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International Conference Laser Optics (ICLO)

Stimulated Absorption in Holmium Fibers in the Wavelength Range of $1.5-1.75\ \mu \mathrm{m}$

Vladimir A. Kamynin, Alexey A. Wolf, Serafima A. Filatova, Irina V. Zhluktova, A. I. Fedoseev, Ivan A. Lobach, Sergei A Babin, В.Б. Цветков

Published Jun 20, 2022• 1 citation
Publisher

Abstract

We study the excited-state absorption for holmium-doped optical fibers in the spectral range of$1.5-1.75\ \mu \mathrm{m}$. The pump-induced absorption spectra and temporal transmission dynamics for fibers with different ion concentration and length are measured.

DOI
10.1109/iclo54117.2022.9839955

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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.
Absorption of continuous wave and pulsed resonance radiation at a wavelength of 1.6 µm at the upward transition from the excited state5I7^{5}{\mathrm{I}}_{7}5I7​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 transition5I7→5I5^{5}{\mathrm{I}}_{7}{ \to }^{5}{\mathrm{I}}_{5}5I7​→5I5​as 1.9×10–21cm2. It allowed us to correctly simulate the relaxation process of the5I7^{5}{\mathrm{I}}_{7}5I7​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 the5I8→5I7^{5}{\mathrm{I}}_{8}{ \to }^{5}{\mathrm{I}}_{7}5I8​→5I7​transition in Ho-doped fibers.
Erbium-Doped Fiber Amplifiers (EDFAs) can very efficiently convert pump to signal energy. Quantum efficiencies higher than 80 % with 1.48 pm pump [1], and 93% when pumped at 980 nm [2] are reported. However, even higher values should be theoretically possible for an ideal EDFA. Various physical effects may lead to quantum efficiency (QE) reduction. Not all of them are quite well understood yet. At Erbium concentrations above 100 ppm by weight the pump loss is partly explained by energy transfer between two excited ions resulting in upcon- version process [3]. At low concentrations Excited-State Absorption (ESA) could be a more significant effect reducing QE. ESA of photons from 1.5 |im band have been predicted from absorption measurements [4] and also observed [5]. However, to our knowledge, no quantitative analysis has been made which would distinguish between the contributions of ESA and two-particle upconversion when measurements of short wavelength luminescence were performed.
We quantify the refractive index changes (RIC) in single-mode ytterbium-doped optical fibers induced by optical pulses at 980 nm and, for the first time, report details of the effect dynamics. The RIC dynamics is shown to follow that of the population of the excited/unexcited ion states with a factor proportional to their polarizability difference (PD). The absolute PD value is evaluated in the spectral range of 1460-1620 nm for different fiber samples and is found to be independent on the fiber geometry and on the ion concentration. The PD dispersion profile indicates to a predominant far-resonance UV rather than near-resonant IR transitions contribution to the RIC.