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Frequency modulation of an electric field inside of an active medium with a very short gain recovery lifetime has become of recent interest due to the observed and calculated behavior of Quantum Cascade lasers (QCLs) exploiting optical nonlinearities to generate frequency combs in the spectral domain. Thus, in support of better understanding this behavior, we have investigated the effects of stochastic,...
The Photoluminescence spectra and lifetime of Fe2+ doped ZnSe crystal with quantum cascade laser pumping is measured. At room temperature the photoluminescence lifetime is ∼ 0.38 μs, which increases to ∼ 100 μs at 80K.
An analytical model for Quantum Cascade lasers based on rate equations adequately reproduces major transport and lasing characteristics, including the reduction of the differential resistance at threshold, saturation, and temperature performance.
Due to interface roughness scattering, the lower laser state depopulation lifetime of Quantum Cascade lasers can be significantly reduced (e.g. from 0.25 to 0.09 picosecond theoretically) by placing additional interfaces strategically in the active region.
Room temperature photoluminescence in Fe:ZnSe is observed under near-absorption-edge Quantum Cascade Laser (QCL) pumping. Both the spectral characteristics (λpeak ≈ 4.7 μm) and the luminescence lifetime (τ ≈ 0.38 us) are measured.
We analyze the temperature dependence of the transparency current density in mid-infrared quantum cascade lasers and assess its contribution to measured threshold current density for a laser with low voltage defect.
We use a density-matrix framework to evaluate the wallplug efficiency of mid-infrared quantum cascade lasers. We assess the limitations to maximum current and internal efficiency, imposed by injection coupling and current leakage, respectively.
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