Comments on the paper "L-Lysine doped oxalic acid single crystals - A potential phase matchable organic material for optical limiting applications"

Abstract

The authors of the title paper (Optics and Laser Technology 107 (2018) 478-483) report to have grown a so-called 'l-Lysine doped oxalic acid' crystal by slow evaporation of an aqueous solution containing l-lysine and oxalic acid in 1:2 mol ratio. In this letter to the Editor, we prove that the 'l-lysine doped oxalic acid' is a dubious crystal.