Abstract
A laser-quality anisotropic ${\rm ZnS}{:}{{\rm Cr}^{2 +}}$ element was obtained using prolonged hot isostatic pressing at high temperature. Lasing centered at a wavelength of 2.45 µm was obtained with longitudinal pumping at a wavelength of 1.94 µm. The short-cavity laser slope efficiency with respect to the absorbed power was about 78%. The lasing wavelength was continuously tuned in the range of 2.35–2.52 µm by rotating the Brewster active element around the normal to its surface.
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