High-power spiral cavity quantum cascade superluminescent emitters with a passive loop back facet

Mei C. Zheng, Yezhezi M. Zhang, Peter Q. Liu, Xiaojun Wang, Jen Yu Fan, Mariano Troccoli, Claire F. Gmachl

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

We report on the experimental demonstration of a high-power (>100mW) quantum cascade superluminescent (SL) emitter employing a spiral cavity with a passive loop back facet. By replacing the rounded, wet-etched, antireflection coated back facet of a spiral cavity with a passive loop facet, the lasing action was suppressed (i.e., threshold current density increased) due to a decrease in the back facet reflectivity. This type of facet allowed us to achieve a twofold increase in the peak SL power by employing a 16-mm-long spiral cavity.

Original languageEnglish (US)
Article number011001
JournalOptical Engineering
Volume57
Issue number1
DOIs
StatePublished - Jan 1 2018

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)

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