Luminescence and lasing in ZnO and ZnSe micropowders under laser excitation

Abstract

Relevance: is that the mechanisms of photoluminescence spectra formation in ZnO and ZnSe micropowders under pulsed-periodic laser excitation have not been sufficiently investigated at present.

The aim: is to elucidate the mechanisms of formation of photoluminescence spectra in ZnO and ZnSe micropowders under pulsed-periodic laser excitation.

Methods: a modern method of laser spectroscopy, developed by the authors, based on a compact copper vapour laser, operating in pulse-periodic mode, was used in this work.

Results: photoluminescence (PL) spectra of zinc oxide and zinc selenide micropowders under pulsed-periodic emission of copper vapour laser have been investigated. The mechanisms of formation of the PL spectra of the studied samples have been revealed. It is found that at intensities of 10⁶ W/cm² of laser radiation in zinc oxide and zinc selenide micropowders the superluminescence effect is observed. It was found that at increasing intensities of excitation radiation in the studied samples a shift of the maximum of the PL spectrum band up to 4 nm is observed.