Comments on the paper Growth and Characterization of Pure and Thiourea-Doped L-Alanine Single Crystals for NLO Devices

TL;DR

This paper critically examines previously claimed growth and characterization of certain crystals for NLO devices, questioning the authenticity of the reported pure and doped crystals.

Contribution

It provides a critical analysis challenging the validity of earlier reported crystal growth and characterization results.

Findings

Previous crystals are deemed dubious and possibly misrepresented.

Questions raised about the authenticity of the claimed crystal structures.

Implications for the reliability of prior research in this area.

Abstract

we show that the pure and thiourea-doped glycyl-L-alanine hydrochloride (GLAH and TU-GLAH) crystals claimed to have been grown by the authors of the title paper (Journal of Russian Laser Research, 34, 346-350 (2013)) are dubious crystals.