UV laser induced second order optical effects in the \(\hbox {Tl}_{4}\hbox {PbTe}_{3}, \hbox {Tl}_{4} \hbox {SnSe}_{3}\) and \(\hbox {Tl}_{4} \hbox {PbSe}_{3}\) single crystals
In this work, following the crystallochemical analysis and electronic structural parameters of \(\hbox {Tl}_{4}\hbox {PbTe}_{3}, \hbox {Tl}_{4}\hbox {SnSe}_{3 }\) and \(\hbox {Tl}_{4}\hbox {PbSe}_{3 }\) single crystals, we predicted and experimentally demonstrated the second harmonic generation (SHG) and electrooptics effects for them. Photoinduced changes were performed by using the 7ns UV nitrogen laser at wavelength 337nm. The parameters of the SHG were determined through probing in to the reflected regime at wavelength of the 532nm. The dependence of the output SHG versus photoinducing power density is studied. Explanation of the observed effect is given within a framework of the quantum chemical DFT simulations.
electrooptical effect dft simulations optoelectronic materials