Single-mode quantum cascade lasers based on a folded Fabry-Perot cavity

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

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21 Scopus citations


We demonstrate single-mode quantum cascade lasers employing a folded Fabry-Perot cavity consisting of two straight sections connected by a semicircular section in a "hairpin" shape. These folded cavity lasers emitting at ∼4.5 μm are fabricated with identical processes as those for plain Fabry-Perot ridge lasers, and show a strong suppression of the comb of Fabry-Perot cavity modes, leading to tunable single-mode emission with up to 27 dB side mode suppression ratio and a single-mode operating current range of up to 60% above the threshold current when operated in pulsed mode; single-mode emission is achieved from 80 to ∼240 K.

Original languageEnglish (US)
Article number061110
JournalApplied Physics Letters
Issue number6
StatePublished - Feb 7 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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