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Complex Beam Mapping and Fourier Optics Analysis of a Wide-Field Microwave Kinetic Inductance Detector Camera


For astronomical instruments, accurate knowledge of the optical pointing and coupling is essential to characterize the alignment and performance of (sub-)systems prior to integration and deployment. Ideally, this requires the phase response of the optical system, which for direct (phase insensitive) detectors was not previously accessible. Here, we show development of the phase-sensitive complex beam pattern technique using a dual optical source heterodyne technique for a large-field-of-view microwave kinetic inductance detector camera at 350 GHz. We show here how you can analyze the measured data with Fourier optics, which allows integration into a telescope model to calculate the on-sky beam pattern and telescope aperture efficiency prior to deployment at a telescope.

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The authors thank Ronald Hesper for his contributions to the hardware system. K. Davis is currently supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-1801983. This work was in part supported by ERC starting Grant ERC-2009-StG Grant 240602 TFPA. The contribution of J.J.A. Baselmans is also supported by the ERC consolidator Grant COG 648135 MOSAIC.

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Correspondence to S. J. C. Yates.

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Yates, S.J.C., Davis, K.K., Jellema, W. et al. Complex Beam Mapping and Fourier Optics Analysis of a Wide-Field Microwave Kinetic Inductance Detector Camera. J Low Temp Phys (2020).

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  • Complex field mapping
  • Kinetic inductance detector
  • Optical characterization
  • Near- to far-field transformation
  • Gaussian beam analysis