Comments on "Selective enhancement of second and third-order nonlinear optical properties of newly synthesised trisglycine epsomite single crystal"

Abstract

The authors of the title paper (Materials Letters 223 (2018) 33–36) report to have newly synthesized trisglycine epsomite (TGE) single crystals by conventional solution growth method. In this comment, many points of criticism, concerning the crystal growth and experimental data of this so-called TGE crystal are discussed to prove that trisglycine epsomite is a dubious crystal.