Optical and magneto-optical spectra of europium-doped strontium tetraborate single crystals

Optical absorption, luminescence, magnetic circular dichroism and Faraday rotation spectra of Sr0.95Eu0.05B4O7 single crystals are studied. The crystal field parameter for europium ions is found to be equal to 790 cm−1. Excitation spectrum of luminescence strongly differs from that of low-doped polycrystalline strontium tetraborate. The Verdet constant in the ultraviolet is comparable to that of terbium gallium garnet in the visible.