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A modulated far-IR technique is applied to determine the separations of the confined electron and hole states in a 1.3μm emitting self-assembled quantum-dot laser. By utilizing the unusual temperature behavior of the threshold current density, which exhibits a minimum at ∼200K, 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±1meV, respectively, are determined.
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Sellers et al. (2006) studied this question.
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