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Impact of the carrier relaxation paths on two-state operation in quantum dot lasers

机译:载流子弛豫路径对量子点激光器二态工作的影响

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We study InGaAs QD laser operating simultaneously at ground (GS) and excited (ES) states under 30ns pulsed-pumping and distinguish three regimes of operation depending on the pump current and the carrier relaxation pathways. An increased current leads to an increase in ES intensity and to a decrease in GS intensity (or saturation) for low pump range, as typical for the cascade-like pathway. Both the GS and ES intensities are steadily increased for high current ranges, which prove the dominance of the direct capture pathway. The relaxation oscillations are not pronounced for these ranges. For the mediate currents, the interplay between the both pathways leads to the damped large amplitude relaxation oscillations with significant deviation of the relaxation oscillation frequency from the initial value during the pulse.
机译:我们研究了在30ns脉冲泵浦下同时在基态(GS)和激发态(ES)下工作的InGaAs QD激光器,并根据泵浦电流和载流子弛豫路径来区分三种工作模式。对于低泵浦范围,电流增加会导致ES强度增加,而GS强度(或饱和度)会降低,这是级联状路径的典型现象。对于高电流范围,GS和ES强度均稳定增加,这证明了直接捕获途径的优势。在这些范围内,弛豫振荡并不明显。对于中间电流,两条路径之间的相互作用会导致阻尼大振幅弛豫振荡,并且在脉冲过程中弛豫振荡频率会与初始值发生明显偏差。

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