title: Grating-based far field modifications of ring quantum cascade lasers.
abstract: 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.
authors: Rolf
authors: R
authors: Szedlak
authors: Clemens
authors: C
authors: Schwarzer
authors: Tobias
authors: T
authors: Zederbauer
authors: Hermann
authors: H
authors: Detz
authors: Aaron Maxwell
authors: AM
authors: Andrews
authors: Werner
authors: W
authors: Schrenk
authors: Gottfried
authors: G
authors: Strasser