Grating-coupled surface emitting quantum cascade ring lasers

  • Mujagić E
  • Schartner S
  • Hoffmann L
 et al. 
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We report on the fabrication and operation of quantum cascade ring lasers providing grating-coupled surface emission. The devices exhibit tunable far fields, ranging from spot- to ring-shaped symmetric beam cross sections, depending on the grating period. This—along with threshold current densities as low as for comparable Fabry–Pérot lasers—demonstrates the compatibility of reduced beam divergence and two-dimensional integrability, resulting in an attractive light source for applications in midinfrared spectroscopy and imaging.

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  • E. Mujagić

  • S. Schartner

  • L. K. Hoffmann

  • W. Schrenk

  • M. P. Semtsiv

  • M. Wienold

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