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Many applications of microendoscopy, including brain imaging, requires minimally invasive devices to minimize damage during insertion in the tissue. Here we present a minimally-invasive endoscope based on a multimode fiber that combines photoacoustic and fluorescence sensing. By learning the transmission matrix during a prior calibration step, a focused spot can be produced and raster-scanned over a sample at the distal tip of the fiber by use of a spatial light modulator. We demonstrate that our setup provides both photoacoustic and fluorescence microscopic images of test samples in vitro (fluorescent beads and red blood cells) through the same fiber.
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Sylvain Mezil, Irène Wang, Philippe Moreau, Théodore Remark, Antonio M. Caravaca-Aguirre, Emmanuel Bossy, "Photoacoustic and fluorescent microscopy through a multimode fiber by use of optical wavefront shaping (Conference Presentation)," Proc. SPIE 11240, Photons Plus Ultrasound: Imaging and Sensing 2020, 1124027 (6 March 2020); https://doi.org/10.1117/12.2544967