Wide-field mid-infrared hyperspectral imaging beyond video rate

Jianan Fang, Kun Huang (), Ruiyang Qin, Yan Liang, E Wu, Ming Yan and Heping Zeng ()
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Jianan Fang: East China Normal University
Kun Huang: East China Normal University
Ruiyang Qin: East China Normal University
Yan Liang: University of Shanghai for Science and Technology
E Wu: East China Normal University
Ming Yan: East China Normal University
Heping Zeng: East China Normal University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Mid-infrared hyperspectral imaging has become an indispensable tool to spatially resolve chemical information in a wide variety of samples. However, acquiring three-dimensional data cubes is typically time-consuming due to the limited speed of raster scanning or wavelength tuning, which impedes real-time visualization with high spatial definition across broad spectral bands. Here, we devise and implement a high-speed, wide-field mid-infrared hyperspectral imaging system relying on broadband parametric upconversion of high-brightness supercontinuum illumination at the Fourier plane. The upconverted replica is spectrally decomposed by a rapid acousto-optic tunable filter, which records high-definition monochromatic images at a frame rate of 10 kHz based on a megapixel silicon camera. Consequently, the hyperspectral imager allows us to acquire 100 spectral bands over 2600-4085 cm−1 in 10 ms, corresponding to a refreshing rate of 100 Hz. Moreover, the angular dependence of phase matching in the image upconversion is leveraged to realize snapshot operation with spatial multiplexing for multiple spectral channels, which may further boost the spectral imaging rate. The high acquisition rate, wide-field operation, and broadband spectral coverage could open new possibilities for high-throughput characterization of transient processes in material and life sciences.

Date: 2024
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DOI: 10.1038/s41467-024-46274-z

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