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Brillouin spectrometers use etalons to analyze Brillouin spectra. Line-scan Brillouin microscopes improve the image acquisition time ~100-fold than what was previously achievable by coupling line illumination with etalon spectrometers to multiplex the spectral measurement a row of pixels at a time. Multiplexing represents a way to improve Brillouin imaging speeds, but etalon-based spectrometers cannot multiplex a full image. Here, we investigate the potential of a new spectrometer based on atomic hyperfine transitions, enabling simultaneous analysis of a full field of view. We show that the spectrometer can fully transmit an image without distortions, thus proving the potential for 2D multiplexing.
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Romanus J. Hutchins, Giulia Zanini, Giuliano Scarcelli, "Brillouin spectroscopy using atomic hyperfine transitions," Proc. SPIE PC11962, Optical Elastography and Tissue Biomechanics VIV, PC1196203 (2 March 2022); https://doi.org/10.1117/12.2610449