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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:
2.1 žm emission of Tm3+/Ho3+ - doped antimony-silicate glasses for active optical fibre
Autorzy:
Żmojda, J.
Dorosz, D.
Dorosz, J.
Powiązania:
https://bibliotekanauki.pl/articles/200143.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
antimony-silicate glasses
Tm3+/Ho3+ glasses
active optical fibre
Opis:
Tm3+/Ho3+ – doped antimony-silicate optical fibre with 2.1 ěm emission has been presented. Luminescence corresponding to 5I7 --> 5I8 transition in holmium was obtained by energy transfer between Tm3+ and Ho3+ ions. The analysis of the luminescence mechanism showed a significant influence of the glass composition (low phonon content) on the emission intensity. Optimization of the active elements content, presented in the paper, allowed to indicate that a strong emission intensity at 2 ěm in the fabricated glasses was obtained for the molar composition of 1% Tm2O3 : 0.75% Ho2O3. According to the F¨orster-Dexter theory, the efficiency of energy transfer of the 3F4 (Tm3+) --> 5I7 (Ho3+) transition was calculated. Moreover, it was found that the full width at half maximum (FWHM) of luminescence in the range of 1.6 – 2.2 ěm strongly depends on the Tm3+/Ho3+ ratio. The optimization of Tm3+/Ho3+ transfer in antimony-silicate glasses allowed to fabricate optical fibre with narrowing and red-shifting of emission at 2.1 ěm.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 381-387
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase-locking of 19-core Yb3+ - doped optical fibre
Autorzy:
Kochanowicz, M.
Dorosz, D.
Zając, A.
Powiązania:
https://bibliotekanauki.pl/articles/200141.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multicore optical fibre
fibre lasers
ytterbium ions
Opis:
The supermode generation in a multicore optical fibre laser can be realised by phase-locking of radiation inside of the fibre. The model proposed by authors implies the achievement of supermode generation by exchanging radiation between the cores during the development of the laser action. The analysis of the impact of coupling value between the cores on phase radiation of particular emitters was considered. In the paper the phase-locking of 19-core optical fibre doped with Yb3+ ions is presented. The analysis of material and geometrical parameters of the active 19 -core optical fibre and phase deviation on the beam quality factor of the laser beam in the far-field diffraction region has been analysed. The beam quality factor of the manufactured multicore fibre equals BQF = 0.71, V = 2.4, d = 18 ěm. As a result of the conducted analysis a double-clad 19 – cores optical fibre doped with ytterbium ions has been designed and fabricated and its luminescence spectra and far-field diffraction pattern have been measured. Registered in the experiment in MOFPA system far-field pattern showed centrally located peak of relatively high radiation intensity together with smaller side-lobes, and as such was similar to the pattern which had been obtained numerically.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 371-379
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
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:
Światłowodowy iterbowy wzmacniacz impulsów promieniowania o nanosekundowym czasie trwania
Ytterbium-doped fiber amplifier of nanosecond pulses
Autorzy:
Świderski, J.
Skórczakowski, M.
Dorosz, D.
Pichola, W.
Powiązania:
https://bibliotekanauki.pl/articles/211199.pdf
Data publikacji:
2010
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
wzmacniacz światłowodowy
aktywne włókno dwupłaszczowe
generacja impulsowa
fiber amplifier
active double-clad fiber
pulse generation
Opis:
Opracowano nowoczesny układ laserowy: diodowy generator zadający-włóknowy wzmacniacz mocy w wersji dwukaskadowej. Jako generator zadający zastosowano jednomodową impulsową diodę laserową generującą promieniowanie o długości fali 1064 nm, natomiast jako ośrodki wzmacniające wykorzystano włókna dwupłaszczowe domieszkowane iterbem, pompowane promieniowaniem diod laserowych o długości fali 976 nm. Opracowany układ generował impulsy promieniowania o czasie trwania z przedziału 8,5-250 ns przy częstotliwości repetycji od 50 kHz do 500 kHz. Moc średnia na wyjściu układu wynosiła max. 22 W.
The modern two-cascade laser system: diode seed laser-fiber power amplifier was developed. A single-mode pigtailed DFB laser operating at the wavelength of 1064 nm was utilized as an active medium. Ytterbium-doped double-clad optical fibers pumped by laser diodes operating at the wavelength of 976 nm were used as active media. The developed laser system generated the pulses of changeable duration ranging from 8.5 ns to 250 ns at the repetition rate of 50-500 kHz. The max. average power of the output signal was 22 W.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2010, 59, 4; 261-268
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
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:
Active glasses as the luminescent sources of radiation for sensor applications
Autorzy:
Żmojda, J.
Dorosz, D.
Kochanowicz, M.
Dorosz, J.
Powiązania:
https://bibliotekanauki.pl/articles/201797.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tellurite glasses
antimony-silicate glasses
Yb3+
Tm3+
upconversion
blue luminescence
energy transfer
active glasses
Opis:
The article presents physicochemical, thermal and spectroscopic properties of two different glass systems: TeO2-GeO2-PbO-PbF2- BaO-Nb2O5-LaF3 and SiO2-Al2O3-Sb2O3, co-doped with Yb3+/Tm3+ ions. Blue upconversion luminescence at a wavelength of 478 nm corresponding to the thulium 1G4 ⇥3H6 transition was observed under 976 nm pump radiation in both of the co-doped glasses. This indicated the existence of efficient Yb3+ ⇥ Tm3+ energy transfer via three-photon absorption mechanism. Thermal and optical results substantiate the claim for practical applicability of the manufactured glasses in design of optical fiber sources.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 2; 393-397
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
UV Radiation Detection Using Optical Sensor Based on Eu3+ Doped PMMA
Autorzy:
Miluski, P.
Kochanowicz, M.
Żmojda, J.
Dorosz, D.
Powiązania:
https://bibliotekanauki.pl/articles/220742.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultraviolet radiation
UV
optical fibre sensor
lanthanides
Opis:
Progress in UV treatment applications requires new compact and sensor constructions. In the paper a hybrid (organic-inorganic) rare-earth-based polymeric UV sensor construction is proposed. The efficient luminescence of poly(methyl) methacrylate (PMMA) matrix doped by europium was used for testing the optical sensor (optrode) construction. The europium complex assures effective luminescence in the visible range with well determined multi-peak spectrum emission enabling construction of the optrode. The fabricated UV optical fibre sensor was used for determination of Nd:YAG laser intensity measurements at the third harmonic (355 nm) in the radiation power range 5.0-34.0 mW. The multi-peak luminescence spectrum was used for optimization of the measurement formula. The composition of luminescent peak intensity enables to increase the slope of sensitivity up to -2.8 mW-1. The obtained results and advantages of the optical fibre construction enable to apply it in numerous UV detection systems.
Źródło:
Metrology and Measurement Systems; 2016, 23, 4; 615-621
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correction of the electric resistivity distribution of Si wafers using selective neutron transmutation doping (SNTD) in MARIA nuclear research reactor
Autorzy:
Tarchalski, M.
Kordyasz, A. J.
Pytel, K.
Dorosz, D.
Powiązania:
https://bibliotekanauki.pl/articles/146646.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
silicon wafer
thermal neutron doping
silicon resistivity homogeneity
silicon resistivity heterogeneity
neutron transmutation doping (NTD)
selective neutron transmutation doping (SNTD)
MARIA nuclear research reactor
Opis:
The result of the electric resistivity distribution modification in silicon wafers, by means of selective neutron transmutation doping (SNTD) method in the MARIA nuclear research reactor at Świerk/Otwock (Poland) is presented. Silicon wafer doping system has been fully designed for the MARIA reactor, where irradiation took place. The silicon wafer resistivity distribution after SNTD has been measured by the capacity voltage (C-V) method. In this article we show first results of this correction technique. The result of the present investigation is that the planar resolution of the correction process is about 4 mm. It is the full width at half maximum (FWHM) of the resistivity distribution produced by thermal neutrons irradiation of Si wafer through a 3 mm hole in the Cd-mask.
Źródło:
Nukleonika; 2012, 57, 3; 363-367
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 25

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