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Broadband quantum cascade laser gain medium based on a “continuum-to-bound” active region design
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View: Figures


Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

EL spectra at (a) and (b) at various applied electrical fields as indicated.

Image of FIG. 4.
FIG. 4.

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.

Image of FIG. 5.
FIG. 5.

(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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Broadband quantum cascade laser gain medium based on a “continuum-to-bound” active region design