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

Yates, S. J. C.; Davis, Kristina; Jellema, Willem; Baselmans, J. J. A.; Baryshev, A.

doi:10.1007/s10909-020-02352-2

Cited by 3 publications

(2 citation statements)

References 20 publications

(25 reference statements)

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“…In addition, misalignment of the submm beam can be extracted from the PA patterns. We therefore employed a quasi-heterodyne measurement technique (Davis et al 2019;Yates et al 2020) that allowed us to obtain PA beam patterns of direct detectors, such as MKIDs. We specifically employed an extension to the measurement technique, called the harmonic phase and amplitude (HPA) measurement.…”

Section: Harmonic Phase-amplitude Measurementsmentioning

confidence: 99%

Optimisation-based alignment of wide-band integrated superconducting spectrometers for submillimeter astronomy

Moerman,

Karatsu,

Yates

et al. 2024

A&A

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Integrated superconducting spectrometers (ISSs) for wide-band submillimeter (submm) astronomy use quasi-optical systems for coupling radiation from the telescope to the instrument. Misalignment in these systems is detrimental to the system performance. The common method of using an optical laser to align the quasi-optical components requires an accurate alignment of the laser to the submm beam from the instrument, which is not always guaranteed to a sufficient accuracy. We develop an alignment strategy for wide-band ISSs that directly uses the submm beam of the wide-band ISS. The strategy should be applicable in both telescope and laboratory environments. Moreover, the strategy should deliver similar quality of the alignment across the spectral range of the wide-band ISS. We measured the misalignment in a quasi-optical system operating at submm wavelengths using a novel phase and amplitude measurement scheme that is capable of simultaneously measuring the complex beam patterns of a direct-detecting ISS across a harmonic range of frequencies. The direct detection nature of the microwave kinetic inductance detectors in our device-under-test, DESHIMA 2.0, necessitates the use of this measurement scheme. Using geometrical optics, the measured misalignment, a mechanical hexapod, and an optimisation algorithm, we followed a numerical approach to optimise the positioning of corrective optics with respect to a given cost function. Laboratory measurements of the complex beam patterns were taken across a harmonic range between 205 and 391 GHz and were simulated through a model of the ASTE telescope in order to assess the performance of the optimisation at the ASTE telescope. Laboratory measurements show that the optimised optical setup corrects for tilts and offsets of the submm beam. Moreover, we find that the simulated telescope aperture efficiency is increased across the frequency range of the ISS after the optimisation.

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Section: Harmonic Phase-amplitude Measurementsmentioning

confidence: 99%

Optimisation-based alignment of wide-band integrated superconducting spectrometers for submillimeter astronomy

Moerman,

Karatsu,

Yates

et al. 2024

A&A

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“…To achieve this goal a phase and amplitude measuring system was implemented. Such systems with MKID arrays have been previously demonstrated by [12], [13], and [14], a heterodyne technique, using the interference beat between two frequency offset solid-state multiplier sources with a common phase reference. In this work, we present a novel implementation of a phase and amplitude beam measuring system based in the use of terahertz photonic sources and phase shifting interferometry.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Widefield THz Optics Using Phase Shifting Interferometry

Reyes,

Mayorga,

Grutzeck

et al. 2023

IEEE Trans. THz Sci. Technol.

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Simons Observatory: characterizing the Large Aperture Telescope Receiver with radio holography

Chesmore¹,

Harrington²,

Sierra³

et al. 2022

Appl. Opt.

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We present near-field radio holography measurements of the Simons Observatory Large Aperture Telescope Receiver optics. These measurements demonstrate that radio holography of complex millimeter-wave optical systems comprising cryogenic lenses, filters, and feed horns can provide detailed characterization of wave propagation before deployment. We used the measured amplitude and phase, at 4 K, of the receiver near-field beam pattern to predict two key performance parameters: 1) the amount of scattered light that will spill past the telescope to 300 K and 2) the beam pattern expected from the receiver when fielded on the telescope. These cryogenic measurements informed the removal of a filter, which led to improved optical efficiency and reduced sidelobes at the exit of the receiver. Holography measurements of this system suggest that the spilled power past the telescope mirrors will be less than 1%, and the main beam with its near sidelobes are consistent with the nominal telescope design. This is the first time such parameters have been confirmed in the lab prior to deployment of a new receiver. This approach is broadly applicable to millimeter and submillimeter instruments.

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

Cited by 3 publications

References 20 publications

Optimisation-based alignment of wide-band integrated superconducting spectrometers for submillimeter astronomy

Optimisation-based alignment of wide-band integrated superconducting spectrometers for submillimeter astronomy

Characterization of Widefield THz Optics Using Phase Shifting Interferometry

Simons Observatory: characterizing the Large Aperture Telescope Receiver with radio holography

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