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The imaging speed of current mid-infrared photothermal (MIP) microscope is limited to tens of seconds per frame due to the long pixel dwell time and slow sample scanning process, which is insufficient for capturing dynamics inside living systems. In this work, we developed a video-rate MIP microscope by employing a lock-in free demodulation scheme to resolve single IR pulse induced contrast. We further developed a synchronous pump-probe Galvo scanning for reaching a line rate over 2kHz. With such scheme, the system is capable of resolving chemical dynamics of various biomolecules in living organisms at multiple scales.
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