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Opt Lett. 2007 Oct 1;32(19):2840-2.

High-power and high-temperature THz quantum-cascade lasers based on lens-coupled metal-metal waveguides.

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  • 1Massachusetts Institute of Technology, MA 02139, USA.


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.

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