Cheng Fengmin, Zhang Jinchuan, Guan Yanjiao, Yang Pengchang, Zhuo Ning, Zhai Shenqiang, Liu Junqi, Wang Lijun, Liu Shuman, Liu Fengqi, Wang Zhanguo
Opt Express. 2020 Nov 23;28(24):36497-36504. doi: 10.1364/OE.405528.
We report an ultralow power consumption of a quantum cascade laser (QCL) emitting at λ ∼ 4.6 µm operating in continuous-wave mode at room temperature. The ultralow power consumption is achieved by using a high gain active region and shortening the device size. For the device with a 0.5-mm-long cavity and 3.2-µm-wide ridge, the threshold power consumption is as low as 0.26 W with an optical output power of 12.6 mW at 10 °C in continuous-wave mode, which represents the world's most advanced level. Furthermore, the threshold power consumption varies linearly with the operating temperature, where the linear change rate of 2.3 mW/K from 10 to 40 °C is low. As a result, the devices also show low threshold power consumption values of 0.33 W even at 40 °C in continuous-wave mode with an optical output power of 6.1 mW. In addition, the lasers can maintain a single-mode operation due to the short cavity length even if no distributed feedback grating is applied.
我们报道了一种量子级联激光器（QCL）在室温下以连续波模式工作，发射波长约为4.6 µm时的超低功耗。通过使用高增益有源区和缩短器件尺寸实现了超低功耗。对于腔长为0.5 mm、脊宽为3.2 µm的器件，在10 °C下连续波模式下的阈值功耗低至0.26 W，光输出功率为12.6 mW，这代表了世界最先进水平。此外，阈值功耗随工作温度呈线性变化，在10至40 °C范围内线性变化率为2.3 mW/K，该变化率较低。结果，即使在40 °C下连续波模式且光输出功率为6.1 mW时，这些器件的阈值功耗也仅为0.33 W。此外，由于腔长较短，即使不应用分布反馈光栅，激光器也能保持单模工作。
