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Conduction band diagram of a portion of the active regions and injectors and the moduli squared of the relevant wave functions of the continuum-to-bound design under an electric field of 39 kV/cm. The designed emission wavelength is around at . The layer sequence of one period (starting from the extraction barrier, in angstrom) is , where barrier layers are in bold, well layers are in normal font and the underlined layers are doped (Si, ). The laser transition is indicated by the arrow.
Calculated (solid line) and experimental (dashed line) EL (normalized) at an applied electric field of 39 kV/cm at (a) 80 K and (b) 295 K. The x-axes in (a) are offset by to overlay the calculated and experimental EL line shapes for better comparison.
EL spectra at (a) and (b) at various applied electrical fields as indicated.
Measured EL FWHM of the continuum-to-bound design A (295 K: triangles, 80 K: solid squares), design B (circles) and a conventional two-phonon resonance design (open squares). The open circles indicate the laser threshold and the open squares indicate the power rollover.
(a) Light-current-voltage characteristics of a QC laser before and after AR coating at room temperature in pulsed mode. (b) Tuning of the external cavity laser and EL (dashed line) at a current density of at in pulsed mode.
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