Abstract

The currently critical issue of terahertz quantum cascade lasers (THz QCLs) ^[1,2] applications is the limited operation temperature and need for the cryogenic cooling below ~200 K ^[3]. In order to improve the design freedom and toward higher operation temperature, here we combine success design ideas used in mid-infrared QCLs. And present a following experiment result of modulation barrier heights Al_xGa_{1_x}As/Al_yGa_{1_y}As THz QCLs operated up to 145 K at 3.7 THz by rearrange the previous presented design of modulation Al barriers heights THz QCLs with multiple frequency lasing and poor temperature operation.

© 2015 Japan Society of Applied Physics, Optical Society of America