150-nm tuning range in a grating-coupled external cavityquantum-dot laser |
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Authors: | Li H. Liu G.T. Varangis P.M. Newell T.C. Stintz A. Fuchs B. Malloy K.J. Lester L.F. |
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Affiliation: | Center for High Technol. Mater., New Mexico Univ., Albuquerque, NM; |
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Abstract: | An antireflection (AR) coated single-stack quantum-dot (QD) laser in a grating-coupled external cavity is shown to operate across a tuning range from 1.095 μm to 1.245 μm. This 150-nm range extends from the energy levels of the ground state to excited states. At any wavelength, the threshold current density is no greater than 1.1 kA/cm 2. This large tunable range is the product of the rapid carrier filling of the higher energy states under a low pumping current and homogeneous broadening in the QD ensemble. The possibility of a larger tuning range is discussed with the further improvement of the AR-coating |
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