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Gain measurements on GaAs-based quantum cascade lasers using a two-section cavity technique

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6 Author(s)
Barbieri, S. ; Lab. Central de Recherches, Thomson-CSF, Orsay, France ; Sirtori, Carlo ; Page, H. ; Beck, M.
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A two-section cavity device has been used to measure gain spectra and waveguide losses of a GaAs-based quantum cascade laser. The device operates at 8.9 /spl mu/m and optical confinement is obtained by means of Al-free cladding layers. We investigated the gain characteristics in a spectral window of /spl sim/60 meV and up to 200 K. For current densities ranging from 1 to 8 kA/cm/sup 2/, we report a constant gain coefficient of 13 cm/kA at 4 K and 6 cm/kA at 200 K. At low temperatures and for current densities above 8 kA/cm/sup 2/, we observe gain saturation which we attribute to a reduced electron injection in the active region caused by space charge effects. We report a value of 22 cm/sup -1/ for the waveguide losses in good agreement with previous measurements.

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Quantum Electronics, IEEE Journal of  (Volume:36 ,  Issue: 6 )