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We proposed and experimentally demonstrated an approach to achieving a narrow spectrum kilowatt-level fiber master oscillator power amplifier (MOPA). The MOPA is seeded by a narrow spectrum random laser with Yb-doped fiber gain and has the spectral broadening-free feature. The narrow spectrum property is sustained during power scaling due to the suppression of nonlinear process. The frequency and...
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.
Quantum Cascade lasers based on continuum-to-continuum design enable external cavity tuning over 340 cm−1 in pulsed mode operation at 15°C. Strong gain suppression over 320cm−1 is attributed to strong coupling between the laser transitions.
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 a quantum cascade laser for detecting 12CO2 and 12CO2 isotopes for use in fingerprinting CO2 emissions from sources such as power plants and carbon storage reservoirs. The lasers emit a single mode at 4.22 μm in continuous wave 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.
A thermoelectric effect is observed in quantum cascade lasers and validated through thermal/electrical transport modeling. Choosing the proper polarity leads to an active core heat reduction of 9 K for a 7.5 kW/cm2 thermal load.
Using low-duty cycle pulses superimposed on a DC current, we determine the type of power roll-over and obtain the instantaneous threshold current, current efficiency and core temperature of a quantum-cascade laser in continuous wave operation.
A new Quantum Cascade laser design with a ldquotwo-steprdquo coupling between the injector and the active region provides a voltage tuning range of 200 cm-1 for electroluminescence and 80 cm-1 for laser spectra at room temperature.
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