Claire Gmachl, Jérôme Faist, Federico Capasso, Deborah L. Sivco, James N. Baillargeon, and Alfred Y. Cho, Bell Laboratories, Lucent Technologies, Murray Hill, N.J.
The characteristic absorption lines of most target gases and pollutants in atmospheric sensing applications lie between 3-13 μm wavelengths. Quantum cascade (QC) lasers, are based on an intersubband transition within the conduction band of a cascaded InGaAs/InAlAs multiple quantum-well structure and grown by molecular beam epitaxy (MBE). They are the only available semiconductor laser sources operating in that wavelength range at room temperature (RT), with peak output power up to several 100 mW. These lasers are driven in pulsed mode and their spectrum is inherently multiple-mode.
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