Abstract
codoped lanthanum aluminum germanate glasses are prepared by a simple melt-quenching method. The emission characteristic and energy transfer from to upon excitation of a conventional laser diode is investigated. The spectroscopic properties are estimated by using Judd–Ofelt parameters, branching ratios, and lifetimes. The microscopic energy transfer parameters of each process are also calculated. The large energy transfer coefficient of to and the little back energy transfer from to indicate that an efficient energy transfer process occurs.
© 2010 Optical Society of America
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