Analysis of the Features of Two-Photon-Excited Luminescence in Micropowders of Zinc Oxide and Zinc Selenide at High Optical Excitation Lewels

Abstract The spectra of two-photon-excited luminescence (TPEL) of zinc oxide and zinc selenide micropowders under pulsed-periodic emission of a copper vapour laser have been investigated. The mechanisms of formation of TPEL spectra of the studied materials have been revealed. It was found that at laser irradiation intensities of 107 W/cm2 the superluminescence effect is observed in zinc oxide and zinc selenide micropowders. This is confirmed by the increase of TPEL intensity with increasing intensity of excitation radiation. It was found that with increasing the intensity of excitation radiation in the studied samples a shift of the maximum of the TPEL spectrum band to 4-5 nm is observed. Keywords: two-photon-excited luminescence, zinc oxide, zinc selenide, micropowder, spectrum.