Emission of λ≈2 μ stimulated radiation by holmium in aluminum holmium garnet crystals
Stimulated emission was obtained from Ho3+ ions (5I7→5I8 transition) in a new single-component self-activated system with aluminum holmium garnet crystals grown by the Czochralski method. The thresholds of the λ= 2.129 and 2.122 laser emission at 90 °K were 9 and 14 J/cm, respectively. The absorption and luminescence spectra were used in the derivation of the Stark splitting scheme of the 5I7 and 5I8 terms. The lifetime of the 5I7 term was determined (τ≈10 msec).