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Spectroscopic Properties of Yb^{3+}/Tb^{3+} Doped Germanate Glasses

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Kochanowicz M., Dorosz D., Żmojda J., Dorosz J.
Acta Physica Polonica A
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2012
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vol. 122
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issue 5
837-840
EN
In the article the cooperative energy transfer in GeO₂-GaO-BaO glass system doped with Yb^{3+}/Tb^{3+} under 980 nm laser diode excitation was investigated. The influence of Tb^{3+} concentration on the luminescent properties was determined. Measured strong luminescence at 489, 543, 586, 621 corresponds to ⁵D₄ → ⁷F_{J} (J = 6, 4, 3) transitions and luminescence at 381, 415, 435 nm results from ⁵D₃, ⁵G₆ → ⁷F_{J} (J = 6, 5, 4) transitions. Mechanism and energy diagram involved in observed emission were discussed. The highest upconversion emission intensity was obtained in the germanate glass doped with 0.7Yb₂O₃/0.7Tb₂O₃.
2
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Tm^{3+}/Ho^{3+}-Doped ASE Fibre Source for Mid-Infrared Sensor Applications

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Dorosz D., Żmojda J., Kochanowicz M., Miluski P., Dorosz J.
Acta Physica Polonica A
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2012
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vol. 122
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issue 5
927-932
EN
The infrared emission of Tm^{3+}/Ho^{3+}-doped antimony-silicate optical fiber has been presented. Luminescence at 2.1 μm corresponding to ⁵I₇ → ⁵I₈ transition in holmium was obtained by energy transfer between Tm^{3+} and Ho^{3+} ions. According to the Förster-Dexter theory, the efficiency of energy transfer of the ³F_4 (Tm^{3+}) → ⁵I₇ (Ho^{3+}) transition was calculated. The optimization of the activator content and the donor (Tm^{3+})/acceptor (Ho^{3+}) ions concentration ratio were conducted with the purpose of maximizing the efficiency of energy transfer. It made possible to select best-suited glass which was used to manufacture double-clad optical fiber. Strong and narrow bands of amplified spontaneous emission which formed as a result of energy transfer between thulium and holmium ions were observed in the fiber under exciting with radiation at 795 nm wavelength.
3
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Upconversion Luminescence in Yb^{3+}/Tm^{3+} Doped Double Clad Optical Fibre

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Zmojda J., Dorosz D., Kochanowicz M., Dorosz J.
Acta Physica Polonica A
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2011
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vol. 120
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issue 4
776-781
EN
The paper presents luminescence properties of telluride glass doped with Yb^{3+}/Tm^{3+} ions. Strong blue emission at 477 nm corresponding to the transition ^1 G_4 → ^3 H_6 in thulium ions was measured under the excitation of a 976 nm diode laser. The dependence of the upconversion emission upon the thulium ions concentration was studied in order to determine the optimal ion content. The results showed that intensity of upconversion emission enhances, with the increase of Tm^{3+} content up to 0.1 mol.%. The most effective energy transfer Yb^{3+} → Tm^{3+} occurs in the glassy matrix with molar ratio of dopant 1 Yb^{3+} : 0.1 Tm^{3+}. Double-clad optical fibre was made of glass with the highest upconversion intensity at the wavelength of λ = 477 nm (TGPF101). As a result of optical excitation (λ = 976 nm) of the produced optical fibre, an additional emission line, which was not noticed in the glass, was observed at the wavelength of 351 nm corresponding to the ^1 D_2 → ^3 H_6 transition.
4
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White Upconversion in Yb^{3+}/Tm^{3+}/Ho^{3+} Co-Doped Antimony-Germanate Glasses

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Żmojda J., Dorosz D., Kochanowicz M., Miluski P., Dorosz J.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
598-601
EN
In the paper the spectroscopic properties of antimony-germanate glass co-doped with $Yb^{3+}/Ho^{3+}$ has been investigated. Fabricated $Yb^{3+}/Tm^{3+}/Ho^{3+}$ co-doped glass is characterised by the emission of simultaneous multicolour upconversion luminescence. Strong blue $^{1}G_{4} → ^{3}H_{6}(Tm^{3+})$, green $^{5}F_{4} → ^{5}I_{8}(Ho^{3+})$ and red $^{5}F_{5} → ^{5}I_{8}(Ho^{3+})$ upconversion emission bands have been measured under 976 nm excitation at room temperature. Influence of molar ratio of active ions and excitation power on the colour coordinates (CIE-1931) have been investigated.
5
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Multicore Optical Fibres for an External Talbot Cavity

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Dorosz D., Kochanowicz M., Dorosz J.
Acta Physica Polonica A
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2009
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vol. 116
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issue 3
298-301
EN
In the paper the application of multicore optical fibres in phased-locked high power lasers is presented. The manufacturing and properties of multicore active optical fibres were presented. The thermally stable aluminosilicate glass doped with Nd^{3+} (0.5 mol%) ions were melted and used as cores in manufactured multicore optical fibres. Two configurations of double clad multicore optical fibres with the circular array containing 15 and 30 Nd^{3+} doped cores on ring inside a large pump clad were realized. Absorption and luminescence spectra of obtained glasses and fibres were presented. An external plane mirror located at certain distance of the array forms the basic Talbot cavity. The possibilities of mode selection and phase-locking by using Talbot resonator applied to fabricated multicore fibres were investigated.
6
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Nd^{3+}/Yb^{3+} Doped Phosphate and Antimony Glasses for Optical Fibre Source

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Dorosz D., Żmojda J., Kochanowicz M., Dorosz J.
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issue 6
1108-1112
EN
In the article there are presented two different series of glass: fluorophosphate with molar composition: 65P_2O_5-8Al_2O_3-2BaO-5BaF_2-6ZnF_2-5Na_2O-6MgF_2-3B_2O_3 and antimony glasses 40Sb_2O_3-3Al_2O_3-57SiO_2 doped with Nd^{3+} and Yb^{3+} ions. Dopant contents influence efficient spatial overlapping of emission level for neodymium and absorption level for ytterbium was analyzed. While exciting the produced glasses with a laser diode (λ = 808 nm) a broad luminescence spectrum (Δλ = 100 nm) has been obtained in both cases in the vicinity of 1 μm, being the superposition of the following transitions: ^4F_{3/2} → {^4I_{11/2}} for Nd^{3+} and ^2F_{5/2} → {^2F_{7/2}} for Yb^{3+}. Based on the luminescence measurements the probability of non-radiative energy transfer was described. Because of a small difference in energy ( ≈1190 cm^{-1}) between the laser levels of neodymium and ytterbium the resonant process of energy transfer has been obtained.
7
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Effect of Temperature on Upconversion Luminescence in Yb^{3+}/Tb^{3+} Co-Doped Germanate Glass

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Kochanowicz M., Dorosz D., Zmojda J., Miluski P., Dorosz J.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
471-473
EN
In the article effect of temperature on the cooperative energy transfer in germanate glass co-doped with $Yb^{3+}/Tb^{3+}$ under 976 nm laser diode pumping was investigated. The optimization of $Tb^{3+}$ concentration on the upconversion luminescence was determined. Strong luminescence at 489, 543, 586, 621 nm corresponding to $^{5}D_{4} → ^{7}F_{J}$ (J = 6,4,3) transitions and luminescence at 381, 415, 435 nm resulting from $^{5}D_{3}, ^{5}G_6 → ^{7}F_{J}$ (J=6,5,4) transitions were presented. The highest upconversion emission intensity was obtained in glass co-doped with $0.7Yb_{2}O_{3}/0.7Tb_{2}O_{3}$ (mol%). The effect of temperature on the luminescent properties of germanate glass in the range of 5-250°C indicates the presence of competing phenomena: an increase in the effective absorption cross-section of $Yb^{3+}$ ions donor as a function of temperature and migration of energy between pairs of ions $Yb^{3+}-Yb^{3+}$ and of multiphonon excitation levels $^{7}F_{J}$.
8
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Beam Quality of Multicore Fibre Lasers

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Kochanowicz M., Dorosz D., Żmojda J., Dorosz J.
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issue 6
1177-1182
EN
In the paper the beam quality of the phase-locked multicore fibre lasers was investigated. The beam quality factor (BQF) of the coherently combined beam of the multicore fibre lasers should be determinate as the laser optical output power in a central peak far-field bucket divided by the total optical output power radiating from the effective near-field. Classical M^2 factor is not proper for evaluating the beam quality of phase-locked multicore fibre lasers because it degrades with the increasing number of cores. The beam quality factor of the manufactured multicore fibres equals: 7-core hexagonal structure fibre (BQF = 0.71, V = 2.4), 5-core (BQF = 0.70, V = 2.4), 30-core circular structure of core optical fibre laser possesses the lowest beam quality factor (BQF = 0.48, V = 2.4). However, the angular divergence of the central peak is reduced in proportion to the number of cores generating mutually coherent radiation. Numerical simulation shows that standard deviation of the phase error below 15° has an inconsiderable impact on the laser beam quality. The luminescence spectra of the fabricated constructions: 5-core, 7-core and 30-core double clad multicore optical fibres doped with Nd^{3+} were measured.
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