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(a) Measured absorption spectra for temperatures of 70 and . The data are shifted for clarity. (b) Conduction band structure and square moduli of the wavefunctions for one period of each DQW structure.
Lasing threshold curves for both samples at for resonant excitation with a fit of the experimental data points for clarity. The inset shows the coupling geometry.
Peak position of the emission spectra vs pumping energy for samples A–C (points). The solid lines are the shifts expected from the absorption measurements. Sample C was designed to have a depopulation energy higher than double phonon resonance and is shown for completeness reasons but not discussed in further detail. For all samples, the shift of the peak emission with pumping wavelength follows the Raman shift. The inset shows the spectra of sample A over the whole tuning range.
Comparison between absorption and lasing tuning range for sample A (a) and sample B (b) at . The lines with symbols are the integrated spectra for the corresponding pump energy. The lines give the measured absorption spectra of the transition.
Transition energies, corresponding linewidth , and peak absorption obtained in multipass 45° waveguide geometry. Energies marked by * and ** are calculated from and , respectively.
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