Single-mode quantum cascade lasers employing a candy-cane shaped monolithic coupled cavity

Peter Q. Liu, Kamil Sladek, Xiaojun Wang, Jen Yu Fan, Claire F. Gmachl

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

We demonstrate single-mode quantum cascade lasers emitting at ∼4.5 μm by employing a monolithic "candy-cane" shaped coupled-cavity consisting of a straight section connecting at one end to a spiral section. The fabrication process is identical to those for simple Fabry-Perot-type ridge lasers. Continuously tunable single-mode emission across ∼8 cm -1 with side mode suppression ratio up to ∼25 dB and a single-mode operating current range of more than 70% above the threshold current is achieved when the lasers are operated in pulsed-mode from 80 K to 155 K.

Original languageEnglish (US)
Article number241112
JournalApplied Physics Letters
Volume99
Issue number24
DOIs
StatePublished - Dec 12 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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