High Er concentration phosphate glasses for planar waveguide amplifiers

Seppo Honkanen; Tomoko Ohtsuki; Shibin Jiang; S. Iraj Najafi; Nasser Peyghambarian

doi:10.1117/12.271162

2 May 1997 High Er concentration phosphate glasses for planar waveguide amplifiers

Seppo Honkanen, Tomoko Ohtsuki, Shibin Jiang, S. Iraj Najafi, Nasser Peyghambarian

Proceedings Volume 2996, Rare-Earth-Doped Devices; (1997) https://doi.org/10.1117/12.271162
Event: Photonics West '97, 1997, San Jose, CA, United States

Abstract

Cooperative upconversion processes and Yb-Er energy transfer efficiencies in high Er concentration phosphate glasses were studied. The cooperative upconversion coefficients were deduced from the pump intensity dependence of luminescence decay curves. Cooperative upconversion coefficients of ⁴I_13/2 level, for Er³⁺ concentrations higher than 1 X 10²⁰ cm^-3, are one order of magnitude smaller than the ones reported for silica glass. The increase in the cooperative upconversion coefficient with the increase in Er³⁺ concentration was found to be small and Er³⁺ concentrations as high as 3.7 X 10²⁰ cm³⁺ in this glass are feasible. Yb-Er energy transfer efficiency in Yb/Er co-doped phosphate glasses, with Er concentrations as high as 1.9 X 10²⁰ cm^-3 and 2.4 X 10²⁰ cm^-3, were measured with a pump and probe technique and also estimated from lifetime measurements. The energy transfer efficiencies exceed 95 percent, although the ratio of the concentrations, Yb/Er, is only about 1.2 and 2 in the samples studied.This confirms that efficient pumping of high Er³⁺ concentration phosphate glass, required in waveguide amplifiers, can be achieved utilizing Yb/Er co-doping.

Citation Download Citation

Seppo Honkanen, Tomoko Ohtsuki, Shibin Jiang, S. Iraj Najafi, and Nasser Peyghambarian "High Er concentration phosphate glasses for planar waveguide amplifiers", Proc. SPIE 2996, Rare-Earth-Doped Devices, (2 May 1997); https://doi.org/10.1117/12.271162

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