Incoherent spatial solitons

Qian Kong, Ming Shen, Jielong Shi +1 more

Carlo F. Barenghi, Nick G. Parker

V. B. Taranenko, Carl O. Weiss

We describe experiments showing the existence of spatial solitons in semiconductor microresonators. We describe the manipulation of such solitons in view of technical applications: switching solitons on and off by coherent, as well as incoherent light, reducing the light power necessary to sustain and switch a soliton by optical pumping, and the limit in which independent solitons become so strongly bound that they form a coherent hexagonal pattern, marking the maximum information storage density.

Lincoln D. Carr, J. Brand

Éric Lantz, Thibaut Sylvestre, H. Maillotte +2 more

We apply the Green function method to determine the global degree of squeezing and the transverse spatial distribution of quantum fluctuations of solitons in Kerr media. We show that both scalar bright solitons and multimode vector solitons experience strong squeezing on the optimal quadrature. For vector solitons, this squeezing is shown to result from an almost perfect anti-correlation between the fluctuations in the two incoherently coupled circular polarizations.

Liang Li, Guoxiang Huang

We present a systematic theoretical study to deal with linear and nonlinear light propagations in a Doppler-broadened three-level $\ensuremath{\Lambda}$ system via electromagnetically induced transparency (EIT), with incoherent population exchange between two lower energy levels taken into account. Through a careful analysis of base state and linear excitation, we show that the EIT condition of the system is given by $|{\ensuremath{\Omega}}_{c}|{}^{2}{\ensuremath{\gamma}}_{31}\ensuremath{\gg}2{\ensuremath{\gamma}}_{21}\ensuremath{\Delta}{\ensuremath{\omega}}_{D}^{2}$, where ${\ensuremath{\Omega}}_{c}$ is half the Rabi frequency of the control field, $\ensuremath{\Delta}{\ensuremath{\omega}}_{D}$ is the Doppler width, and ${\ensuremath{\gamma}}_{\mathit{jl}}$ is the decay rate of the coherence between states $|j\ensuremath{\rangle}$ and $|l\ensuremath{\rangle}$. Under this condition, the effect of incoherent population exchange is insignificant, while dephasing dominates the decoherence of the system. This condition also ensures the validity of the weak nonlinear perturbation theory used in this work for solving the Maxwell-Bloch equations with inhomogeneous broadening. We then investigate the nonlinear propagation of the probe field and show that it is possible to form temporal optical solitons in the Doppler-broadened medium. Such solitons have ultraslow propagating velocity and can be generated in very low light power. The possibility of realizing ($1+1$)-dimensional and ($2+1$)-dimensional spatial optical solitons in the adiabatic regime of the system is also discussed.