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Evidence of cascaded emission in a dual-wavelength quantum cascade laser
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View: Figures


Image of FIG. 1.
FIG. 1.

Conduction band diagram for the postcalibrated layer sequence. Cascaded optical transitions are between levels and . The single stage layer sequence is (in angstroms starting from the injection barrier) , where barrier layers are in bold, well layers are in normal font, and Si-doped layers are underlined. The injection barrier is labeled as .

Image of FIG. 2.
FIG. 2.

(a) Emission spectra of a long and wide laser at a heat sink temperature of operated with a current pulse width. The electric field across the active laser core is calculated from current-voltage measurements. (b) Electroluminescence spectra from a deep-etched semicircular mesa at various current and electric field values. Electroluminescence data were collected at with a current pulse width.

Image of FIG. 3.
FIG. 3.

Measured and calculated values of the optical transition energies in EL as a function of the electric field. Hollow circles represent the center points of multiLorentzian fits to the EL data as displayed in Fig. 2(b). Solid squares show the calculated transition energies.

Image of FIG. 4.
FIG. 4.

Electroluminescence spectrum at and without correction for detector responsivity or oscillator strength. The raw data are fitted with five Lorentzian peaks, with center points indicated by arrows. Theoretical calculations are given for an electric field of and are in excellent agreement with the data.

Image of FIG. 5.
FIG. 5.

Gated light vs current characteristics for (a) and (b) emissions from a long, wide laser. Using a boxcar gate, data were collected from different regions of an current pulse. The leading edge of the boxcar gate was positioned at 0, 10, 20, 30, 40 50, 60, and into the pulse, and a long pass filter with cutoff at was used to discriminate between and light. The inset in (a) shows light vs current data for the gate. The “” current vs voltage curve is shown in (b).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Evidence of cascaded emission in a dual-wavelength quantum cascade laser