Polarization modeling and predictions for DKIST part 1: telescope and example instrument configurations

Harrington, David M.; Sueoka, Stacey R.

doi:10.1117/12.2233176

Cited by 4 publications

(3 citation statements)

References 49 publications

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“…For example, the Daniel K. Inoyue Solar Telescope supports a suite of polarimetric instrumentation that is sensitive to the influence of optical polarization. To support this regime of optical physics, the scalar assumption is not sufficient, so the polarization state is propagated along geometric ray paths using polarization ray tracing 4 , 5 to determine the influence of polarization aberrations on the optical beam 6 . Modern space telescopes also require integrated models to accurately predict the instrument behavior.…”

Section: Introductionmentioning

confidence: 99%

“…To support this regime of optical physics, the scalar assumption is not sufficient, so the polarization state is propagated along geometric ray paths using polarization ray tracing 4,5 to determine the influence of polarization aberrations on the optical beam. 6 Modern space telescopes also require integrated models to accurately predict the instrument behavior. For example, the optical models of the James Webb Space Telescope incorporate the influence of dynamic thermal, structural, and optical effects simultaneously to produce an accurate library of the observatory's jitter.…”

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confidence: 99%

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Hybrid propagation physics for the design and modeling of astronomical observatories: a coronagraphic example

Ashcraft,

Douglas,

Kim

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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.For diffraction-limited optical systems, an accurate physical optics model is necessary to properly evaluate instrument performance. Astronomical observatories outfitted with coronagraphs for direct exoplanet imaging require physical optics models to simulate the effects of misalignment and diffraction. Accurate knowledge of the observatory’s point-spread function (PSF) is integral for the design of high-contrast imaging instruments and simulation of astrophysical observations. The state of the art is to model the misalignment, ray aberration, and diffraction across multiple software packages, which complicates the design process. Gaussian beamlet decomposition (GBD) is a ray-based method of diffraction calculation that has been widely implemented in commercial optical design software. By performing the coherent calculation with data from the ray model of the observatory, the ray aberration errors can be fed directly into the physical optics model of the coronagraph, enabling a more integrated model of the observatory. We develop a formal algorithm for the transfer-matrix method of GBD and evaluate it against analytical results and a traditional physical optics model to assess the suitability of GBD for high-contrast imaging simulations. Our GBD simulations of the observatory PSF, when compared to the analytical Airy function, have a sum-normalized RMS difference of ≈10 − 6. These fields are then propagated through a Fraunhofer model of an exoplanet imaging coronagraph where the mean residual numerical contrast is 4 × 10 − 11, with a maximum near the inner working angle at 5 × 10 − 9. These results show considerable promise for the future development of GBD as a viable propagation technique in high-contrast imaging. We developed this algorithm in an open-source software package and outlined a path for its continued development to increase the accuracy and flexibility of diffraction simulations using GBD.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Hybrid propagation physics for the design and modeling of astronomical observatories: a coronagraphic example

Ashcraft,

Douglas,

Kim

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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show abstract

“…For Thirty Meter Telescope (TMT), a combination of analytical and numerical methods is used (Anche et al, 2015). However, for Daniel K. Inouye Solar Telescope (DKIST), Zemax -a commercial software -is used, along with the team's in-house tools (Harrington & Sueoka, 2016).…”

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confidence: 99%

PyAstroPol: A Python package for the instrumental polarization analysis of the astronomical optics.

Pruthvi¹

2020

JOSS

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The instrumental polarization analysis is one of the key aspects of the optical system analysis of the astronomical telescopes and instruments. The majority of the optical surfaces in the astronomical instruments induce a change in the state of polarization of the incoming light, which could lead to inaccurate measurements of the state of polarization or polarimetry. Hence, polarimetric instruments inevitably require the information about the polarization properties of the optical system or the instrumental polarization. This can be determined through experiments, analysis or a combination of both. As the telescopes become larger and instruments become more complex, the instrumental polarization analysis has become all the more crucial (e.g., Anche et al., 2015; Harrington & Sueoka, 2016).

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Atomic physics and solar polarimetry

Judge

2017

Can. J. Phys.

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Observational solar physics is entering a new era with the advent of new 1.5 m class telescopes with adaptive optics, as well as the Daniel K. Inouye 4 m telescope which will become operational in 2019. Major outstanding problems in solar physics all relate to the solar magnetic field. Spectropolarimetry offers the best, and sometimes only, method for accurate measurements of the magnetic field. In this paper we highlight how certain atomic transitions can help us provide both calibration data, as well as diagnostic information on solar magnetic fields, in the presence of residual image distortions through the atmosphere close to, but not at the diffraction limits of large and polarizing telescopes. Particularly useful are spectral lines of neutrals and singly charged ions of iron and other complex atoms. As a proof-of-concept, we explore atomic transitions that might be used to study magnetic fields without the need for an explicit calibration sequence, offering practical solutions to the difficult challenges of calibrating the next generation of solar spectropolarimetric telescopes. Suggestions for additional work on atomic theory and measurements, particularly at infrared wavelengths, are given. There is some promise for continued symbiotic advances between solar physics and atomic physics.

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Polarization modeling and predictions for DKIST part 1: telescope and example instrument configurations

Cited by 4 publications

References 49 publications

Hybrid propagation physics for the design and modeling of astronomical observatories: a coronagraphic example

Hybrid propagation physics for the design and modeling of astronomical observatories: a coronagraphic example

PyAstroPol: A Python package for the instrumental polarization analysis of the astronomical optics.

Atomic physics and solar polarimetry

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