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- W2077341505 abstract "In single-beam coherent anti-Stokes Raman spectroscopy (CARS), a complete four-wave-mixing scheme is accomplished within a single pulse from an ultrashort femtosecond oscillator. Spectral information is achieved by coherent control of the non-linear signal generation using phase modulation of the excitation with a pulse shaper. This single-beam approach can be even extended to heterodyne detections schemes wherein a strong local oscillator (LO) field, also generated by pulse shaping from the same excitation laser, interferes with the CARS signal. Here, we explore the potential of this promising technique. A careful optimisation of the experimental scheme is presented together with an analysis of the different relations between LO field and CARS signal intensity, discovering an optimal LO field at a fraction of about 10−4 compared to the overall CARS excitation energy. With the optimised set-up, an absolute number of molecules as low as 5 × 106 corresponding to concentrations in the attomole regime in the focal volume can be detected. Using such an optimal parameterisation, heterodyne single-beam CARS based on a broadband laser source is introduced to microscopic applications, combining chemical selectivity and a high spatial resolution of the non-linear CARS process with the sensitivity of the heterodyne approach. Copyright © 2009 John Wiley & Sons, Ltd." @default.
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- W2077341505 date "2009-04-08" @default.
- W2077341505 modified "2023-09-27" @default.
- W2077341505 title "Heterodyne single-beam CARS microscopy" @default.
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- W2077341505 doi "https://doi.org/10.1002/jrs.2260" @default.
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