Far-infrared surface-plasmon quantum-cascade lasers at 21.5 μm and 24 μm wavelengths

Quantum-cascade lasers operating above 20 μm (at λ∼21.5 μm and λ∼24 μm) wavelength are reported. Pulsed operation was obtained up to 140 K and with a peak power of a few milliwatts at cryogenic temperatures. Laser action originates from interminiband transitions in “chirped” superlattice active regi...

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Veröffentlicht in:Applied physics letters 2001-04, Vol.78 (18), p.2620-2622
Hauptverfasser: Colombelli, Raffaele, Capasso, Federico, Gmachl, Claire, Hutchinson, Albert L., Sivco, Deborah L., Tredicucci, Alessandro, Wanke, Michael C., Sergent, A. Michael, Cho, Alfred Y.
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Sprache:eng
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Zusammenfassung:Quantum-cascade lasers operating above 20 μm (at λ∼21.5 μm and λ∼24 μm) wavelength are reported. Pulsed operation was obtained up to 140 K and with a peak power of a few milliwatts at cryogenic temperatures. Laser action originates from interminiband transitions in “chirped” superlattice active regions. The waveguides are based on surface-plasmon modes confined at a metal–semiconductor interface. The wavelengths were chosen in order to avoid major phonon absorption bands, which are particularly strong at energies just above the reststrahlen band. We also report on a 21.5-μm-wavelength laser based on a two-sided interface-plasmon waveguide.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1367304