1,721,107 research outputs found
Compression of Femtosecond Pulses into Dissipative Few-Cycle Optical Solitons in Coherent Nonlinear Resonant Media
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Maxwell-Drude-Bloch dissipative few-cycle optical solitons
No full textWe study the propagation of few-cycle pulses in a two-component medium consisting of nonlinear amplifying
and absorbing two-level centers embedded into a linear and conductive host material. First we present a linear
theory of propagation of short pulses in a purely conductive material and demonstrate the diffusive behavior for the
evolution of the low-frequency components of the magnetic field in the case of relatively strong conductivity. Then,
numerical simulations carried out in the frame of the full nonlinear theory involving the Maxwell-Drude-Bloch
model reveal the stable creation and propagation of few-cycle dissipative solitons under excitation by incident
femtosecond optical pulses of relatively high energies. The broadband losses that are introduced by the medium
conductivity represent the main stabilization mechanism for the dissipative few-cycle solitons
Generation of unipolar pulses from nonunipolar optical pulses in a nonlinear medium
No full textA unipolar electromagnetic pulse is a pulse with nonzero value of the static component of the Fourier spectrum of its real electric field (and not its envelope). We show how to efficiently generate unipolar pulses through propagation of an initially nonunipolar pulse in a nonlinear optical medium. One of the major results is the demonstration that the static component can only be generated in equal portions between the forward- and backward-traveling waves in the presence of nonlinear backscattering in a nonlinear medium
Towards attosecond dissipative solitons and pulses on the basis of self-induced transparency
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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
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