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Pulsed and continuous-wave operation of long wavelength infrared (λ=9.3 μm) quantum cascade lasers

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6 Author(s)
C. Sirtori ; Bell Lab., Lucent Technol., Murray Hill, NJ, USA ; J. Faist ; F. Capasso ; D. L. Sivco
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The operation of quantum cascade lasers at a wavelength (λ≃9.3 μm) well within the 8-13-μm atmospheric window is reported. A detailed study of intersubband luminescence in a vertical transition structure shows linewidths as narrow as ~10 meV at cryogenic temperatures, increasing to 20 meV at room temperature. Pulsed operation is demonstrated up to 220 K with a peak power ≈10 mW and ≈35 mW at 140 K. The temperature dependence of the threshold current density (J th) is described by a high T0 (128 K), Jth is also systematically studied as a function of cavity length to determine the peak gain and waveguide losses. Continuous-wave, single-mode operation is demonstrated up to 30 K with powers ≈2 mW

Published in:

IEEE Journal of Quantum Electronics  (Volume:33 ,  Issue: 1 )