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Grating-coupled surface emitting quantum cascade ring lasers
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DOI：10.1063/1.2958910.png)
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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-Perot lasers-dernonstrates the compatibility of reduced beam divergence and two-dimensional integrability, resulting in an attractive light source for applications in midinfrared spectroscopy and imaging. (c) 2008 American Institute of Physics.
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