Plano-Concave Cylindrical Lens is an optical plano-concave lens in columnar form, with negative focal lengths, diverging light in one dimension. Plano concave cylindrical lenses could be utilized for linear expansion of light output, circularization of elliptical diode laser spots, conversion of circular collimated beams into laser lines, one-dimensional image stretching, and other applications relevant to beam manipulation and output processing, such as anamorphic image shaping, laser scanning, diode lasers, optical metrologies, and spectroscopes, etc.