Very low threshold operation of quantum cascade lasers*
Yan Fang-Liang, Zhang Jin-Chuan†, Yao Dan-Yang, Liu Feng-Qi‡, Wang Li-Jun, Liu Jun-Qi, Wang Zhan-Guo
       
The cw power–current–voltage characteristics of the QCL operated in cw mode at different heat sink temperatures between 20 °C and 60 °C along with V – I curves at 20 °C.