Single-mode operation of terahertz quantum cascade lasers with distributed feedback resonators
2004; American Institute of Physics; Volume: 84; Issue: 26 Linguagem: Inglês
10.1063/1.1767957
ISSN1520-8842
AutoresLukas Mahler, Rüdeger Köhler, Alessandro Tredicucci, Fabio Beltram, Harvey E. Beere, E. H. Linfield, D. A. Ritchie, A. G. Davies,
Tópico(s)Atmospheric chemistry and aerosols
ResumoDistributed feedback terahertz quantum-cascade lasers emitting at 4.34 and 4.43THz are presented. Mode selection is based on a complex-coupling scheme implemented into the top-contact layer by a combination of wet chemical etching and ohmic-contact deposition. Single-mode emission stable at all injection currents and operating temperatures is shown, with a side-mode suppression ratio exceeding 20dB. Peak output powers of up to 1.8mW are obtained at low temperatures.
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