Role of Yb(3+) ions on enhanced ~2.9??m emission from Ho(3+) ions in low phonon oxide glass system.

ABSTRACT: The foremost limitation of an oxide based crystal or glass host to demonstrate mid- infrared emissions is its high phonon energy. It is very difficult to obtain radiative mid-infrared emissions from these hosts which normally relax non-radiatively between closely spaced energy levels of dopant rare earth ions. In this study, an intense mid-infrared emission around 2.9??m has been perceived from Ho(3+) ions in Yb(3+)/Ho(3+) co-doped oxide based tellurite glass system. This emission intensity has increased many folds upon Yb(3+): 985?nm excitation compared to direct Ho(3+) excitations due to efficient excited state resonant energy transfer through Yb(3+): (2)F5/2???Ho(3+): (5)I5 levels. The effective bandwidth (FWHM) and cross-section (?em) of measured emission at 2.9??m are assessed to be 180?nm and 9.1?×?10(-21)?cm(2) respectively which are comparable to other crystal/glass hosts and even better than ZBLAN fluoride glass host. Hence, this Ho(3+)/Yb(3+) co-doped oxide glass system has immense potential for the development of solid state mid-infrared laser sources operating at 2.9??m region.

SUBMITTER: Balaji S 

PROVIDER: S-EPMC4931574 | biostudies-literature | 2016 Jul

REPOSITORIES: biostudies-literature