EPR method for investigation and diagnosis materials promising for quantum electronics (PbGa 2 S 4 , ZnSe)

Electron paramagnetic resonance (EPR) spectra of rare-earth Dy3+ and Ce3+ ions in lead thiogallate PbGa2S4 single crystals were discovered and investigated. EPR spectra were studied in X-band in the temperature range 4–30 K. Parameters of spin Hamiltonian of EPR spectra of Dy3+ and Ce3+ ions in PbGa2S4 single crystals were calculated. It was set that dysprosium and cerium ions replace lead ions in crystal lattice. Also we carried out a diagnosis of ZnSe crystals doped with different rare-earth and transition metal ions. It was shown that due to diffusion of transition elements of Cr3+, Co2+ or Fe3+ along with the working admixture in the diffusion layer the EPR spectra of related admixtures are detected. The EPR diagnosis of these admixtures can be used in the development of modes, allowing minimizing the concentration of related admixtures, worsening the performance of laser materials. It was found that diffusion of Cr, Co and Fe transition metal ions leads to admixture of Mn ions. The EPR signals of Mn and Co are proposed as the ideal markers to control the crystal structure of the diffusion active layer.