Fig. 1: Concept and setup of the high-speed scanless mid-infrared hyperspectral chemical imaging.
From: High-speed scanless entire bandwidth mid-infrared chemical imaging
a Conceptual illustration of high-speed scanless mid-infrared (MIR) hyperspectral chemical imaging. b Mid-infrared hyperspectral chemical imaging setup. M1, M2, M3, and M4: mirrors (high reflection for ωF), BS: beam splitter with 70% transmittance and 30% reflectance. BBO: β-BaB2O4 (type-I, cut angle 29˚, thickness 100 µm). CM1: dielectric concave mirror (high reflection for ωF and ωSHG, radius of curvature: 1.5 m), CM2: aluminium-coated concave mirror (radius of curvature: 0.5 m) with a hole of 7 mm diameter, CM3, CM4, and CM5: gold-coated concave mirrors (radius of curvature, CM3: 0.5 m, CM4: 0.4 m and CM5: 0.3 m), CR: corner reflector with two mirrors (high reflection for ωF), LPF: long pass filter (Semrock FF01-776/LP-25, cut-on wavelength: 783 nm), SPF: short pass filter (Semrock FF01-770/SP-25, cut-on wavelength: 752 nm), Lens: achromatic lens (focal length 200 mm), M5 and M6: aluminium-coated mirrors, BPF: tunerable bandpass filter set (Semrock TBP01-704/13-25x36 and TBP01-790/12-25x36), HSI: hyperspectral imaging unit (EBA JAPAN, SIS-H-0.45nm, number of effective pixels: 640 × 480), II-HSC: a high-speed gated image intensifier unit (Hamamatsu, 10880-13F) and a high-speed camera (Phantom, VEO 410L).
