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We report single spatial mode diode lasers operating near 2.05 μm with room-temperature continuous-wave output power exceeding 100 mW. At 20 °C, threshold currents were near 25 mA (320 A/cm2).
We present electroluminescence from ZnCdSe/ZnCdMgSe Quantum Cascade structures, with 3 times higher luminescence efficiency, 30% narrower electroluminescence linewidths than our first demonstration. The measured turn-on voltage matches with the calculated value.
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.
A spectroscopic detection of molecular dispersion based on frequency-chirped laser is presented. Unlike non-linear direct absorption methods yielding line saturation, this method provides linear signal response and accuracy over a wide range of sample concentrations.
We study the heat removal capability of different core structures in quantum cascade lasers. We find that due to non-isotropic conductivity, core structures with higher depth dissipate heat faster than the conventional higher-width structures.
The loss due to excited-state absorption into the continuum was calculated for high-power mid-infrared quantum cascade lasers. We find this loss to be a significant fraction of the gain at the laser wavelength.
We study the heat removal capability of different core structures in quantum cascade lasers. We find that due to non-isotropic conductivity, core structures with higher depth dissipate heat faster than the conventional higher-width structures.
A two-wavelength Quantum Cascade laser is reported in which one wavelength lases between subband states high in the k-space. Laser action at the two wavelengths is strongly anti-correlated in output power and threshold behaviour.
The loss due to excited-state absorption into the continuum was calculated for high-power mid-infrared quantum cascade lasers. We find this loss to be a significant fraction of the gain at the laser wavelength.
We demonstrate a quantum cascade laser employing two different injector regions and matched 4.6μm optical transitions for low-voltage-defect operation. The laser has a pulsed wall-plug efficiency of 19% at 80K and operates pulsed at 300K.
We show electrically-pumped transverse magnetic polarized intersubband emission from a ZnCdSe/ZnCdMgSe quantum cascade structure grown lattice-matched on InP. Electroluminescence centered near 4.8 μm was observed, in good agreement with calculations.
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