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Journal of Lightwave Technology

Investigation of Absorption Dynamics From the Excited State 5I7 of Holmium Ions in Optical Silica-Based Fibers

Serafima A. Filatova, Alisa E. Fale, Vladimir A. Kamynin, Alexey A. Wolf, Irina V. Zhluktova, О. Е. Наний, A. P. Smirnov, Sergey A. Babin, Anatolii I. Fedoseev, В.Б. Цветков

Published May 22, 2023• 6 citations
Publisher

Abstract

Absorption of continuous wave and pulsed resonance radiation at a wavelength of 1.6 µm at the upward transition from the excited state$^{5}{\mathrm{I}}_{7}$of holmium (Ho3+) ions in silica-based fiber has been studied. Analysis of experimental and simulated data of the absorption dynamics for the case of pulsed pumping of Ho-doped fiber allowed us to determine the previously unknown value of the absorption cross-section at the transition$^{5}{\mathrm{I}}_{7}{ \to }^{5}{\mathrm{I}}_{5}$as 1.9×10–21cm2. It allowed us to correctly simulate the relaxation process of the$^{5}{\mathrm{I}}_{7}$level population averaged over the fiber length in the presence of stationary resonance radiation. The effect of pulsed resonance radiation with different peak powers (10 and 100 W) and pulse duration of 1μs on the stationary active medium was considered. The mutual influence of the Ho-doped fiber characteristics and the resonance radiation at a wavelength of 1.6 μm was found. This allows the resonance radiation to be used as an attenuator or modulator of laser radiation at the$^{5}{\mathrm{I}}_{8}{ \to }^{5}{\mathrm{I}}_{7}$transition in Ho-doped fibers.

DOI
10.1109/jlt.2023.3278534

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Stimulated Absorption in Holmium Fibers in the Wavelength Range of 1.5−1.75 μm1.5-1.75\ \mu \mathrm{m}1.5−1.75 μm
We study the excited-state absorption for holmium-doped optical fibers in the spectral range of1.5−1.75 μm1.5-1.75\ \mu \mathrm{m}1.5−1.75 μm. The pump-induced absorption spectra and temporal transmission dynamics for fibers with different ion concentration and length are measured.
We report a study of the excited-state absorption (ESA) in erbium-doped silica fiber (EDF) pumped at 977 nm, when the fiber is simultaneously excited by signal radiation at 1531 nm. We show, both experimentally and theoretically, that ESA efficiency at 977 nm gets strongly enhanced only in the presence of signal power. Experimentally, this conclusion is supported through the detection of upconversion emission, a “fingerprint” of the ESA process, and through the measurements of the EDF nonlinear transmission coefficient for the pump wavelength, which is sensitive to the ESA value. It is shown that the experimental data are precisely modeled with an advanced five-level Er3+ model developed for the EDF.
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