We present methods for beam modifications of ring quantum cascade lasers emitting around λ = 9μm, which are based on novel distributed feedback grating designs. This includes the creation of a rotationally symmetric far field with a central intensity maximum using an off-center grating as well as the generation of partial radially polarized emission beams induced by a rotation of the grating slits.
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| http://dx.doi.org/10.1364/OE.22.015829 | DOI Listing |
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