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Optics and Photonics News

Formation of optical sub-cycle pulses and full Maxwell-Bloch solitary waves by coherent propagation effects

Vladimir P. Kalosha, Joachım Herrmann

Published Dec 1, 1999• 0 citations
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Generation of optical sub-cycle pulses and full Maxwell-Bloch solitary waves by coherent propagation effects

Vladimir P. Kalosha, Joachım Herrmann

Summary form only given. Recent advances in ultrafast laser technology have made possible the generation of extremely short and intense pulses with only two optical periods of less than 5 fs in duration in the visible region. Efforts for generation of still shorter pulses is motivated by the possibility to study light matter interactions under unique conditions as the pulse duration approaches the duration of a single optical cycle. We study the propagation of a 5-fs pulse through a layer of a dense medium of two-level systems. As a result we demonstrate the formation of single-cycle and half-cycle pulses in the sub-fs region and novel types of spectral changes during propagation as large blue and red shifts in the transmitted and reflected pulses, respectively, explained by intra-pulse frequency-difference mixing. Solitary pulse propagation phenomena beyond the limits of slowly-varying envelope (SVEA) and rotating-wave approximation (RWA) are illustrated as the formation of full Maxwell-Bloch half-cycle solitons and two-soliton pulses.

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Formation of Optical Subcycle Pulses and Full Maxwell-Bloch Solitary Waves by Coherent Propagation Effects

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We demonstrated that optical subcycle pulses can be generated in dense media of two-level systems due to pulse splitting and reshaping of pulses of a few optical-cycles time duration. Novel features in the spectral signatures of the pulses are predicted, a large blueshift in the transmitted and a large redshift in the reflected pulse, which are explained by intrapulse four-wave mixing. Solitary propagation phenomena in the full Maxwell-Bloch equations beyond the limits of slowly varying envelope and rotating-wave approximations are observed, e.g., the formation of solitary half-cycle pulses and two-soliton pulses.

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Near dipole-dipole effects on the propagation of few-cycle pulse in a dense two-level medium

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The propagation behaviors, which include the carrier-envelope phase, the area evolution and the solitary pulse number of few-cycle pulses in a dense two-level medium, are investigated based on full-wave Maxwell-Bloch equations by taking Lorentz local field correction (LFC) into account. Several novel features are found: the difference of the carrier-envelope phase between the cases with and without LFC can go up to pi at some location; although the area of ultrashort solitary pulses is lager than 2pi, the area of the effective Rabi frequency, which equals to that the Rabi frequency pluses the product of the strength of the near dipole-dipole (NDD) interaction and the polarization, is consistent with the standard area theorem and keeps 2pi; the large area pulse penetrating into the medium produces several solitary pulses as usual, but the number of solitary pulses changes at certain condition.

Optics Express•Jan 1, 2005•29 citations
Summary form only given. Recent advances in ultrafast laser technology have made possible the generation of extremely short and intense pulses with only two optical periods of less than 5 fs in duration in the visible region. Efforts for generation of still shorter pulses is motivated by the possibility to study light matter interactions under unique conditions as the pulse duration approaches the duration of a single optical cycle. We study the propagation of a 5-fs pulse through a layer of a dense medium of two-level systems. As a result we demonstrate the formation of single-cycle and half-cycle pulses in the sub-fs region and novel types of spectral changes during propagation as large blue and red shifts in the transmitted and reflected pulses, respectively, explained by intra-pulse frequency-difference mixing. Solitary pulse propagation phenomena beyond the limits of slowly-varying envelope (SVEA) and rotating-wave approximation (RWA) are illustrated as the formation of full Maxwell-Bloch half-cycle solitons and two-soliton pulses.
We demonstrated that optical subcycle pulses can be generated in dense media of two-level systems due to pulse splitting and reshaping of pulses of a few optical-cycles time duration. Novel features in the spectral signatures of the pulses are predicted, a large blueshift in the transmitted and a large redshift in the reflected pulse, which are explained by intrapulse four-wave mixing. Solitary propagation phenomena in the full Maxwell-Bloch equations beyond the limits of slowly varying envelope and rotating-wave approximations are observed, e.g., the formation of solitary half-cycle pulses and two-soliton pulses.
The propagation behaviors, which include the carrier-envelope phase, the area evolution and the solitary pulse number of few-cycle pulses in a dense two-level medium, are investigated based on full-wave Maxwell-Bloch equations by taking Lorentz local field correction (LFC) into account. Several novel features are found: the difference of the carrier-envelope phase between the cases with and without LFC can go up to pi at some location; although the area of ultrashort solitary pulses is lager than 2pi, the area of the effective Rabi frequency, which equals to that the Rabi frequency pluses the product of the strength of the near dipole-dipole (NDD) interaction and the polarization, is consistent with the standard area theorem and keeps 2pi; the large area pulse penetrating into the medium produces several solitary pulses as usual, but the number of solitary pulses changes at certain condition.