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Sketch of the experimental setup. BS: beam splitter; M: mirror; SF57: glass blocks; DM: dichroic mirror; L: lens; SM: scanning mirror; MO: objective; S: sample; F: filter; PMT: photomultiplier tube. Graph: calculated parameter and for the pump (bold) and Stokes (thin) beams. Dashed traces are approximations for (see text).
CARS spectra for as a function of or for different chirped pulse durations corresponding to different spectral resolutions as indicated. (a) Resonant CARS from a polystyrene bead (normalized to its maximum). (b) Nonresonant CARS in 2% agarose gel. Inset in (a): Resonant CARS peak intensity, (left) absolute and (right) relative to the nonresonant CARS intensity vs . Insets in (b): (left) resonant CARS image of a polystyrene bead and (right) line scan vs delay , from which CARS spectra inside and outside the bead are measured (dashed lines).
CARS in polystyrene vs for different as indicated by the vertical lines. (a) for . [(b)–(d)] ratio for as labeled.
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