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Infrared modulated interlevel spectroscopy of 1.3 μm self-assembled quantum dot lasers using a free electron laser

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9 Author(s)
Sellers, I.R. ; Department of Physics and Astronomy, University of Sheffield. S3 7RH, United Kingdom ; Mowbray, D.J. ; Badcock, T.J. ; Wells, J.-P.R.
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A modulated far-IR technique is applied to determine the separations of the confined electron and hole states in a 1.3 μm emitting self-assembled quantum-dot laser. By utilizing the unusual temperature behavior of the threshold current density, which exhibits a minimum at ∼200 K, it is possible to eliminate heating effects associated with the far-IR pulses. In addition, the intense monochromatic laser output results in a relatively strong modulated signal strength. Electron and hole quantization energies of 46.7±0.2 and 13±1 meV, respectively, are determined.

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Applied Physics Letters  (Volume:88 ,  Issue: 8 )