The stability of FT-CARS spectrometer was evaluated by measuring spectrum-to-spectrum fluctuations of the peak position and intensity of the ring-stretching mode of cyclohexane at 801 cm−1. Continuous 2404 FT-CARS spectra of cyclohexane placed on a glass slide were obtained for the evaluation (fig. S7A). The acquired peak positions and intensities were evaluated by fitting a Gaussian function to them (fig. S7, B and C). The SDs of the spectrum-to-spectrum fluctuations of the peak position and intensity were estimated to be smaller than 0.6 cm−1 and 6%, respectively (fig. S7, B and C).

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