Quantum cascade lasers that emit more light than heat
Quantum cascade lasers that emit more light than heat
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DOI：
10.1038/nphoton.2009.263
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发表时间：
2010-02-01
期刊：
影响因子：
35
通讯作者：
Razeghi, Manijeh
中科院分区：
文献类型：
--
作者：
Bai, Yanbo;Slivken, Steven;Razeghi, Manijeh
对于任何半导体激光器，壁插效率，即注入电能中可以转换为输出光能的部分，是最重要的品质因数之一。具有较高壁插效率的装置由于其减少的自加热而具有较低的功率需求和延长的装置寿命。自其发明以来，量子级联激光器（1）的功率性能已经极大地改善（2-7）。然而，尽管内部量子效率（7，8）可以在低温下被设计为大于80%，但量子级联激光器的壁插效率从未在任何温度下被证明超过50%。迄今为止报道的最佳壁塞效率在120 K时为36%（参考文献9）。在这里，我们克服了使用单井注入器设计的限制因素，并证明在40 K时具有5 μ m的发射波长的53%的壁塞效率。换句话说，我们展示了一个量子级联激光器，它产生的光比热多。
For any semiconductor lasers, the wall plug efficiency, that is, the portion of the injected electrical energy that can be converted into output optical energy, is one of the most important figures of merit. A device with a higher wall plug efficiency has a lower power demand and prolonged device lifetime due to its reduced self-heating. Since its invention, the power performance of the quantum cascade laser(1) has improved tremendously(2-7). However, although the internal quantum efficiency(7,8) can be engineered to be greater than 80% at low temperatures, the wall plug efficiency of a quantum cascade laser has never been demonstrated above 50% at any temperature. The best wall plug efficiency reported to date is 36% at 120 K (ref. 9). Here, we overcome the limiting factors using a single-well injector design and demonstrate 53% wall plug efficiency at 40 K with an emitting wavelength of 5 mu m. In other words, we demonstrate a quantum cascade laser that produces more light than heat.