment Equipment for the test of the Interferometric Measurement System (IMS) of the LISA mission. The geometry of the instrument is studied to reduce the size of the beam, focus it on a photodiode, dump its power and minimize scattering and reflections back to the IMS. An off-axis parabolic absorber with anti-reflection coating will stop the beam, reflecting only 0.2 % towards a pinhole and a photodiode. Most of the materials and components are commercially available, but the design and size of the parabola are specific.

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Marco Nardello and Michel Lintz "Design of the Tx attenuating photoreceiver for the LISA stray light assessment instrumentation", Proc. SPIE 12777, International Conference on Space Optics — ICSO 2022, 127776T (12 July 2023); https://doi.org/10.1117/12.2691355

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KEYWORDS

Stray light

Nanoimprint lithography

Reflection

Telescopes

Design and modelling

Mirror surfaces

Parabolic mirrors

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