Low-threshold quantum-cascade lasers at 3.5 THz (lambda = 85 microm).
作者： Rüdeger Köhler , Alessandro Tredicucci , Fabio Beltram , Harvey E. Beere , Edmund H. Linfield
DOI: 10.1364/OL.28.000810
关键词:
摘要: Chirped-superlattice quantum-cascade lasers are reported that emit at λ∼85 µm (3.5 THz), which is to the authors’ knowledge longest wavelength demonstrated so far with this technology. Collected peak output powers of 1.5 mW per facet were measured liquid-helium temperature, and a maximum operating temperature 45 K was reached. Record low-threshold-current densities 95 115 A cm-2 observed in pulsed continuous-wave operation, respectively. For latter, few hundred microwatts estimated low temperatures.
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