Resonant and nonresonant tunneling injection of charge carriers in a quantum dot optical gain medium in the form of an optical amplifier operating in the telecom wavelength range were identified using multiwavelength pump–probe measurements. Since the inhomogeneously broadened ensemble of quantum dots exhibits a very wide spectrum of transition energies, these two tunneling injection processes take place simultaneously at different spectral locations and thus can be identified. These findings highlight the fact that at least one of the tunneling processes must occur at a wavelength at or near the gain peak, where laser oscillations take place. Energetic misalignment leads to reduced laser performance since in that case the tunneling process becomes a carrier loss mechanism.

中文翻译：

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量子点光学增益介质中的共振和非共振隧穿注入工艺

使用多波长泵浦-探针测量可以识别在电信波长范围内工作的光放大器形式的量子点光增益介质中电荷载流子的共振和非共振隧穿注入。由于量子点的非均匀加宽集合显示出非常宽的跃迁能谱，因此这两个隧穿注入过程同时在不同的光谱位置发生，因此可以被识别。这些发现突出了这样一个事实，至少一个隧穿过程必须发生在发生激光振荡的增益峰值处或附近的波长处。高能失准会导致激光器性能下降，因为在这种情况下，隧穿过程成为载流子损耗机制。