20 April 2006 Coherent detection of second harmonic generation in nonlinear optics
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We demonstrate the association of two-photon nonlinear microscopy with balanced homodyne detection for investigating second harmonic radiation properties at nanoscale dimensions. Variation of the relative phase between second-harmonic and fundamental beam is retrieved, as a function of the absolute orientation of the nonlinear emitters. Sensitivity of ≈ 1.6 photon per second, in the spatio-temporal mode of the local oscillator, is obtained. This value is high enough to efficiently detect the second-harmonic emission from a single KTiOPO4 crystal of sub-wavelength size, embedded in a thin polymer film.
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Dominique Chauvat, Loc Le Xuan, François Marquier, Sophie Brasselet, François Treussart, Jean-François Roch, "Coherent detection of second harmonic generation in nonlinear optics", Proc. SPIE 6195, Nanophotonics, 61950Q (20 April 2006); doi: 10.1117/12.667251; https://doi.org/10.1117/12.667251

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