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Two separate contacts are incorporated into the different arms of Quantum Cascade lasers with asymmetric Mach-Zehnder interferometer type cavities. Preliminary results reveal an almost-continuous single mode tuning range of 20 cm−1 at 80K.
The idea of integrating an asymmetric Mach-Zehnder interferometer in Quantum Cascade laser cavities to introduce mode selectivity is proposed and analyzed. Preliminary results show narrowing of the laser spectra with such cavities.
Application of a shallow distributed Bragg reflector ion-milled on a tenth of the laser ridge leads to spectral narrowing, a 10-fold reduction in full-width-half-maximum and ∼12dB side mode suppression, of Fabry-Perot type QC lasers.
This paper reports a tunable three-dimensional (3D) liquid-liquid waveguide laser constructed by two flow streams in a microchannel. It comprises a 3D dye dissolved liquid-liquid waveguide as gain medium and gold (Au) mirrors to provide feedback. The 3D liquid-liquid waveguide is highly efficient to overcome the optical loss as compared with liquid-liquid three-dimensional (2D) waveguide. The lasing...
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 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.
This paper reports a miniature MEMS tunable dual-wavelength laser by integrating a gain chip, a beam splitter, and a pair of Bragg reflectors which has different periods. In the experiment, simultaneous two wavelengths emissions are observed with a thermo-optic tuning range of 1574.7 nm to 1578.6 nm and 1576.1 nm to 1582.6 nm, respectively.
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