14 May 2018 Phase-matched optical wave mixing in the XUV region by two-colour high-order harmonic generation
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Abstract
We report here evidence of phase-matched optical wave mixing in the extreme ultraviolet (XUV) region. This process has been studied with a collinear two-colour high-order harmonic generation scheme. An 800 nm, 30 fs driving field is used to produce a small bandwidth comb of odd harmonic orders (wavelength around 30 nm) in a long cell filled with argon gas. Mixing frequencies in this spectral range are produced by applying a second weak control-field of 1,400 nm, 40 fs. Low order (third- and fifth-order) nonlinear optical wave mixing is observed to be a phase-matched process. The dependence of the intensity of the harmonic orders and the mixing frequencies on different control-field intensities, gas pressure, and interaction length is analysed to verify the phase matching process.
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Khoa Anh Tran, Khuong Ba Dinh, Peter Hannaford, Lap Van Dao, "Phase-matched optical wave mixing in the XUV region by two-colour high-order harmonic generation", Proc. SPIE 10684, Nonlinear Optics and its Applications 2018, 106840K (14 May 2018); doi: 10.1117/12.2292659; https://doi.org/10.1117/12.2292659
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