Room-temperature, continuous-wave, single-mode quantum-cascade lasers at λ≃5.4 μm

Blaser, Stéphane; Yarekha, Dmitri A.; Hvozdara, Lubos; Bonetti, Yargo; Muller, Antoine; Giovannini, Marcella; Faist, Jürôme
January 2005
Applied Physics Letters;1/24/2005, Vol. 86 Issue 4, p041109
Academic Journal
We demonstrate room-temperature, single-mode, continuous-wave operation of a λ≃5.4 μm quantum-cascade laser up to the temperature of 30 °C. Processing is done using standard lithography in a ridge waveguide mounted junction-up. The active region is based on a bound-to-continuum transition. The high performances were achieved with a low active region doping and a thick electroplated gold deposition, resulting in a characteristic temperature of T0=155 K in continuous-wave with a threshold current density of jth=2.05 kA/cm2 at 300 K.


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