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首页> 美国卫生研究院文献>Light Science Applications >Pulse generation with ultra-superluminal pulse propagation in semiconductor heterostructures by superradiant-phase transition enhanced by transient coherent population gratings
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Pulse generation with ultra-superluminal pulse propagation in semiconductor heterostructures by superradiant-phase transition enhanced by transient coherent population gratings

机译：瞬态相干种群光栅增强的超辐射相变在半导体异质结构中产生超超发光脉冲传播的脉冲

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This paper reports the observation of ultra-superluminal pulse propagation in multiple-contact semiconductor heterostructures in a superradiant emission regime, and shows definitively that it is a different class of emission from conventional spontaneous or stimulated emission. Coherent population gratings induced in the semiconductor medium under strong electrical pumping have been shown to cause a major decrease of the group refractive index, in the range of 5–40%. This decrease is much greater than that caused by conventional carrier depletion or chirp mechanisms. The decrease in refractive index in turn causes faster-than-c propagation of femtosecond pulses. The measurement also proves the existence of coherent amplification of electromagnetic pulses in semiconductors at room temperature, the coherence being strongly enhanced by interactions of the light with coherent transient gratings locked to carrier gratings. This pulse-generation technique is anticipated to have great potential in applications where highly coherent femtosecond optical pulses must be generated on demand.
机译：本文报道了在超辐射发射条件下多触点半导体异质结构中超超发光脉冲传播的观察结果，并明确表明它是与常规自发或受激发射不同的发射类别。在强电泵浦下，在半导体介质中感应出的相干晶格光栅已引起群折射率的大幅下降，幅度在5％至40％之间。这种降低远大于常规载流子耗尽或线性调频机制引起的降低。折射率的降低又导致飞秒脉冲的传播快于c。该测量还证明了室温下半导体中电磁脉冲的相干放大的存在，通过光与锁定到载波光栅的相干瞬态光栅的相互作用，相干性得到了极大增强。预期这种脉冲产生技术在必须按需产生高度相干的飞秒光脉冲的应用中具有巨大的潜力。

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