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Detection of exoplanets using high-resolution spectroscopy is limited by a balance between spatial and spectral sampling and resolution. We propose to use a highly multiplexed Bragg grating (HMBG) to optically correlate relevant parts of a spectrum. The HMBG sidesteps the trade-off between spatial and spectral resolution, increasing the number of available spatial pixels by 10^3-10^4. The HMBG is implemented using an acousto-optical filter. This filter gives the freedom to dynamically combine any desired set of spectral lines. We will show the simulated performance of a system with an HMBG in a realistic environment.
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Fedde Fagginger Auer, Sebastiaan Haffert, Christoph Keller, Frans Snik, Emiel Por, "Exoplanet detection and characterization with highly multiplexed Bragg gratings," Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 114474J (13 December 2020); https://doi.org/10.1117/12.2562472