title: High-power and high-temperature THz quantum-cascade lasers based on lens-coupled metal-metal waveguides.
abstract: 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.
authors.affiliation: Massachusetts Institute of Technology, MA 02139, USA. awmlee@mit.edu
authors.forename: Alan
authors.initials: A
authors.lastname: Wei Min Lee
authors.forename: Qi
authors.initials: Q
authors.lastname: Qin
authors.forename: Sushil
authors.initials: S
authors.lastname: Kumar
authors.forename: Benjamin S
authors.initials: BS
authors.lastname: Williams
authors.forename: Qing
authors.initials: Q
authors.lastname: Hu
authors.forename: John L
authors.initials: JL
authors.lastname: Reno