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Rabi-oscillation-enhanced frequency conversion in quantum-dot semiconductor optical amplifiers

机译：量子点半导体光放大器中的振荡振荡增强型频率转换

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摘要

We investigate the nonlinear light propagation in InAs/InGaAs quantum-dot- in-a-well semiconductor optical amplifiers in the limit of strong optical excitation where Rabi oscillations are excited in the active medium. The amplifier is analyzed in a degenerate four-wave-mixing setup and characterized by its frequency conversion and creation performance. Our simulations show that the interplay between the nonlinear four-wave-mixing process and the coherent Rabi oscillations greatly influences the frequency conversion process. Rabi oscillations can be resonantly excited by the correct choice of the frequency detuning between pump and probe signals, which greatly enhances the nonlinear frequency conversion efficiency at frequencies up to several THz. We furthermore show that the coherent pulse shaping of ultrashort optical pulses in the quantum-dot medium can greatly enhance their spectral bandwidth, potentially allowing for ultra-broad-band frequency comb generation.
机译：我们在强光激发的限制下研究在有源介质中激发拉比振荡的InAs / InGaAs量子点阱半导体光放大器中的非线性光传播。在简并的四波混频设置中对放大器进行分析，并以其频率转换和创建性能为特征。我们的仿真表明，非线性四波混频过程与相干拉比振荡之间的相互作用极大地影响了频率转换过程。正确选择泵浦信号和探头信号之间的频率失谐可以使Rabi振荡共振，从而极大地提高了高达几个THz的频率下的非线性频率转换效率。我们进一步表明，量子点介质中超短光脉冲的相干脉冲整形可以大大增强其光谱带宽，从而有可能产生超宽带频率梳。

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