Ultrashort pulses in an inhomogeneously broadened two-level medium: soliton formation and inelastic collisions

Novitsky, Denis V.

doi:10.1088/0953-4075/47/9/095401

Cited by 15 publications

(8 citation statements)

References 37 publications

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“…In Section 3, the pulses are suggested to be long enough, so that the RWA violation cannot be connected with the processes on the single-cycle scale studied previously [22]. As to collisions of counter-propagating chirped pulses inside the medium, the present study continues our previous work where interaction of chirp-free pulses in both homogeneously and inhomogeneously broadened two-level media was analyzed [17,34,35]. It was shown that, changing intensity of the first pulse, one can effectively control the transmission of the second pulse.…”

Section: Introductionmentioning

confidence: 66%

Compression and collisions of chirped pulses in a dense two-level medium

Novitsky

2016

Optics Communications

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Using numerical simulations, we study propagation of linearly-chirped optical pulses in a homogeneously broadened two-level medium. We pay attention to the three main topics -- validity of the rotating-wave approximation (RWA), pulse compression, and collisions of counter-propagating pulses. The cases of long and single-cycle pulses are considered and compared with each other. We show that the RWA does not give a correct description of chirped pulse interaction with the medium. The compression of the chirp-free single-cycle pulse is stronger than of the chirped one, while the opposite is true for long pulses. We demonstrate that the influence of chirp on the collisions of the long pulses allows to control the state of the transmitted radiation: the transmission of the chirp-free pulse can be dramatically changed under collision with the chirped counter-propagating one, in sharp contrast to the case when both pulses are chirped. On the other hand, the collisions of the chirped single-cycle pulses can be used for precise control of medium excitation in a narrow spatial region.Comment: 7 pages, 7 figure

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Section: Introductionmentioning

confidence: 66%

Compression and collisions of chirped pulses in a dense two-level medium

Novitsky

2016

Optics Communications

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“…Although it was reported that kinks are preserved under inhomogeneous broad-ening [14], it may be interesting to test this prediction with our more general numerical approach adapting the scheme described in Ref. [28]. Since calculations in this paper were performed for two-level atoms in vacuum, a more general consideration is worth exploring, taking into account the background matrix (see, e.g., the study of its influence on mirrorless optical bistability [29]).…”

Section: Discussionmentioning

confidence: 99%

Optical kinks and kink-kink and kink-pulse interactions in resonant two-level media

Novitsky

2017

Phys. Rev. A

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An optical kink is a shock-wave-like field structure which can appear in a resonant two-level medium as a result of the nonlinear process of self-steepening. We numerically simulate this process using an adiabatically switching waveform as an input and confirm the self-similarity of resulting kinks. The analysis is also applicable to a more general waveform with a decaying trailing edge which we call a kinklike pulse. We study in detail collisions of kinks with other kinks and ultrashort pulses and demonstrate the possibility to control kink speed by changing the parameters of counterpropagating fields. The effects considered can be treated as belonging to a wide class of unexplored phenomena in the regime of incoherent light-matter interaction.

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“…Incident light pulses have the central wavelength

λ = 0.8

µm and the Gaussian envelope

Ω = {normalΩ}_{p} exp false(- t^{2} / 2 t_{p}^{2} false)

with the pulse duration of

t_{p} = 50

fs. For pulses of such short duration, we can safely neglect the influence of the near dipole–dipole interactions between the two‐level emitters as well as the inhomogeneous broadening . The peak Rabi frequency is given by

{normalΩ}_{p} = {normalΩ}_{0} = λ / \sqrt{2 π} c t_{p}

which corresponds to the pulse area of 2π (the 2π SIT pulse).…”

Section: Governing Equationsmentioning

confidence: 99%

Different Regimes of Ultrashort Pulse Propagation in Disordered Layered Media with Resonant Loss and Gain

2019

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Different optical nanostructures containing both loss and gain components attract ever-increasing attention as novel advanced materials and building blocks for a variety of nanophotonic and plasmonic applications. Unique tunable optical signatures of the so-called active metamaterials support their utilization for sensing, imaging, and signal processing on micro-and nanoscales. However, this tunability requires flexible control over the metamaterial parameters, which could be provided by involving a set of nonlinear interactions. In this paper, a method of governing ultrashort pulses is proposed by varying the level of a population difference disorder in a random active metamaterial. This enables us to deliver three different interaction regimes: self-induced transparency (low disorder), localization regime (moderate disorder), and light amplification (strong disorder) corresponding to strongly different light pulse speeds. Since this control could be realized via rather plain tools, like simple pump tuning, the proposed disordered medium opens a room of opportunities for designing a peculiar active component for a whole set of highly demanded optical applications.

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Ultrashort pulses in an inhomogeneously broadened two-level medium: soliton formation and inelastic collisions

Cited by 15 publications

References 37 publications

Compression and collisions of chirped pulses in a dense two-level medium

Compression and collisions of chirped pulses in a dense two-level medium

Optical kinks and kink-kink and kink-pulse interactions in resonant two-level media

Different Regimes of Ultrashort Pulse Propagation in Disordered Layered Media with Resonant Loss and Gain

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