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Yu Koptev M.,RAS Institute of Applied Physics | Anashkina E.A.,RAS Institute of Applied Physics | Andrianov A.V.,RAS Institute of Applied Physics | Dorofeev V.V.,RAS Institute of Chemistry of High Purity Substances | And 3 more authors.
Optics Letters | Year: 2015

A turnkey fiber laser source generating high-quality pulses with a spectral sech shape and Fourier transform-limited duration of order 100 fs widely tunable in the 1.6-2.65 ìm range is presented. It is based on Raman soliton selffrequency shifting in the suspended-core microstructured TeO2-WO3-La2O3 glass fiber pumped by a hybrid Er/Tm fiber system. Detailed experimental and theoretical studies, which are in a very good agreement, of nonlinear pulse dynamics in the tellurite fiber with carefully measured and calculated parameters are reported. A quantitatively verified numerical model is used to show Raman soliton shift in the range well beyond 3 ìm for increased pump energy. © 2015 Optical Society of America. Source


Kotov L.V.,Fiber Optics Research Center | Likhachev M.E.,Fiber Optics Research Center | Bubnov M.M.,Fiber Optics Research Center | Paramonov V.M.,Fiber Optics Research Center | And 3 more authors.
Laser Physics Letters | Year: 2014

In this paper, we present results on the amplification of 2 MHz linewidth nanosecond pulses in a recently developed ytterbium-free erbium-doped large mode area fiber cladding pumped at 980 nm. A record peak power of 4 kW for single-frequency single-mode silica-based fiber sources near 1550 nm is demonstrated. Pulse instabilities arising in an all-fiber laser scheme from stimulated Brillouin scattering are described. © 2014 Astro Ltd Printed in the UK. Source


Konyukhov A.I.,Chernyshevsky Saratov State University | Romanova E.A.,Chernyshevsky Saratov State University | Shiryaev V.S.,RAS Institute of Chemistry of High Purity Substances
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2011

Chalcogenide glasses are ideal materials for developing fiber lasers and amplifiers, remote sensors, high-speed switches, and other devices that operate in the IR range of 1-10 μm. The nonlinear refractive index of chalcogenide glasses may exceed that of quartz glass by a factor of 100-1200 or even more. The data on the dispersion properties of some chalcogenide glass compositions in the IR range are presented. The possibility of forming waveguide structures with specified dispersion properties (in particular with a fixed wave-length at which the group velocity dispersion is zero) from these glasses is numerically investigated. It is shown by the example of completely glassy periodic waveguide structures with planar geometry that the use of photonic band gap modes makes it possible the change the position of zero dispersion in a wide wavelength range. In the calculations the contrast of waveguide structures was varied using parameters of glasses of different composition. © Pleiades Publishing, Ltd., 2011. Source


Ketkova L.A.,RAS Institute of Chemistry of High Purity Substances
Optical Materials | Year: 2015

3D laser ultramicroscopy (3D LUM) is intended specially for determining the concentration and size distribution of submicron inclusions in the bulk samples of high-purity materials for visible and IR fiber optics. In this work the 3D LUM technique is shown to be able to identify the nature of individual inclusions detected. The measurement of the light scattered by an inclusion at a varied probe beam wavelength and polarization and at a varied scattered light collection angle makes it possible to determine the inclusion refractive index. The 3D LUM possibilities are illustrated by the example of studying the inclusion nature in the As2S3 glass samples prepared by the direct synthesis from elements in a quartz container at elevated temperatures. © 2015 Elsevier B.V. Source


Bufetov I.A.,Fiber Optics Research Center | Melkumov M.A.,Fiber Optics Research Center | Firstov S.V.,Fiber Optics Research Center | Riumkin K.E.,Fiber Optics Research Center | And 4 more authors.
IEEE Journal on Selected Topics in Quantum Electronics | Year: 2014

The current state of the art in infrared Bi-doped fiber laser research is reviewed. The relevant fiber glass compositions and fiber technologies are introduced. Lasers operating on transitions ranging from 1.15 to 1.55 μm occurring in the bismuth active centers and their energy level schemes are discussed on the basis of the spectroscopic properties of these centers. Continuous-wave fundamental-mode power levels ranging from a few mW near 1.55 μm up to 16 W near 1.16 μm and 22 W near 1.46 μm have been demonstrated in recent years. © 1995-2012 IEEE. Source

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