Lateral distributed-feedback gratings for single-mode, high-power terahertz quantum-cascade lasers

Optics Express
M WienoldH T Grahn

Abstract

We report on terahertz quantum-cascade lasers (THz QCLs) based on first-order lateral distributed-feedback (lDFB) gratings, which exhibit continuous-wave operation, high output powers (>8 mW), and single-mode emission at 3.3-3.4 THz. A general method is presented to determine the coupling coefficients of lateral gratings in terms of the coupled-mode theory, which demonstrates that large coupling strengths are obtained in the presence of corrugated metal layers. The experimental spectra are in agreement with simulations of the lDFB cavities, which take into account the reflective end facets.

References

May 10, 2002·Nature·Rüdeger KöhlerFausto Rossi
Mar 24, 2004·Optics Letters·A BarkanD A Ritchie
Jul 25, 2005·Optics Express·Heinz-Wilhelm HübersE Linfield
Apr 15, 2010·Optics Express·Maria I AmantiJerome Faist

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Citations

Mar 20, 2018·Nature Communications·Simone BiascoMiriam S Vitiello

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