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

F. Wang | Zendy; S. Slivken | Zendy; Donghai Wu | Zendy; Manijeh Razeghi | Zendy

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

Author(s) -

F. Wang,

S. Slivken,

Donghai Wu,

Manijeh Razeghi

Publication year - 2020

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.394916

Subject(s) - cascade , materials science , continuous wave , optics , laser , optoelectronics , quantum cascade laser , wavelength , fabrication , physics , medicine , chemistry , alternative medicine , chromatography , pathology

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/cm 2 , without any damage.

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