Coherent coupling of ring cavity surface emitting quantum cascade lasers

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

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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
Issue number7
StatePublished - Aug 16 2010

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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