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^–21 cm². 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 1 μs 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.

Excited-state absorption and ion pairs as sources of nonlinear losses in heavily doped Erbium silica fiber and Erbium fiber laser

Alexander V. Kir’yanov, Yury O. Barmenkov, and Nikolay N. Il’ichev
Opt. Express 13(21) 8498-8507 (2005)

Positive influence of Ce³⁺ on effective transfer Yb³⁺:²F_5/2 → Ho³⁺:⁵I₆ in silica-germanate glass for mid-infrared applications

Tao Wang, Feifei Huang, Wenqian Cao, Yanyan Guo, Ruoshan Lei, Renguang Ye, Junjie Zhang, and Shiqing Xu
Opt. Mater. Express 7(3) 1084-1095 (2017)

Emission of 1.38 μm and gain properties from Ho³⁺-doped low-phonon-energy gallate bismuth lead oxide glasses for fiber-optic amplifiers

Bo Zhou, Hai Lin, Dianlai Yang, and Edwin Yue-Bun Pun
Opt. Lett. 35(2) 211-213 (2010)

Investigation of signal excited-state absorption in bismuth-based erbium-doped fiber amplifier

Jae Hyun Shin and Ju Han Lee
J. Opt. Soc. Am. B 27(7) 1452-1457 (2010)

Numerical simulation and experiment on generation dynamics of a Ho³⁺-doped fiber laser with an intracavity Mach–Zehnder modulator

Anatolii I. Fedoseev, Serafima A. Filatova, Vladimir A. Kamynin, Mariya S. Kopyeva, Oleg E. Nanii, Alexander P. Smirnov, and Vladimir B. Tsvetkov
J. Opt. Soc. Am. B 38(1) 256-262 (2021)