-
[show abstract]
[hide abstract]
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
-
[show abstract]
[hide abstract]
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
-
[show abstract]
[hide abstract]
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
-
[show abstract]
[hide abstract]
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;
-
[show abstract]
[hide abstract]
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
-
[show abstract]
[hide abstract]
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
-
[show abstract]
[hide abstract]
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;
-
[show abstract]
[hide abstract]
ABSTRACT: The influence of fiber glass composition on dynamics of pump-induced refractive index changes in Yb-doped silicate fibers is reported. The Yb-ions polarizability difference responsible for the effect is determined for fibers with different Yb-ion lifetimes.
Lasers and Electro-Optics, 2009 and 2009 Conference on Quantum electronics and Laser Science Conference. CLEO/QELS 2009. Conference on; 07/2009
-
[show abstract]
[hide abstract]
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
-
[show abstract]
[hide abstract]
ABSTRACT: The recent results on the new laser material – Bidoped glasses and optical fibers are reviewed. First, luminescence properties of various Bi-doped glasses are discussed. At last the results of investigations of Bi-doped fiber lasers covering a wavelength range of 1150–1550 nm are presented. (© 2009 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA)
Laser Physics Letters 03/2009; 6(7):487 - 504. · 9.97 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: Photodarkening of ytterbium-doped laser fibers is an important problem, as it is directly associated with the fiber lasers and amplifiers durability. The phenomenon manifests itself as the growth of optical losses in the process of fiber usage under the action of pump radiation. In this paper the comparison of the parameters of this process for alumosilicate and phosphosilicate Yb-doped fibers is performed for the first time. And it was found that normalized phosphosilicate fibers are a good alternative to alumosilicate ones, especially for the operation in case of high value of upper level population.
Lasers and Electro-Optics, 2007 and the International Quantum Electronics Conference. CLEOE-IQEC 2007. European Conference on; 07/2007
-
[show abstract]
[hide abstract]
ABSTRACT: CW lasing of Bi-doped fiber lasers in a wavelength range of 1150-1215 ran with output power up to 15W has been obtained for the first time. The unsaturable optical losses in Bi-doped fibers have been revealed.
Optical Fiber Communication and the National Fiber Optic Engineers Conference, 2007. OFC/NFOEC 2007. Conference on; 04/2007
-
V V Dvoyrin,
V M Mashinsky,
L I Bulatov, I A Bufetov,
A V Shubin,
M A Melkumov,
E F Kustov,
E M Dianov,
A A Umnikov,
V F Khopin,
M V Yashkov,
A N Guryanov
[show abstract]
[hide abstract]
ABSTRACT: Optical fibers with bismuth-doped silicate and germanate glass cores were fabricated by the modified chemical vapor deposition technique (solution and vapor-phase Bi incorporation). The fibers revealed an efficient luminescence with a maximum in the 1050-1200 nm spectral range, FWHM up to 200 nm, and a lifetime of the order of 1 ms.
Optics Letters 11/2006; 31(20):2966-8. · 3.40 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: A “fast,” detonation-like mode of the propagation of an optical discharge with velocities up to 3 km/s is observed in a silica
optical fiber at the laser radiation intensity in the core up to 40 W/μm2.
JETP Letters 02/2006; 83(2):75-78. · 1.35 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: The dynamics of fiber fuse effect including process of bubble formation in fiber core was investigated. Bubbles in the core were observed not later than 20÷70 μs after the plasma forepart passed. For the first time, the temperature of optical discharge was measured for a wide range of laser radiation powers. For 40-W laser power, the temperature reached 10<sup>4</sup> K, the velocity of discharge propagation having increased to 10 m/s.
IEEE Photonics Technology Letters 02/2006; · 2.19 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: The fast mode of optical discharge propagation in optical fibres has been discovered. In contrast to the known fibre fuse effect such optical discharge propagation is accompanied by fibre cracks and velocity reaches = 3 km/s under the intensity ≈40 W/m<sup>2</sup>.
Optical Communication, 2005. ECOC 2005. 31st European Conference on; 10/2005
-
[show abstract]
[hide abstract]
ABSTRACT: For the first time the temperature of optical discharge was measured for a wide range of laser radiation powers. For 40 W laser power the temperature reached 10<sup>4</sup> K, velocity of discharge propagation having increased to 10 m/s.
Optical Communication, 2005. ECOC 2005. 31st European Conference on; 10/2005
-
[show abstract]
[hide abstract]
ABSTRACT: We describe an ultrafast Nd-doped fibre laser capable of generating 170 fs pulses in the 920 nm spectral range with output power of 0.8 W.
Lasers and Electro-Optics, 2005. (CLEO). Conference on; 06/2005
-
[show abstract]
[hide abstract]
ABSTRACT: Raman amplification and generation in single mode fiber with germania-based core and silica cladding were investigated in 1.1-2.2 μm spectral range. Fiber laser output power up to 10 W was obtained.
Optical Fiber Communication Conference, 2005. Technical Digest. OFC/NFOEC; 04/2005
-
[show abstract]
[hide abstract]
ABSTRACT: The dynamics of the fiber fuse effect, including the process of bubble formation in the fiber core, was investigated for the first time. Bubbles in the core were observed not later than 20-70 μs after the passing of the plasma leading edge.
Optical Fiber Communication Conference, 2005. Technical Digest. OFC/NFOEC; 04/2005
