Current work reports comparative laser characterization of Cr:ZnS/Se polycrystalline gain media in non-selective Fabry-Perot and twisted mode cavities. It was demonstrated that the spectral output of lasers based on polycrystalline Cr:ZnS/Se in non-selective Fabry-Perot cavities is broadened to ~20-50 nm due to spatial hole burning in the gain elements. Mitigating the spatial hole burning in the same cavities via “mode twisting” results in narrow-line oscillation with linewidth narrowing to ~80-90 pm. Switching between broadened and narrow line oscillations was demonstrated by adjusting the orientation of intracavity waveplates with respect to the Brewster facilitated polarization.
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