Highly transparent Tm:Ho:YAG transparent ceramics were prepared using advanced ceramic technology and their spectroscopic properties were studied for infrared laser applications. Following the Judd-Ofelt procedure several spectroscopic properties such as the radiative transition probability (Arad), radiative decay time (τrad) and fluorescence branching ratio (β) are quantitatively obtained from the absorption spectrum. The absorption and emission cross sections corresponding to the 5I7 → 5I8 transition of Ho3+ at 2.1 μm have been evaluated following Mc Cumber theory and found that the obtained emission spectrum very well correlates to the simulated emission spectral data. The optical gain spectrum spread from 1800 nm to 2150 nm with a spectral width of over 107 nm and maximum gain coefficient of 0.44 cm–1. Thus it is expected that the Tm3+:Ho3+:YAG ceramics would be an appropriate host material to achieve infrared laser applications at 2.1 μm.
Kumar, G. A. and Pokhrel, Madhab, "2.1μm Emission Spectral Properties of Tm and Ho Doped Transparent YAG Ceramic" (2012). Physics and Astronomy Faculty Publications and Presentations. 302.