Quantum-cascade lasers operating above 20 mum (at lambda similar to 21.5 mum and lambda similar to 24 mum) 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-mum-wavelength laser based on a two-sided interface-plasmon waveguide. (C) 2001 American Institute of Physics.
|Autori:||Colombelli, R; Capasso, F; Gmachl, C; Hutchinson, Al; Sivco, Dl; Tredicucci, Alessandro; Wanke, Mc; Sergent, Am; Cho, Ay|
|Titolo:||Far-infrared surface-plasmon quantum-cascade lasers at 21.5 mu m and 24 mu m wavelengths|
|Anno del prodotto:||2001|
|Digital Object Identifier (DOI):||10.1063/1.1367304|
|Appare nelle tipologie:||1.1 Articolo in rivista|