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Design requirements of a spectropolarimeter for solar extreme-ultraviolet observations and characterization of a K-mirror based on Brewster's angle

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dc.contributor.author Khan, Raveena
dc.contributor.author Radhika, Dharmadhikari
dc.contributor.author Mathur, Harsh
dc.contributor.author Nagaraju, K
dc.contributor.author Jain, Sinchana R
dc.contributor.author Phanindra, D. V. S
dc.contributor.author Sagayanathan, K
dc.date.accessioned 2024-12-17T05:58:09Z
dc.date.available 2024-12-17T05:58:09Z
dc.date.issued 2024-12-01
dc.identifier.citation Applied Optics, Vol. 63, No. 34, pp. 8738-8747 en_US
dc.identifier.issn 1559-128X
dc.identifier.uri http://hdl.handle.net/2248/8610
dc.description Restricted Access en_US
dc.description.abstract Measuring the linear polarization signal in extreme-ultraviolet (EUV) spectral lines, produced by the Hanle effect, offers a promising technique for studying magnetic fields in the solar corona. The required signal-to-noise ratio for detecting the Hanle polarization signals is on the order of 101 (off-limb) to 106 (disk center). Measuring such low signals in the photon starved observations demands highly efficient instruments. In this paper, we present the design of an instrument, SpectroPOLarimeter for Extreme-ultraviolet Observations (SPOLEO), which utilizes reflective components with suitable mirror coatings and thicknesses to minimize the throughput losses. We analyze the system performance within the spectral range from 740 to 800 Å. The K-mirror-based polarimeter model provides a polarizing power of 20%–40% in this wavelength range. Based on the system throughput and polarizing power, we discuss various possibilities for achieving the required signal-to-noise ratio, along with their limitations. Due to lack of facilities for fabrication and testing in the EUV, we have calibrated a prototype of the reflection-based polarimeter setup in the laboratory at the visible wavelength of 700 nm. en_US
dc.language.iso en en_US
dc.publisher Optica Publishing Group en_US
dc.relation.uri https://doi.org/10.1364/AO.537460
dc.rights © 2024 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved
dc.title Design requirements of a spectropolarimeter for solar extreme-ultraviolet observations and characterization of a K-mirror based on Brewster's angle en_US
dc.type Article en_US


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