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    Wyświetlanie 1-14 z 14
    Tytuł:
    Multicore Optical Fibres for an External Talbot Cavity
    Autorzy:
    Dorosz, D.
    Kochanowicz, M.
    Dorosz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795793.pdf
    Data publikacji:
    2009-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.-i
    42.79.Ag
    33.20.Kf
    42.25.Bs
    Opis:
    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.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 3; 298-301
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopic Properties of $Yb^{3+}//Tb^{3+}$ Doped Germanate Glasses
    Autorzy:
    Kochanowicz, M.
    Dorosz, D.
    Żmojda, J.
    Dorosz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1417968.pdf
    Data publikacji:
    2012-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.-i
    42.79.Ag
    42.70.-a
    Opis:
    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 $\text{}5D_4 \rightarrow \text{}^7 F_{J} $ (J = 6, 4, 3) transitions and luminescence at 381, 415, 435 nm results from $\text{}5 D_3, \text{}^5 G_6 \rightarrow \text{}^7 F_{J}$ (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.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 5; 837-840
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Fibre Current Sensor for Electric Power Industry
    Autorzy:
    Barczak, K.
    Pustelny, T.
    Dorosz, D.
    Dorosz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506714.pdf
    Data publikacji:
    2010-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.-a
    42.81.-i
    42.79.Pw
    78.20.Ls
    Opis:
    The paper deals with the optical fibre current sensor based on new optical fibre made of glass with a high value of refractive index. This kind of glass was developed to meet the requirements of these optical fibres. The aim of investigations was to develop a new optical fibre with adequate magneto-optical properties and a relatively weak linear birefringence resulting from the process of its production. These features are of essential importance for optical fibre current sensors. The results of investigations concerning such optical fibres have been presented, displaying satisfactory magneto-optical properties, as well as only low linear birefringence induced by stresses arising in the course of their manufacturing.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 6; 1087-1089
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    $Nd^{3+}//Yb^{3+}$ Doped Phosphate and Antimony Glasses for Optical Fibre Source
    Autorzy:
    Dorosz, D.
    Żmojda, J.
    Kochanowicz, M.
    Dorosz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506744.pdf
    Data publikacji:
    2010-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.-i
    42.79.Ag
    33.20.Kf
    42.25.Bs
    Opis:
    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: $\text{}^4F_{3//2} \rightarrow {\text{}^4I_{11//2}}$ for $Nd^{3+}$ and $\text{}^2F_{5//2} \rightarrow {\text{}^2F_{7//2}}$ 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.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 6; 1108-1112
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New Optical Glasses with High Refractive Indices for Applications in Optical Current Sensors
    Autorzy:
    Barczak, K.
    Pustelny, T.
    Dorosz, D.
    Dorosz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795777.pdf
    Data publikacji:
    2009-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.-a
    42.81.-i
    42.79.Pw
    78.20.Ls
    Opis:
    The paper concentrates on the optical fibre sensors of electric current intensity. The specially elaborated glasses with high values of refractive indices were investigated in the prepared testing stand. The glasses have possessed the refractive index values n in the range 1.6 ≤ n ≤ 2.2. For the glasses the values of the Verdet constants for two waveguides: $λ_1$ = 635 nm and $λ_2$ = 1550 nm were determined. The obtained results showed that the elaborated on the base of new glasses optical fibres are much more sensitive on the action of magnetic field than the silica fibres.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 3; 247-249
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The New Sensing Fibre for Application in Optical Fibre Current Sensor
    Autorzy:
    Barczak, K.
    Pustelny, T.
    Dorosz, D.
    Dorosz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811528.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Ls
    42.81.Gs
    42.81.Pa
    42.81.Qb
    Opis:
    The present paper deals with investigations concerning optical fibre current sensors. They are mainly applied in measurements of the intensity of the electric current in the power lines as so-called optical transformers of the electrical current. The most important advantages of fibre current sensors are: safety of service, insulating power as well as their insensitiveness to electromagnetic interference. The investigations were concentrated on designing of adequate sensing fibre, and particularly on the choice of an adequate kind of glass, of which this fibre could be made. Besides, also the head of the fibre current sensor was designed, basing on the suggested and produced sensing fibre. The paper presents the results of magneto-optic tests of the glass and the sensing fibre.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6A; A-3-A-6
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Upconversion Luminescence in $Yb^{3+}//Tm^{3+}$ Doped Double Clad Optical Fibre
    Autorzy:
    Zmojda, J.
    Dorosz, D.
    Kochanowicz, M.
    Dorosz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493312.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.-i
    42.79.Ag
    33.20.Kf
    42.25.Bs
    Opis:
    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 $\text{}^1 G_4 \rightarrow \text{}^3 H_6$ 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 $Yb^{3+} \rightarrow Tm^{3+}$ 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 $\text{}^1 D_2 \rightarrow \text{}^3 H_6$ transition.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 776-781
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Beam Quality of Multicore Fibre Lasers
    Autorzy:
    Kochanowicz, M.
    Dorosz, D.
    Żmojda, J.
    Dorosz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506798.pdf
    Data publikacji:
    2010-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.-i
    42.79.Ag
    33.20.Kf
    Opis:
    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.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 6; 1177-1182
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single Mode High Refractive Index Optical Fibres
    Autorzy:
    Dorosz, D.
    Barczak, K.
    Pustelny, T.
    Dorosz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811520.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Pa
    42.81.-i
    42.81.Qb
    Opis:
    The present paper is focussed on the search of technology of new kinds of optical fibers characterised by good magnetooptical properties. The elaborated optical fibres are to apply in optical sensors of electric current and the magnetic field. In result of these researches and analyses a new optical fibre was put forward. Such optical fibers were designed, produced and subjected to extensive tests. This paper presents the results of investigations that were carried out as well as the parameters of the tested structures.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6A; A-63-A-68
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    $Tm^{3+}//Ho^{3+}$-Doped ASE Fibre Source for Mid-Infrared Sensor Applications
    Autorzy:
    Dorosz, D.
    Żmojda, J.
    Kochanowicz, M.
    Miluski, P.
    Dorosz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418068.pdf
    Data publikacji:
    2012-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.-i
    42.79.Ag
    33.20.Kf
    Opis:
    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 $\text{}^3 F_4 (Tm^{3+}) \rightarrow \text{}^5 text{|}_7 (Ho^{3+})$ 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.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 5; 927-932
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescent Polymer Optical Fibre Sensor for Temperature Measurement
    Autorzy:
    Miluski, P.
    Dorosz, D.
    Żmojda, J.
    Kochanowicz, M.
    Dorosz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398851.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.-i
    42.81.Wg
    42.79.-e
    42.70.Jk
    Opis:
    In the paper the luminescence optical fiber used as a temperature sensor is presented. The new construction of rhodamine B doped, polymethyl methacrylate optical fibre with silver coating is shown. The fabrication process and luminescent properties of rhodamine B in sensing fibre are investigated. The attenuation and spectral shift of luminescence peak vs. the fibre length were measured and used for optimization of sensor construction. The characteristics of sensor for temperature range from 293 up to 343 K are shown. The relative sensitivity equal to -5.4× $10^{-4}$ $K^{-1}$ was obtained. The article presents also the potential applications of presented sensor.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3; 730-733
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Temperature on Upconversion Luminescence in $Yb^{3+}//Tb^{3+}$ Co-Doped Germanate Glass
    Autorzy:
    Kochanowicz, M.
    Dorosz, D.
    Zmojda, J.
    Miluski, P.
    Dorosz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399372.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.-a
    42.79.Ag
    42.81.-i
    Opis:
    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 $\text{}^{5}D_{4} \rightarrow \text{}^{7}F_{J}$ (J = 6,4,3) transitions and luminescence at 381, 415, 435 nm resulting from $\text{}^{5}D_{3}, \text{}^{5}G_6 \rightarrow \text{}^{7}F_{J}$ (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 $\text{}^{7}F_{J}$.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 471-473
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    White Upconversion in $Yb^{3+}//Tm^{3+}//Ho^{3+}$ Co-Doped Antimony-Germanate Glasses
    Autorzy:
    Żmojda, J.
    Dorosz, D.
    Kochanowicz, M.
    Miluski, P.
    Dorosz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399412.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.-i
    42.79.Ag
    33.20.Kf
    42.25.Bs
    Opis:
    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 $\text{}^{1}G_{4} \rightarrow \text{}^{3}H_{6}(Tm^{3+})$, green $\text{}^{5}F_{4} \rightarrow \text{}^{5}I_{8}(Ho^{3+})$ and red $\text{}^{5}F_{5} \rightarrow \text{}^{5}I_{8}(Ho^{3+})$ 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.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 598-601
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Sensor of the Magnetic Field in Electrical Power Engineering
    Autorzy:
    Barczak, K.
    Pustelny, T.
    Zycki, Z.
    Blazejczyk, T.
    Dorosz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506720.pdf
    Data publikacji:
    2010-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.-a
    42.81.-i
    42.79.Pw
    78.20.Ls
    Opis:
    The authors of the presented paper deal with investigations concerning applications of the optical fiber sensor of the magnetic field in electric DC engines with permanent magnets. The aim of the sensor is to measure the state of magnetization of permanent magnets (basing on the measurements of magnetic field induction). The knowledge of the state of magnetization helps to decide whether permanent magnets need to be additionally magnetized in order to prevent damages of the whole engine. This can be done automatically, even when the engine is running. For the purpose the Faraday magnetooptic effect is used. The presented investigations concern an optical fiber sensor of the magnetic field provided with a glass rod characterized a high value of the Verdet constant as the sensing element. Thanks to the application of optical fibers the connection of the sensor head with the whole measuring system is constructed of insulating material without using of electrical connections.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 6; 1090-1092
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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