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D A Gaponov,
L V Kotov,
M E Likhachev,
M M Bubnov,
A Cabasse,
J-L Oudar,
S Fevrier,
D S Lipatov,
N N Vechkanov, A N Guryanov,
G Martel
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ABSTRACT: Direct amplification of output from chirped pulse oscillator (CPO) to 3.3 W of average power (pulse energy of 118 nJ in 20 ps pulse duration before compression) was achieved in a properly designed cladding pumped large mode area Er-doped fiber. Various configurations of CPO cavity with different FWHM of output spectrum and pulse duration were investigated. Fourier limit compression with 480 fs pulse duration and 32 kW peak power has been obtained for pulses with 14.8 nm FWHM spectrum. Subsequent nonlinear compression in a standard SMF-28 fiber yielded pulses as short as 145 fs.
Optics Letters 08/2012; 37(15):3186-8. · 3.40 Impact Factor
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ABSTRACT: An efficient CW bismuth fiber laser operating around 1.46 μm with an efficiency of >50% and an output power of >20 W has been developed on a bismuth-doped GeO(2)-SiO(2) fiber. The laser demonstrates weak dependence of the output power on temperature in comparison with bismuth lasers operating near 1.15 and 1.3 μm. The laser generation has been obtained in the range 1.39 to 1.54 μm. The first linearly polarized bismuth-doped fiber laser at 1.46 μm based on a PANDA-type fiber has been demonstrated.
Optics Letters 07/2012; 37(13):2589-91. · 3.40 Impact Factor
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ABSTRACT: This work examines vapor-phase doping of aluminophosphosilicate (APS) glasses with erbium oxide using Er(dpm)3 (erbium dipivaloylmethanate) as a metalorganic precursor. We describe two vapor-phase processes for Er2O3 doping of APS glasses for fiber cores. In one of them, a standard MCVD procedure, all the oxides of the glass core are deposited
simultaneously. With this procedure, the erbium content of the APS glasses does not exceed 1 wt % because of the reaction
of AlCl3 with POCl3 and Er(dpm)3. In the other procedure, a porous Al2O3-P2O5-SiO2 layer is infiltrated with Er2O3 from the vapor phase. Owing to the separation of the reactant flows, this procedure ensures considerably higher rare-earth
doping levels in the APS glasses, up to several weight percent.
Inorganic Materials 04/2012; 46(4):439-444. · 0.41 Impact Factor
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ABSTRACT: We have studied the effects of preform fabrication procedure and ytterbium and erbium concentrations on the efficiency of
excitation transfer from Yb3+ to Er3+ and lasing on erbium transitions in the range 1.53–1.61 μm in phosphosilicate glass fibers. The results indicate that the
fabrication of fiber preforms by different MCVD-based processes has no effect on the excitation transfer efficiency. In the
ranges 0.07–0.4wt % Er3+ and ∼ 0.4–8 wt % Yb3+ (Yb/Er ratio from ∼ 5 to 40), the excitation transfer efficiency is determined by the ytterbium concentration and is essentially
independent of erbium concentration.
Inorganic Materials 04/2012; 46(3):299-303. · 0.41 Impact Factor
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ABSTRACT: The dependence of fluorine incorporation into silica glass on conditions of the optical waveguide blank manufacture using
the method of modified chemical vapor deposition (MCVD) is studied. The degree of fluorine incorporation at constant consumption
of a fluoridizer (SiF4) is shown to increase with an increase in the volume of deposited material. Samples of multimode optical waveguides with
a core from pure silica glass and a reflective coating made of fluorine-doped silica glass with a numerical aperture of ∼0.18
are obtained. Optical losses in such optical waveguides reach 0.5 dB/km in the long-wavelength region of the spectrum.
Inorganic Materials 04/2012; 45(7):823-826. · 0.41 Impact Factor
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ABSTRACT: We have studied the size distribution of silica glass particles in the fabrication of heavily doped germanosilicate glass
fiber preforms by modified chemical vapor deposition (MCVD) at different Freon 113 concentrations in the gas mixture. The
addition of Freon 113 to the gas mixture is shown to reduce the particle size in the deposited core glass layer and the optical
loss in the fiber. A mechanism is proposed which accounts for the effect of the initial particle size in the core glass layer
on the anomalous scattering and total optical loss in heavily doped step- and graded-index fibers.
Inorganic Materials 04/2012; 46(5):556-562. · 0.41 Impact Factor
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ABSTRACT: The optical properties of optical fibers based on silica glass doped with bismuth and co-doped with aluminum oxides and/or
germanium, phosphorus, and titanium oxides are studied. The optical loss and luminescence spectra of optical fibers substantially
depend on the core composition. The gain spectra of single-mode optical fibers are measured in the IR range. It is demonstrated
that the phosphorus-germanium-silicate optical fiber doped with bismuth exhibits a broad gain band (1270–1520 nm) when pumped
at a wavelength of 1230 nm. It is also shown that the bismuth-aluminosilicate optical fibers additionally doped with Ge or
Ti at about 1 at % have the gain spectra that are significantly narrower than the IR luminescence spectra (in contrast to
the fibers that do not contain Ge and Ti). The intensity decay curves of the IR luminescence in such fibers indicate the presence
of both short-lived (with the lifetime τ≤4 μs) and long-lived (τ ∼ 1 ms) energy levels in the bismuth active centers.
Laser Physics 04/2012; 19(4):894-901. · 3.61 Impact Factor
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ABSTRACT: The temperature dependences of optical loss and luminescence spectra have
been measured in visible and NIR spectral range for Bi-doped silica and
Bi-doped germanosilicate fibers for the first time. The temperature dependence
of luminescence lifetime for Si-associated active bismuth centers in
germanosilicate fiber was measured. It has been revealed, that distribution of
Bi3+ ions across the fiber preform is essentially different as compared to that
of NIR active bismuth centers. Data received indicates that NIR-active centers
are associated with the low oxidation state of bismuth ion and/or oxygen
deficient center of the glass structure.
01/2012;
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ABSTRACT: For the first time, 3-dimensional luminescence spectra (luminescence intensity as a function of the excitation and emission wavelengths) have been obtained for bismuth-doped optical fibers of various compositions in a wide spectral range (450-1700 nm). The bismuth-doped fibers investigated have the following core compositions: SiO(2), GeO(2), Al-doped SiO(2), and P-doped SiO(2). The measurements are performed at room and liquid nitrogen temperatures. Based on the experimental results, the positions of the low-lying energy-levels of the IR bismuth active centers in SiO(2)- and GeO(2)-core fibers have been determined. Similarity of the energy-level schemes for the two core compositions has been revealed.
Optics Express 09/2011; 19(20):19551-61. · 3.59 Impact Factor
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ABSTRACT: A 24 dB gain bismuth-doped fiber amplifier at 1430 nm pumped by a 65 mW commercial laser diode at 1310 nm is reported for the first time (to our knowledge). A 3 dB bandwidth of about 40 nm, a noise figure of 6 dB, and a power conversion efficiency of about 60% are demonstrated. The temperature behavior of the gain spectrum is examined.
Optics Letters 07/2011; 36(13):2408-10. · 3.40 Impact Factor
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ABSTRACT: 3D excitation-emission luminescence spectra of Bi-doped optical fibers of
various compositions were measured in a wide wavelength range 450-1700 nm. Such
luminescence spectra were obtained for Bi-doped pure silica and germania
fibers, and for Bi-doped Al- or P-codoped silica fibers (at room and liquid
nitrogen temperatures). The energy level schemes of IR bismuth active centers
in pure silica and germania core fibers were derived from spectra obtained. The
energy level schemes similarity of bismuth active centers in these two types of
fibers was revealed.
06/2011;
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ABSTRACT: A novel all-fiber laser based on a highly GeO2-doped dispersion-shifted Tm-codoped fiber, pumped at 1.56 µm wavelength and lasing at 1.862 µm wavelength with a slope efficiency up to 37% was demonstrated. The single-mode Tm-doped fiber with the 55GeO2-45SiO2 core was fabricated for the first time by MCVD technique. The laser produces spectral side bands, resulting from the four-wave mixing owing to the shift of the zero-dispersion-wavelength of the fiber to the laser wavelength, thus, making it potentially particularly attractive for dispersion management and ultrashort pulse generation.
Optics Express 04/2011; 19(9):7992-9. · 3.59 Impact Factor
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D.A. Gaponov,
S. Fevrier,
P. Roy,
L. Daniault,
M. Hanna,
F. Druon,
P. Georges,
M.E. Likhachev,
S.S. Aleshkina,
M.Y. Salganskii,
M.V. Yashkov, A.N. Guryanov
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ABSTRACT: The use of 40 μm diameter core Yb-doped Bragg fibers in two-stage CPA system is reported with maximum amplified pulse energy limited by the experimental set-up only. 82 W average output power before compression from photonic bandgap fiber was obtained.
Optical Communication (ECOC), 2010 36th European Conference and Exhibition on; 10/2010
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ABSTRACT: Very large-mode-area Yb(3+)-doped single-mode photonic bandgap (PBG) Bragg fiber oscillators are considered. The transverse hole-burning effect is numerically modeled, which helps properly design the PBG cladding and the Yb(3+)-doped region for the high-order mode content to be carefully controlled. A ratio of the Yb(3+)-doped region diameter to the overall core diameter of 40% allows for single-mode emission, even for small spool diameters of 15 cm. Such a fiber was manufactured and subsequently used as the core element of a cw oscillator. Very good beam quality parameter M(2)=1.12 and slope efficiency of 80% were measured. Insensitivity to bending, exemplified by the absence of temporal drift of the beam, was demonstrated for curvature diameter as small as 15 cm.
Optics Letters 07/2010; 35(13):2233-5. · 3.40 Impact Factor
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ABSTRACT: In this study, bismuth-doped fiber lasers operating at the wavelength of 1179 nm with an optical efficiency of up to 28% are realized. The fiber gain upon 1-¿m pumping declines, while the unsaturable absorption increases with increasing the small-signal absorption. We conclude that up-conversion and excited-state absorption are responsible for limiting the efficiency of such lasers.
IEEE Journal of Quantum Electronics 03/2010; · 1.88 Impact Factor
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ABSTRACT: The Bi-doped fiber lasers operating at wavelengths of 1280 nm, 1330 nm, 1480 nm, and 1500 nm with a maximal output power of up to 2 W and a slope efficiency of 14–25% have been demonstrated for the first time. We have also investigated the influence of the doping concentration (GeO2 and P2O5) on the optical and laser generation properties of Bi-doped phosphogermanosilicate fibers. (© 2009 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA)
Laser Physics Letters 06/2009; 6(9):665 - 670. · 9.97 Impact Factor
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ABSTRACT: An emission band with a maximum at 1430 nm and a FWHM of 100 nm was observed in a Bi-doped fiber under core-pumping in the 1340- 1370 nm wavelength range. Net gain in 1430-1490 nm and laser action in 1443-1459 nm wavelength range in the Bi-doped aluminosilicate fiber have been demonstrated for the first time to our knowledge.
Optics Express 11/2008; 16(21):16971-6. · 3.59 Impact Factor
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ABSTRACT: Fabrication technique and spectroscopic study of MCVD Bi-Na-doped phosphosilicate glass core optical fibres are discussed. The fibres reveal a broadband luminescence with the maximum in 1300 nm range.
Optical Communication, 2008. ECOC 2008. 34th European Conference on; 10/2008
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ABSTRACT: H-free and H-loaded pieces of a carbon-coated erbium-doped fiber (EDF) are gamma-irradiated to doses in the range 0.1-10 kGy. In three months after the irradiation, optical loss spectra and lasing efficiency of the fibers are studied. It is found that the slope efficiency of a laser based on an irradiated EDF quickly grows under the action of pumping at the wavelength of 980 nm, owing to photobleaching of radiation-induced color centers. Photobleaching is found to be much more efficient in H<sub>2</sub>-loaded EDFs. No photobleaching occurs with pumping at 1480 nm. Pumping at 980 nm is argued to ensure a sufficiently long service life of H<sub>2</sub>-loaded EDFs in space, much longer than in the case of pumping at 1480 nm.
IEEE Photonics Technology Letters 10/2008; · 2.19 Impact Factor
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ABSTRACT: Radiation-induced absorption and lasing efficiency of a hermetically coated erbium-doped fiber saturated with molecular hydrogen are studied. It is shown that H<sub>2</sub>-loading of hermetically coated erbium-doped fibers prolongs their service time in space more than in 5 times, making such fibers promising for space applications.
IEEE Transactions on Nuclear Science 09/2008; · 1.45 Impact Factor
