Far-infrared surface-plasmon quantum-cascade lasers at 21.5 μm and 24 μm wavelengths
- 25 April 2001
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 78 (18) , 2620-2622
- https://doi.org/10.1063/1.1367304
Abstract
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.Keywords
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