In-situ weak-beam and polarization control of multidimensional laser sidebands for ultrafast optical switching Public Deposited

http://ir.library.oregonstate.edu/concern/articles/rf55z932t

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  • All-optical switching has myriad applications in optoelectronics, optical communications, and quantum information technology. To achieve ultrafast optical switching in a compact yet versatile setup, we demonstrate distinct sets of two-dimensional (2D) broadband up-converted multicolor arrays (BUMAs) in a thin type-I β-barium-borate crystal with two noncollinear near-IR femtosecond pulses at various phase-matching conditions. The unique interaction mechanism is revealed as quadratic spatial solitons (QSSs)-coupled cascaded four-wave mixing (CFWM), corroborated by numerical calculations of the governing phase-matching conditions. Broad and continuous spectral-spatial tunability of the 2D BUMAs are achieved by varying the time delay between the two incident pulses that undergo CFWM interaction, rooted in the chirped nature of the weak white light and the QSSs generation of the intense fundamental beam. The control of 2D BUMAs is accomplished via seeding a weak second-harmonic pulse in situ to suppress the 2D arrays with polarization dependence on the femtosecond timescale that matches the control pulse duration of ~35 fs. A potential application is proposed on femtosecond all-optical switching in an integrated wavelength-time division multiplexing device.
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  • Liu, W., Wang, L., & Fang, C. (2014). In-situ weak-beam and polarization control of multidimensional laser sidebands for ultrafast optical switching. Applied Physics Letters, 104(11), 111114. doi:10.1063/1.4869466
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