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Short-wavelength InP-based strain-compensated quantum-cascade laser
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View: Figures


Image of FIG. 1.
FIG. 1.

-, -, and -point conduction band edge energy profiles (thin black lines) of a single cascade calculated with an electric field of . The moduli square of the injector/extractor miniband states and the excited states are depicted using gray lines. Thick solid lines highlight the upper and the lower laser states 2 and 1, and the the injector-miniband state 3, that may contribute to the broadening of the emission spectrum.

Image of FIG. 2.
FIG. 2.

Low resolution emission spectra of the QCL driven with pulses ( , ) at (black) and (gray). Full widths at half maximum of the electroluminescence are at and at . High-resolution laser spectrum measured at the same drive conditions at is also shown (not to scale) with a black line for reference.

Image of FIG. 3.
FIG. 3.

Applied voltage across the laser structure together with the total peak emission power of the laser as functions of current. The laser is driven with (bias)/ (power) current pulses and the power is corrected for approximately 50% collection efficiency.

Image of FIG. 4.
FIG. 4.

Threshold current density, , vs heat sink temperature for a laser driven with current pulses. The solid line is an exponential fit in the temperature range used to determine the characteristic temperature . The inset shows a high resolution Fourier-transform spectrum measured just above the threshold at .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Short-wavelength (λ≈3.05μm) InP-based strain-compensated quantum-cascade laser