Guan Yanjiao, Wang Lijun, Zhuo Ning, Zhang Jinchuan, Zhai Shenqiang, Liu Junqi, Liu Shuman, Liu Fengqi
Opt Express. 2021 Nov 22;29(24):39376-39383. doi: 10.1364/OE.442507.
A dual-wavelength quantum cascade laser (QCL) with two shallow-etched distributed Bragg reflectors is designed and fabricated. Based on a heterogeneous active region within a single waveguide, single-mode emission at 7.6μm and 8.2μm was achieved. The two wavelengths can be independently controlled by selective current injection on different regions of the device, which are electrically isolated. High optical powers of about 275mW and 218mW at room temperature were obtained for the single-mode emission at 7.6μm and 8.2μm, respectively. The presented design concept for high power, dual-wavelength switchable, mid-infrared QCLs is significant in developing miniaturized multi-species gas detection systems.
