Cylindrical lenses with negative focal length expand beam along one coordinate. Typical application for the lenses is beam shaping. Round laser beam can be focused into a line-spot with help of the lens. Anamorphic shape of the image/beam can be realized by using pair of cylindrical lenses, which makes it irreplaceable tool for circularization of diode laser output beams.
BK7, FS, UVFS, CaF2, ZnSe, Sapphire, Si
<3 arc min