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Two different ultra-strong coupling Quantum Cascade laser designs and their modified versions with two taller electron exit barriers are compared experimentally to study the influence of such taller electron exit barriers on the device performance.
Single-mode Quantum Cascade lasers employing a candy-cane shaped Fabry-Perot cavity are demonstrated. Single-mode emission with ∼25 dB side mode suppression is achieved up to ∼500 mA above threshold current in pulsed operation.
We demonstrate single mode operation of Quantum Cascade lasers employing a folded Fabry-Perot resonator waveguide design. Single mode emission is achieved with ∼20dB side mode suppression up to ∼400mA above threshold current in pulsed operation.
We demonstrate a Quantum Cascade Laser employing ultra-strong (~20 meV) coupling between the injector and the upper laser state. The laser shows a pulsed wall-plug efficiency of 34%(8%) and peak power of 8.0 W(2.0 W) at 80 K(300 K).
We demonstrate a quantum cascade laser featuring a low-voltage-defect short injector. Devices showing a voltage-defect as low as 20 meV and voltage efficiency of 88% at 80 K are reported, with > 80% voltage efficiency at room temperature.
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