Optimizing facet coating of quantum cascade lasers for low power consumption

Y. Bai, S. R. Darvish, N. Bandyopadhyay, S. Slivken, M. Razeghi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Typical high power consumption (∼10 W) of mid-infrared quantum cascade lasers (QCLs) has been a serious limitation for applications in battery powered systems. A partial high-reflection (PHR) coating technique is introduced for power downscaling with shorter cavity lengths. The PHR coating consists of a double layer dielectric of SiO2 and Ge. With this technique, a 4.6 μm QCL with an ultra low threshold power consumption of less than a watt (0.83 W) is demonstrated in room temperature continuous wave operation. At 25°C, the maximum output power and wall plug efficiency are 192 mW and 8.6, respectively.

Original languageEnglish (US)
Article number053103
JournalJournal of Applied Physics
Issue number5
StatePublished - Mar 1 2011

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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