Abstract
We develop a simple method leading to the determination of important parameters for the Praseodymium doped fluoride fiber amplifier (PDFFA), such as the non-radiative energy transfer upconversion coefficient or pump excited state absorption cross section. We apply this method to five ZBLAN bulks of different concentration and to a ZBLAN: Pr<SUP>3+</SUP> 500 ppmWt single-mode fiber. The resulting non-radiative energy transfer upconversion coefficients cT<SUB>1</SUB> are 5 s<SUP>-1</SUP> at 500 ppmWt and 9 s<SUP>-1</SUP> at 1000 ppmWt. When the pump wavelength is set at 1017 nm, (sigma) <SUB>ESAp</SUB> is very weak: less than 5.10<SUP>-26</SUP> cm<SUP>2</SUP>. We measure that the <SUP>3</SUP>P<SUB>0</SUB> population varies to the 2.7<SUP>th</SUP> pump power. We conclude that the upconversion mechanism leading to the excitation of <SUP>3</SUP>P<SUB>0-1</SUB>-<SUP>1</SUP>I<SUB>6</SUB> states in the PDFFA is different from all that has been previously suggested and we propose a three photon process. According to this study, a new model of the PDFFA is suggested.
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