Nonlinear transmission coefficient of ytterbium-holmium fiber at the wavelength 978 nm |
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Authors: | A. V. Kir’yanov Yu. O. Barmenkov V. P. Minkovich M. V. Andres |
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Affiliation: | (1) Centro de Investigaciones en Optica, Loma del Bosque, 115, Col. Lomas del Campestre, Leon 37150 Gto., Mexico;(2) Departamento de Fisica Aplicada—ICMUV, Universidad de Valencia, Dr. Moliner 50, E46100 Burjassot, Spain |
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Abstract: | An experimental and theoretical investigation of the nonlinear transmission coefficient of ytterbium-holmium codoped silica fiber (YHF) at continuous-wave 978-nm pumping is reported. An analysis of the fiber absorption and luminescence spectra under 978-nm pumping reveals a variety of processes participating in the mixed (Yb3+, Ho3+) system: the energy transfer Yb3+ → Ho3+, the up-conversion and excited-state absorption in Ho3+, and the luminescence quenching due to the presence of Yb3+-Yb3+ ion pairs. These processes are shown to notably affect the transmission coefficient of YHF, which is reflected in a pronounced modification of its dependences on pump power, fiber length, and dopant concentrations, in comparison with the case of purely ytterbium-doped fiber (YF). A modeling of the experimentally measured dependences of the YHF transmission coefficient on pump power and fiber length allows us to obtain the coefficients addressing the energy transfer process Yb3+ → Ho3+ in YHF. A comparison of YHF and YF at the same pumping conditions reveals that, in YHF, a considerable part of the pump power absorbed in the Yb3+ subsystem is transferred into the Ho3+ subsystem; this results in an effective population of its 5 I 7 state and makes YHF promising for 2-μm lasing and amplifying. |
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