Abstract

A metal–metal waveguide quantum cascade laser with an abutted silicon hyperhemispherical lens is demonstrated at 4.1THz. The device produced 145mW of peak pulsed power at 5K with a wall-plug power efficiency of 0.7%, lasing up to a maximum operating temperature of 160K. The far-field beam pattern has a full width at half-maximum value of 4.8° in the H plane. The same device produced 26mW of peak power using a Winston cone instead of a lens, lasing up to 165K. The large increase in output power is mainly attributed to an increase in collection efficiency.

© 2007 Optical Society of America

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