Abstract
A metal–metal waveguide quantum cascade laser with an abutted silicon hyperhemispherical lens is demonstrated at . The device produced of peak pulsed power at with a wall-plug power efficiency of 0.7%, lasing up to a maximum operating temperature of . The far-field beam pattern has a full width at half-maximum value of in the H plane. The same device produced of peak power using a Winston cone instead of a lens, lasing up to . The large increase in output power is mainly attributed to an increase in collection efficiency.
© 2007 Optical Society of America
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