High-power and high-temperature THz quantum-cascade lasers based on lens-coupled metal-metal waveguides.
A metal-metal waveguide quantum cascade laser with an abutted silicon hyperhemispherical lens is demonstrated at ~4.1 THz. The device produced 145 mW of peak pulsed power at 5 K with a wall-plug power efficiency of 0.7%, lasing up to a maximum operating temperature of 160 K. The far-field beam pattern has a full width at half-maximum value of ~4.8 degrees in the H plane. The same device produced ~26 mW of peak power using a Winston cone instead of a lens, lasing up to 165 K. The large increase in output power is mainly attributed to an increase in collection efficiency.
Wei Min Lee
Alan
A
Massachusetts Institute of Technology, MA 02139, USA. awmlee@mit.edu
Qin
Qi
Q
Kumar
Sushil
S
Williams
Benjamin S
BS
Hu
Qing
Q
Reno
John L
JL