Abstract

Mid-infrared vertical external cavity surface emitting lasers (VECSELs) for 5μm in wavelength have been realized. The active parts are of a simple structure, either a 2μm thick PbTe gain layer or two 150nm PbTe layers embedded in Pb1xEuxTe barriers. Epitaxial 2.5 pair Pb1yEuyTeBaF2 Bragg mirrors are employed to form the cavity, and an Al layer is deposited for improved heat dissipation. Emission up to 300mWp is observed with microsecond pulses or 3mW cw at 100K is obtained. Quantum efficiency is up to 14%, and lasing occurs up to 175K when pumped with a 1.55μm wavelength pump laser.

© 2008 Optical Society of America

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