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We introduce an improved method for standoff chemical detection of films and residues on solid targets which scatter or reflect the incident light using single-beam Coherent anti-Stokes Raman Scattering.
We demonstrate Fourier synthesis of RN-like multiple coherent anti-Stokes Raman-scattering signals in a KTaO3 single crystal at room temperature. Isolated pulses with 13-fs duration and 520-690-nm wavelength range are generated without any active chirp compensator.
Detailed angle resolved spectroscopy reveals that intense multiple Raman-Nath like CARS signals (350-720 nm) are generated in diamond under pumping of two-phonon Raman peak by two-color femtosecond pulses.
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