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

F. Wang, S. Slivken, D. H. Wu, M. Razeghi*

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

We report the demonstration of quantum cascade lasers (QCLs) with improved efficiency emitting at a wavelength of 4.9 ∼m 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-∼m-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.

Original languageEnglish (US)
Pages (from-to)17532-17538
Number of pages7
JournalOptics Express
Volume28
Issue number12
DOIs
StatePublished - Jun 8 2020

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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