  Spectral imaging in the mid-infrared (MIR) range provides simultaneous
morphological and chemical information of a wide variety of samples. However,
current MIR technologies struggle to produce high-definition images over a
broad spectral range at acquisition rates that are compatible with real-time
processes. We present a novel spectral imaging technique based on
non-degenerate two-photon absorption of temporally chirped optical MIR pulses.
This new approach avoids complex image processing or reconstruction and enables
high-speed acquisition of spectral data cubes [xyw] at high pixel density in
under a second.
