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Thematische Bibliographien / Thulium and homium ions

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Auswahl der wissenschaftlichen Literatur zum Thema „Thulium and homium ions“

Autor: Grafiati

Veröffentlicht am 21. Dezember 2024

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Zeitschriftenartikel zum Thema "Thulium and homium ions"

1

Cajzl, Jakub, Pavel Peterka, Maciej Kowalczyk, et al. "Thulium-Doped Silica Fibers with Enhanced Fluorescence Lifetime and Their Application in Ultrafast Fiber Lasers." Fibers 6, no. 3 (2018): 66. http://dx.doi.org/10.3390/fib6030066.

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In this work we report on the thulium-doped silica-based optical fibers with increased fluorescence lifetime of the 3F4 level thanks to the modification of the local environment of thulium ions by high content of alumina. The determination of the cross-relaxation energy-transfer coefficients from the measurements of the fluorescence lifetimes of the 3F4 and 3H4 energy levels of Tm3+ ions in the experimentally prepared optical fiber is provided as well. Preforms of optical fibers were prepared either by conventional solution-doping of Tm3+ and Al3+ ions or by dispersion-doping of Tm3+ ions with alumina nanoparticles. Optical fibers were characterized by means of Tm, Al, and Ge concentrations, refractive index profiles, optical spectral absorption and luminescence, and by time-resolved fluorescence spectroscopy. Highly aluminium-codoped thulium silicate optical fibers exhibited fluorescence lifetimes of over ~500 μs with maximum value of 756 μs, which means a fluorescence lifetime enhancement when compared to the thulium-doped fibers reported elsewhere. We show an application of the thulium-doped fiber in a compact all-fiber ring laser that is passively mode-locked by using graphene-based saturable absorber. The output pulsewidth and repetition rate were 905 fs and 32.67 MHz, respectively.

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2

Larsen, C. C., J. Jensen, A. R. Mackintosh, and B. J. Beaudry. "SPIN DYNAMICS OF THULIUM IONS IN TERBIUM." Le Journal de Physique Colloques 49, no. C8 (1988): C8–331—C8–332. http://dx.doi.org/10.1051/jphyscol:19888147.

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3

Zamani, Hassan Ali, Fatemeh Naghavi-Reyabbi, Majid Mohammadhosseini, et al. "Quantitative Monitoring of Thulium Ions by a New Thulium Selective Polymeric Membrane Sensor." Sensor Letters 10, no. 1 (2012): 112–16. http://dx.doi.org/10.1166/sl.2012.2323.

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4

Chen, Sitong, and Zhaofeng Zhang. "Design of the 1650-1700nm U band doped fiber laser." Highlights in Science, Engineering and Technology 97 (May 28, 2024): 197–206. http://dx.doi.org/10.54097/2a2q0968.

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Increasing the power of thulium-doped fiber lasers is an important direction for the future development of fiber lasers. Thulium ions exhibit excellent optical properties in the U-band, making them valuable for research. This paper has established a modular design process for fiber lasers, investigating the energy level system of Thulium ions, electron transition processes, power propagation equations, pump power threshold, laser output power, and Bragg grating reflectance for specific wavelength photons. The reflectance of the front and rear cavity mirrors and Bragg grating was also redesigned. Finally, by establishing a physical model and employing numerical simulations, the relationship between laser onset power and pump light input power was determined: when the pump light input power reaches 10.1W, a population inversion occurs, and the fiber laser begins to generate laser output power. The laser output power linearly increases with the increase in pump light input power. When the pump light input power reaches 100W, the laser output power reaches its maximum value of 14.17W. This provides valuable data support for the laboratory preparation of 1650-1700nm thulium-doped fiber lasers.

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5

Kharkov, A. M., M. N. Sitnikov, V. V. Kretinin, O. B. Fisenko, and G. Yu Fillipson. "Magnetocapacity of manganese sulphides substituted by thulium ions." IOP Conference Series: Materials Science and Engineering 822 (May 22, 2020): 012024. http://dx.doi.org/10.1088/1757-899x/822/1/012024.

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6

Gusakova, Natali V., Maxim P. Demesh, Anatol S. Yasukevich, Anatoliy A. Pavlyuk, and Nikolay V. Kuleshov. "Mechanisms of the energy transfer between thulium ions in tungstate and molybdate crystals." Journal of the Belarusian State University. Physics, no. 1 (February 11, 2021): 33–40. http://dx.doi.org/10.33581/2520-2243-2021-1-33-40.

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In this work, we investigated mechanisms of the energy transfer in Tm : KY(WO4)2, Tm : KLu(WO4)2 and Tm:NaBi(MoO4)2 crystals. Room-temperature absorption and emission spectra were used to determine microparameters of energy migration among thulium ions in the 3H4 and 3F4 excited states in the frames of Förster – Dexter theory. Parameters of cross-relaxation 3H4 + 3H6 → 3F4 + 3F4 and energy migration were obtained via analysis of luminescence decay 3H4 → 3F4 with a hopping model. The parameters describing excitation migration between thulium ions in 3H4 state obtained by two methods were in good agreement. It has been shown that the dipole-dipole mechanism of interaction is responsible for the efficient cross-relaxation process in the crystals under study. The results indicate that the energy migration between 3H4 enhances the cross-relaxation at thulium content more than ∼1.3–1.5 at. % in these laser materials. The obtained values of the migration parameters CDD exceed the values of the cross-relaxation parameters CDA, and the energy transfer in these materials can be described with the hopping model. An efficient cross-relaxation process leads to the relatively high efficiencies of the systems based on these crystals under pumping at 0.8 µm. The dominant process of energy migration between thulium ions in 3F4 excited state makes tungstate and molybdate crystals good candidates for the Ho3+ co-activation for laser generation at 2.1 µm. Parameters obtained in this study can be used for mathematical modeling of laser characteristics.

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7

Guillemot, Lauren, Pavel Loiko, Alain Braud, Thomas Godin, Ammar Hideur, and Patrice Camy. "Les lasers thulium à 2300 NM : Avancées et perspectives." Photoniques, no. 109 (July 2021): 35–39. http://dx.doi.org/10.1051/photon/202110935.

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Cet article dresse un état des lieux des dernières avancées dans le domaine des lasers dopés aux ions thulium émettant dans le proche infrarouge autour de 2.3 μm. Il présente les verrous liés à l’oscillation laser de l’ion thulium sur la transition 3H4 → 3H5 et les solutions prometteuses envisagees pour les contourner en s’appuyant notamment sur un mécanisme de pompage par upconversion particulièrement efficace dans certains matériaux.

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8

Li, Juncen. "Design and Optimisation of S-band fibre optic amplifier." Highlights in Science, Engineering and Technology 72 (December 15, 2023): 205–9. http://dx.doi.org/10.54097/1vkzq689.

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S-TDFA (S-band thulium-doped fibre amplifier) is a device that uses thulium-doped fibre to achieve the enhancement of optical signals in the S-band (1450-1530 nm), which is of great significance in long-distance optical communication systems, providing high gain, low noise and a wide range of wavelengths. Nowadays, thulium-doped fibre amplifier is one of the research hotspots of fibre-optic communication devices, and how to obtain high signal gain is also of great significance and value.In this paper, based on the energy level structure of thulium ion, the electron jump process, and the characteristics of tellurite glass medium, two physical models, namely, the rate equation of thulium ion's three energy level structure and the power propagation equation, are established.Under the power of 793 nm pump light, 1470 nm signal light and 200 mW pump light, the maximum signal gain of thulium-doped tellurite is 48 dB when the length of the optical fibre is 1.42 m and the thulium-doped ion concentration is ions per square metre, combined with the numerical solution in MATLAB and optimized peak value using a genetic algorithm.

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9

Louot, Christophe, Félix Sanson, Arnaud Motard, et al. "Emission Wavelength Limits of a Continuous-Wave Thulium-Doped Fiber Laser Source Operating at 1.94 µm, 2.09 µm or 2.12 µm." Photonics 11, no. 3 (2024): 246. http://dx.doi.org/10.3390/photonics11030246.

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We present a thulium-doped single-oscillator monolithic fiber laser emitting successively at three wavelengths, especially at unusual long wavelengths as 2.09 µm and even at 2.12 µm. The 793 nm core absorption of 8.42 dB/m allows for achieving a slope efficiency higher than 43% both at 1.94 µm and 2.09 µm. The operation of the laser at 1.94 µm, 2.09 µm, and 2.12 µm is compared by using different fiber Bragg gratings to push the limit of thulium ions emission above 2.05 µm. This is the first demonstration of emission exceeding wavelengths of 2.1 µm of an only thulium-doped fiber laser, to the best of our knowledge.

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10

Schornig, Carla, Marius Stef, Gabriel Buse, Maria Poienar, Philippe Veber, and Daniel Vizman. "Spectroscopic Properties of TmF3-Doped CaF2 Crystals." Materials 17, no. 20 (2024): 4965. http://dx.doi.org/10.3390/ma17204965.

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In this study, we report the growth and comprehensive spectroscopic analysis of TmF3-doped CaF2 crystals, grown using the vertical Bridgman method. The optical absorption and photoluminescence properties of both trivalent (Tm3+) and divalent (Tm2+) thulium ions were investigated. Optical absorption spectra in the UV-VIS-NIR range reveal characteristic transitions of Tm3+ ions, as well as weaker absorption bands corresponding to Tm2+ ions. The Judd–Ofelt (JO) formalism was applied to determine the intensity parameters Ω2, Ω4, and Ω6, which were used to calculate radiative transition probabilities, branching ratios, and radiative lifetimes for the Tm3+ ions. The emission spectra showed concentration-dependent quenching effects, with significant emissions observed for the concentration of 0.1 mol% TmF3 under excitation at 260 nm and 353 nm for Tm3+ ions and at 305 nm for Tm2+ ions. A new UV emission associated with divalent Thulium is reported. The results indicate that higher TmF3 concentrations lead to increased non-radiative energy transfer, which reduces luminescence efficiency. These findings contribute to the understanding of the optical behavior of Tm-doped fluoride crystals, with implications for their application in laser technologies and radiation dosimetry.

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