Chen Y, Atai J
Opt Lett. 1991 Dec 15;16(24):1933-5. doi: 10.1364/ol.16.001933.
Propagation of dark solitons in nonlinear media that include gain and loss is investigated. Two-photon absorption is shown to lead to dark-soliton broadening and attenuation, whereas gain (such as that arising from stimulated Raman scattering) is shown to lead to their narrowing and amplification. The relations describing the adiabatic evolution of dark solitons in the weakly perturbed media are presented. In comparison with fundamental bright solitons, dark solitons are shown to be less sensitive to the perturbations. Stationary propagation of dark solitons is also found to be possible in the presence of both absorption and amplification, but it differs from that in the passive lossless nonlinear media.
研究了暗孤子在包含增益和损耗的非线性介质中的传播。结果表明，双光子吸收会导致暗孤子展宽和衰减，而增益（如受激拉曼散射产生的增益）会导致暗孤子变窄和放大。给出了描述弱扰动介质中暗孤子绝热演化的关系式。与基本亮孤子相比，暗孤子对扰动不太敏感。还发现在同时存在吸收和放大的情况下暗孤子也可能实现稳态传播，但这与无源无损非线性介质中的情况不同。
