Coherent coupling of ring cavity surface emitting quantum cascade lasers

Clemens Schwarzer, Elvis Mujagić, Yu Yao, Werner Schrenk, Jianxin Chen, Claire Gmachl, Gottfried Strasser

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

We present investigations on coherent coupling of surface emitting quantum cascade lasers (QCLs). For this purpose, the evanescent field coupling method is exploited under incorporation of a ring cavity surface emitting QCL pair with an emission wavelength of ≈8 μm. A series of these pairs with intercavity separations of 1 and 3 μm was fabricated. The coupling gap of 1 μm yields robust phase-locked light source pairs with coherent emission at all injection currents and a corresponding threshold current density of 2.65 kA/cm2 at room-temperature.

Original languageEnglish (US)
Article number071103
JournalApplied Physics Letters
Volume97
Issue number7
DOIs
StatePublished - Aug 16 2010
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Schwarzer, C., Mujagić, E., Yao, Y., Schrenk, W., Chen, J., Gmachl, C., & Strasser, G. (2010). Coherent coupling of ring cavity surface emitting quantum cascade lasers. Applied Physics Letters, 97(7), [071103]. https://doi.org/10.1063/1.3479913