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Electrically tunable group delays using quantum wells in a distributed Bragg reflector

机译:在分布式布拉格反射器中使用量子孔的电调谐组延迟

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We present an optical delay line structure incorporating In$-x$/Ga$-1$MIN@x$/As quantum wells in the GaAs quarter- wave layers of a GaAs/AlAs distributed Bragg reflector. Applying an electric field across the quantum wells shifts and broadens the e1-hh1 exciton peak via the quantum- confined Stark effect. Resultant changes in the index of refraction thereby provide a means for altering the group delay of an incident laser pulse. Theoretical results predict tunable delays on the order of 50 fs for a 30-period structure incorporating 3 quantum wells per GaAs layer. Structure design, growth and fabrication are detailed. Preliminary group delay measurements on large-area samples with no applied bias are presented.
机译:我们介绍了一种在GaAs / Alas分布式布拉格反射器的GaAs / AlaS分布式布拉格反射器的GaAs季度波浪层中以$-x $ / ga $ -1 $ min @ $ /作为量子阱的光学延迟线结构。在量子阱上施加电场通过量子狭窄的颗粒效应换液相传并拓宽E1-HH1激子峰。由此产生的折射率的变化提供了一种用于改变入射激光脉冲的组延迟的装置。理论结果预测,对于包含每个GaAs层的30周期结构的30 fs的调节延迟。结构设计,生长和制造是详细的。提出了没有应用偏置的大面积样本的初步组延迟测量。

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