Absolute quantum efficiency of the luminescence of Cr3+ ions in gadolinium gallium and gadolinium scandium gallium garnet crystals

Measurements were made of the absolute quantum efficiency of the luminescence of Cr³⁺ ions due to transitions from the ⁴T₂ state in gadolinium gallium (GdGaG) and gadolinium scandium gallium (GdScGaG) garnet crystals. The quantum efficiency of the luminescence of the Cr³⁺ ions in the ⁴T₂ state in GdGaG and GdScGaG crystals was close to unity at least up to chromium ion concentrations of 3×10²⁰ cm^–3.