Room temperature quantum cascade lasers with 22% wall plug efficiency in continuous-wave operation

Optics Express
F WangManijeh Razeghi

Abstract

We report the demonstration of quantum cascade lasers (QCLs) with improved efficiency emitting at a wavelength of 4.9 µm in pulsed and continuous-wave (CW) operation. Based on an established design and guided by simulation, the number of QCL-emitting stages is increased in order to realize a 29.3% wall plug efficiency (WPE) in pulsed operation at room temperature. With proper fabrication and packaging, a 5-mm-long, 8-µm-wide QCL with a buried ridge waveguide is capable of 22% CW WPE and 5.6 W CW output power at room temperature. This corresponds to an extremely high optical density at the output facet of ∼35 MW/cm2, without any damage.

References

Apr 22, 1994·Science·J FaistA Y Cho
Apr 4, 2015·Optics Express·Miriam Serena VitielloPaolo De Natale

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