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Broadband mid-infrared quantum cascade lasers (QCLs) at ∼10 μm based on the continuum-to-continuum design are presented. The prototypes show broadband lasing spectra (978 cm−1–1055 cm−1), 580 mW peak powers and 0.5 W/A slope efficiencies.
Broadly tunable single-mode quantum cascade laser at ∼10 µm with a monolithically integrated two-section slot structure is presented. The device shows ∼80 cm−1 tuning range and ∼20 dB side mode suppression ratio by adjusting the currents and temperature.
A novel distributed feedback quantum cascade laser (DFB-QCL) modulated by traveling surface acoustic wave (SAW) is proposed and theoretically studied. The device is based on a highly piezoelectric Zinc Oxide (ZnO) thin film applied directly on top of the QCL to enhance the SAW modulation of the device. To increase the coupling efficiency between the optical lasing mode and the SAW-induced DFB grating,...
We report the design and demonstration of ∼14 µm quantum cascade lasers based on the three-phonon-resonance active region design. The as-cleaved device with 40 periods of active region and size of 3.8 mm×28µm shows ∼10 mW peak power at 280 K and maximum working temperature of 295 K. Due to the Stark effect, the laser wavelength blue-shifts from 13.75 to 13.4 µm for temperature changing from 200 K...
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