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Experimental scheme and energy diagram of two-pulse three-color CARS microscopy setup: BPF, band-pass filter; PCF, photonic crystal fiber; LPF, long-pass filter; and SPF, short-pass filter.
(a) CARS spectra of benzonitrile as a function of the time delay . (b) Comparison of the time-resolved CARS spectrum at and a spontaneous Raman spectrum of benzonitrile. (c) Time profile of CARS signal at is fitted to a single exponential decay with a decay time of , where the uncertainty indicates the standard deviation. The fwhm of the cross correlation (the dashed line) is . The powers of the continuum and narrowband pulses are 4.9 and , respectively.
Broadband CARS images of PS beads in DMSO at and . CARS spectra measured at (a) and (b) at positions A and B, which correspond to PS and DMSO, respectively. [(c)–(e)] Time-resolved CARS images are constructed at the frequencies corresponding to PS and DMSO modes at different time delays. The powers of the continuum and narrowband pulses are 4.6 and , respectively. The acquisition time per pixel is .
(a) Comparison of spontaneous Raman spectra of neat toluene and a bulk PS plate. [(b)–(c)] Time-resolved CARS spectra at the different positions, A (toluene) and B (PS) at different time delays. (d) Time profiles of Raman mode of neat toluene and the PS plate. CARS images are constructed for (e) resonant and (f) nonresonant frequencies at . The line scans correspond to the vertical lines in the images. (g) Time-resolved CARS image of the mode at . A series of CARS images measured at , 2.4, and are fitted to and the dephasing time and the amplitude are constructed as (h) and (i), respectively. For the images, the laser powers are 2.0 and for the continuum and narrowband pulses, respectively. The acquisition time per pixel is .
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