Abstract
Quantum cascade lasers operating at λ > 20 μm wavelength are reported. Pulsed operation was obtained up to 140 K with a peak power of 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, but we also report on a 21.5 μm wavelength laser based on a double-sided interface-plasmon waveguide. This latter, contrary to the single-sided surface plasmon, is a viable waveguiding solution in the THz range, i.e. at wavelengths between 60 and 100 μm. Finally, intersubband electroluminescence is reported in a quantum cascade structure based on asymmetric superlattice active regions and designed for emission in the THz range at λ ≈ 80 μm.
Original language | English (US) |
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Pages (from-to) | 848-853 |
Number of pages | 6 |
Journal | Physica E: Low-Dimensional Systems and Nanostructures |
Volume | 13 |
Issue number | 2-4 |
DOIs | |
State | Published - Mar 2002 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
Keywords
- Semiconductor laser
- Stimulated emission