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High performance “continuum-to-continuum” quantum cascade lasers with a broad gain bandwidth of over
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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-continuum design at an electric field of 69 kV/cm. The layer sequence of one period (starting from the extraction barrier “E,” in angstrom) is 20/ 26/ 21/ 25/21/ 23/ 23/ 21/ 23/ 20/ 25/ 17/ 27/ 17/ 30/ 13/ 11/ 39/ 14/ 38/ 14/ 33, where barrier layers are in bold, well layers are in normal font and the underlined layers are doped .

Image of FIG. 2.
FIG. 2.

EL spectra at at various applied electrical fields as indicated.

Image of FIG. 3.
FIG. 3.

(a) Measured EL FWHM of the continuum-to-continuum design (300 K: squares, 80 K: triangles) and a conventional high performance design (300 K: open circles, 80 K: open triangles). The arrows indicate laser thresholds. (b) Calculated peak energies of dominant transitions (solid squares) and measured energies at EL half maxima (open squares) of the continuum-to-continuum design.

Image of FIG. 4.
FIG. 4.

(a) Light-current-voltage characteristics of a QC laser ( wide, 3 mm long, total peak power from both as-cleaved facets) at different temperatures in pulsed mode (frequency: 5 kHz, pulse width: 100 ns). (b) Threshold current density, WPE, and slope efficiency of ridge lasers of different dimensions (cavity length: 1.5–3.3 mm, ridge width: ) with as cleaved facets. The measured single-facet output power is doubled for two facet (a process we have tested to be valid for as-cleaved Fabry–Perot QC lasers) and corrected for an optical collection efficiency of 74% (verified by comparing the collected power with our two-lenses measurement setup and that obtained by putting the thermopile detector close to the laser front facet).

Image of FIG. 5.
FIG. 5.

WPE and total output power of a BH laser ( wide, 4 mm long) at 80 K and room temperature in pulsed (frequency: 5 kHz, pulse width: 100 ns) and cw mode operation. The measured single-facet optical power is doubled for two facets and corrected for an optical collection efficiency of 74%.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High performance “continuum-to-continuum” quantum cascade lasers with a broad gain bandwidth of over 400 cm−1