The rapid delay scanner consists of a set of optics, including a resonant scanner (CRS 12 kHz, Cambridge Technology), a concave mirror, and a flat mirror, placed in a 4f geometry with a focal length of 50 mm. A rapid optical-beam-angle modulation with the resonant scanner at a rate of 12 kHz was translated to a rapid optical-path-length modulation. The delay length was determined by the scan angle of the resonant scanner and the beam position on the scanning mirror. In our system, an optical scan angle of 10° with the resonant scanner and a beam position of 2.8 mm away from the pivot provided the time delay of 0 to 1.7 ps, which corresponded to an optical path length of 0 to 0.5 mm. The maximum optical-path-length difference between the two arms determined the spectral resolution of the FT-CARS spectrometer, which is 20 cm−1 in our system.

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