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- W3103604801 abstract "Optimizing on-sky single-mode fiber (SMF) injection is an essential part of developing precise Doppler spectrometers and new astrophotonics technologies. We installed and tested a prototype SMF-injection system at the Large Binocular Telescope in 2016 April. The fiber injection unit was built as part of the derisking process for a new instrument named iLocater that will use adaptive optics (AO) to feed a high resolution, near-infrared spectrograph. In this paper we report Y-band SMF coupling measurements for bright, M-type stars. We compare theoretical expectations for delivered Strehl ratio and SMF coupling to experimental results, and evaluate fundamental effects that limit injection efficiency. We find the pupil geometry of the telescope itself limits fiber coupling to a maximum efficiency of ρtel ≈ 0.78. Further analysis shows the individual impact of AO correction, tip-tilt residuals, and static (noncommon-path) aberrations contribute coupling coefficients of ρStrehl ≈ 0.33, , and ρncpa ≈ 0.8 respectively. Combined, these effects resulted in an average Y-band SMF efficiency of 0.18 for all observations. Finally, we investigate the impact of fiber coupling on radial velocity precision as a function of stellar apparent magnitude." @default.
- W3103604801 created "2020-11-23" @default.
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- W3103604801 date "2019-11-22" @default.
- W3103604801 modified "2023-10-15" @default.
- W3103604801 title "Characterization of Single-mode Fiber Coupling at the Large Binocular Telescope" @default.
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- W3103604801 doi "https://doi.org/10.1088/1538-3873/ab42cb" @default.
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