Optical characterization of a low f-number cryogenic spot scan objective for infrared detectors

J. Gorée; E. Huard de Verneuil; J. Jaeck; O. Gravrand; O. Boulade; J. Primot; S. Derelle

doi:10.1117/12.2627125

29 August 2022 Optical characterization of a low f-number cryogenic spot scan objective for infrared detectors

J. Gorée, E. Huard de Verneuil, J. Jaeck, O. Gravrand, O. Boulade, J. Primot, S. Derelle

Proceedings Volume 12191, X-Ray, Optical, and Infrared Detectors for Astronomy X; 121910O (2022) https://doi.org/10.1117/12.2627125
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

Infrared focal plane arrays are widely used for astronomical observations and are constantly optimized to provide higher-quality images. The knowledge of the pixel spatial response becomes critical to extract ever more data from scientific missions. A specific cryogenic spot scan objective with an f-number of 1.2 has been developed in order to finely characterize 15 μm (or smaller) pixel pitch cooled infrared focal plane arrays in the spectral band between 3-5 μm. It will be operated in the MIRCOS test bench with different narrow-band filters. We present the first optical characterization of this objective obtained with a cryogenic wavefront analyzer – a quadrilateral shearing interferometer. The measured wavefront indicates a peak-to-valley amplitude of 2 μm, which corresponds to an optical quality of about λ/2 at 3.75 μm working wavelength. This value higher than expected might be due to a non-uniform cooling of the objective.

Conference Presentation

Citation Download Citation

J. Gorée, E. Huard de Verneuil, J. Jaeck, O. Gravrand, O. Boulade, J. Primot, and S. Derelle "Optical characterization of a low f-number cryogenic spot scan objective for infrared detectors", Proc. SPIE 12191, X-Ray, Optical, and Infrared Detectors for Astronomy X, 121910O (29 August 2022); https://doi.org/10.1117/12.2627125

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