Lu Quanyong, Slivken Steven, Wu Donghai, Razeghi Manijeh
Opt Express. 2020 May 11;28(10):15181-15188. doi: 10.1364/OE.393069.
In this work, we report high power continuous wave room-temperature operation single mode quantum cascade lasers in the mid-infrared spectral range from 3.8 to 8.3 µm. Single mode robustness and dynamic range are enhanced by optimizing the distributed feedback grating coupling design and the facet coatings. High power single mode operation is secured by circumventing the over-coupling issue and spatial hole burning effect. Maximum single-facet continuous-wave output power of 5.1 W and wall plug efficiency of 16.6% is achieved at room temperature. Single mode operation with a side mode suppression ratio of 30 dB and single-lobed far field with negligible beam steering is observed. The significantly increased power for single mode emission will boost the QCL applications in long-range free-space communication and remote sensing of hazardous chemicals.
在这项工作中，我们报道了在3.8至8.3微米中红外光谱范围内实现高功率连续波室温运行的单模量子级联激光器。通过优化分布反馈光栅耦合设计和腔面涂层，增强了单模稳健性和动态范围。通过规避过耦合问题和空间烧孔效应，确保了高功率单模运行。在室温下实现了最大单腔面连续波输出功率5.1瓦和壁插效率16.6%。观察到具有30分贝边模抑制比的单模运行以及具有可忽略光束转向的单瓣远场。单模发射功率的显著增加将推动量子级联激光器在远程自由空间通信和危险化学品遥感中的应用。
