High power-efficiency terahertz quantum cascade laser
Li Yuan-Yuan, Liu Jun-Qi†, 
, Liu Feng-Qi‡, , Zhang Jin-Chuan, Zhai Shen-Qiang, Zhuo Ning, Wang Li-Jun, Liu Shu-Man, Wang Zhan-Guo
, Liu Feng-Qi‡, , Zhang Jin-Chuan, Zhai Shen-Qiang, Zhuo Ning, Wang Li-Jun, Liu Shu-Man, Wang Zhan-Guo (a) Plots of wall-plug efficiency versus temperature for 130-μm-wide Epi-down mounted devices with different cavity lengths. (b) Plots of slope efficiency versus temperature of the same devices at various temperatures.
