To acquire distortion-free CARS spectra, a time-grid correction of the interferograms is required. Since our rapid delay scanner generates nonlinearly increasing time delays, the sampled interferograms were systematically distorted. To correct the distortion, we corrected the time grid by using the constant optical-path-length difference. To produce a calibration signal for the correction, we collinearly introduced a continuous-wave laser beam at a wavelength of 1064 nm (QLD1061, QD Laser) in the interferometer to generate calibration interferograms. The calibration interferograms were detected with a photodetector and sampled with the digitizer. The zero crossings of the AC component of the interferograms provide a grid on the constant optical-path-length difference, with which the time grid of the measured CARS interferograms was calibrated. Although the calibration was made by post–signal processing in our system, it can be done in real time by external clocking of the digitizer as described in (13).

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