1,721,115 research outputs found
Spectrum to distance mapping via nonlinear airy pulses
No full textWe show that the spectra of Airy pulses reshape into one or two self-shifting peaks for normal or anomalous dispersion during nonlinear evolution, respectively. Those peaks effectively map the longitudinal coordinate into the frequency domain. © OSA 2013
Collapse arrest in instantaneous kerr media via parametric interactions
No full textWe demonstrate a four wave mixing interaction based on four wave mixing that can arrest the collapse and stabilize solitary propagation in a pure Kerr material by controlling the wavelength of the interacting beams
High-intensity self-accelerating Airy pulses and controllable spectral shifting in nonlinear Kerr media
No full textWe show that high-intensity Airy pulses propagating in Kerr-type nonlinear media can preserve their self-accelerating features under appropriate conditions. By engineering the input pulses, controllable spectral shifting and reshaping are achieved. © 2012 OSA
Enhancing upconversion with space–time entanglement: from twin photons to twin-beams
No full textWe investigate the use of entangled photons generated by parametric downconversion to improve the efficiency of second harmonic generation (SHG). Using a fully three-dimensional model for the nonlinear interactions, we obtain quantitative predictions of the efficiency of quantum-enhanced SHG and identify the critical parameters to optimize the process. By a careful control of the spatial and temporal degrees of freedom, we demonstrate a robust quantum advantage, extending to illumination fluxes well above the limits traditionally considered in the literature. Our analysis offers valuable insights into the ongoing debate on quantum-enhanced two-photon processes and helps establish their usefulness in applications
Notch nonlinear frequency shift in AlGaAs bragg grating waveguides
No full textWe present an investigation on the nonlinear dynamics of intense pulses in an AlGaAs Bragg waveguide and we report the experimental observation of an intensity dependent blue-shift of the Bragg notch spectral line. © OSA/ANIC/IPR/Sensors/SL/SOF/SPPCom/2011
Enhanced detection of broadband terahertz fields via the filamentation of chirped optical pulses
No full textWe show that by employing positively chirped optical probe pulses above a critical power it is possible to enhance the detection bandwidth and signal obtained by Air Biased Coherent Detection scheme for broadband terahertz fields. © 2012 OSA
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Collapse arrest in instantaneous kerr media via parametric interactions
No full textWe demonstrate a four wave mixing interaction based on four wave mixing that can arrest the collapse and stabilize solitary propagation in a pure Kerr material by controlling the wavelength of the interacting beams
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