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Agency: Cordis | Branch: FP7 | Program: CP | Phase: ICT-2011.3.5 | Award Amount: 3.63M | Year: 2011

The project CHARMING aims at developing compact and fully fibred visible lasers for fluorescencespectroscopy, high resolution confocal microscopy and tryptophan imaging. These applications requirepulsed operation (about 100 ps at repetition rates from 1 to 80 MHz), various wavelengths in the visible(from 515 to 630 nm typically) and in the UV (for tryptophan imaging), high average power (up to 500 mW for high resolution) with a polarisation maintaining fibre delivery when possible.These wavelengths cannot, in most of the cases, be addressed directly. Therefore, in order to respond tothese applications with fibre based solutions different technological building blocks have to be developed.The project CHARMING will focus on the development of semiconductor laser sources in the 1.1 m to1.2 m band, Bismuth and Raman amplifiers, pulse gating and wavelength conversion fibre basedsolutions. This last function is certainly the more challenging in the project.Periodically Poled Singlemode Fibres (PPSF) for Second Harmonic Generation (SHG) have beenproven at laboratory scale but breakthrough approaches are required for this technology to be integrated in future systems. Various innovative approaches, in particular the use of Micro-structured Optical Fibres (MOF), will be investigated to convert this promising technology into potential products.SHG and other functions developed in CHARMING will be integrated in gain-switched and modelockedlasers at different wavelengths in the visible. The compatibility of these sources with the requirements of the imaging applications targeted in the project will be demonstrated.Finally, the performances of the devices will be pushed beyond these specifications (in the Watt level)for targeting a broader potential impact (like for instance, applications in micromachining).

Kamynin V.A.,RAS A.M. Prokhorov General Physics Institute | Kurkov A.S.,RAS A.M. Prokhorov General Physics Institute | Mashinsky V.M.,Fiber Optics Research Center
Laser Physics Letters | Year: 2012

We have realized supercontinuum source based on the silica-cladding fiber with the germanate-glass-core pumped by Q-switched Er-doped fiber laser. The long-wavelength edge of the spectrum obtained is located at 2.7 μm. To our best knowledge it is the longest wavelength for the silica based fiber. Average output power as high as 0.49 W was measured. Intensity variation in the range of 1.6 - 2.7 μm was much less than one decade. The fibers with different lengths were tested. © 2012 by Astro Ltd., published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA.

Kononenko V.V.,RAS A.M. Prokhorov General Physics Institute | Konov V.V.,RAS A.M. Prokhorov General Physics Institute | Dianov E.M.,Fiber Optics Research Center
Optics Letters | Year: 2012

The processes, induced by local action of the IR femtosecond laser pulse (? + 1.2 μm, t + 250 fs) in the bulk of silicon monocrystal, are studied. Infrared femtosecond interferometry was for the first time applied for visualization of beam propagation inside opaque materials. Dependences of laser-induced variation of material polarizability on pulse energy were obtained and essential wave-packet spreading in space was revealed. This leads to huge delocalization of light-scattering outside the beam caustic exceeds 99% of pulse energy. This effect results in extremely high optical damage threshold of crystalline silicon bulk-irreversible changes in material structure and optical properties were not observed for pulse energy up to 90 μJ. The role of beam Kerr self-focusing and defocusing by an electron-hole plasma inside c:Si is discussed. © 2012 Optical Society of America.

Dianov E.M.,Fiber Optics Research Center
Quantum Electronics | Year: 2010

Based on analysis of the structure and optical properties of Tl, Pb and Bi centres in crystals and comparison of their spectra with the near-IR luminescence spectra of bismuth-doped glasses, a model is proposed for the near-IR emitting bismuth centres in glass. Experimental evidence is presented in support of the model. © 2010 Kvantovaya Elektronika and Turpion Ltd.

Dianov E.M.,Fiber Optics Research Center
Quantum Electronics | Year: 2010

Abstract. This paper presents a brief overview of the state of the art in fibre optics and its main applications: optical fibre communications, fibre lasers and fibre sensors for various physical property measurements. The future of fibre optics and the status of this important area of the modern technology in Russia are discussed. © 2010 Kvantovaya Elektronika and Turpion Ltd.

Dianov E.M.,Fiber Optics Research Center
Physics-Uspekhi | Year: 2013

The rapid advancement of science and technology in the 19th century resulted in more efficient means of communication, but the demand for information exchange always exceeded technical capabilities. That is why the achievements in science and technology were employed first of all to develop the means of communication. The Chappe brothers built the first optical telegraph between Paris and Lille in 1794, which consisted of a chain of towers located within line of sight distance from each other. Messages were visually transferred from tower to tower by semaphore alphabet. The world's longest optical telegraph line operated between Petersburg and Warsaw and it took 15 minutes to transmit signals. An American artist and entrepreneur Samuel Morse invented an electromagnetic telegraph set and a dot-and-dash code in 1837 to develop more efficient means of communication.

Dianov E.M.,Fiber Optics Research Center
Laser Physics Letters | Year: 2015

Despite the great success in the development of the Bi-doped fibers technology and the creation of Bi-doped fiber lasers and optical amplifiers, some problems are not solved yet. The main problem is that the nature of bismuth NIR emitting centers is not clear. At present, a number of hypotheses are published, but none of them have been directly confirmed. The aim of this letter is to discuss briefly some of the existing hypotheses and to propose our approach concerning the nature of Bi-related NIR active centers. In previous publications we suggest that Bi-related NIR emitting centers are clusters, consisting of Bi ions and oxygen deficiency centers but not Bi ions themselves. In this letter we present the results of our experiments which confirm this structure of the Bi NIR active centers in germanosilicate fibers. © 2015 Astro Ltd.

Dianov E.M.,Fiber Optics Research Center
Light: Science and Applications | Year: 2012

It has recently been demonstrated that Bi-doped glass optical fibers are a promising active laser medium. Various types of Bi-doped optical fibers have been developed and used to construct Bi-doped fiber lasers and optical amplifiers. This paper reviews the recent results regarding the luminescence properties of various Bi-doped optical fibers and the development of Bi-doped fiber lasers and optical amplifiers for the 1150 to 1550 nm spectral region. © 2012 CIOMP. All rights reserved.

Dianov E.M.,Fiber Optics Research Center
Journal of Lightwave Technology | Year: 2013

Bismuth-doped optical glasses emit NIR luminescence in an ultrabroad spectral region of 1000-2000 nm. It makes Bi-doped glasses and glass optical fibers a promising active medium for the creation of Bi-doped fiber lasers and broadband optical amplifiers for this spectral region. Since the first fabrication of Bi-doped fibers in 2005 a large number of papers devoted to the development of Bi-doped fiber lasers and optical amplifiers have been published. It has been shown that Bi-doped fibers are a new breakthrough in active laser materials. © 1983-2012 IEEE.

Fiber Optics Research Center | Date: 2011-12-23

The invention relates to optical fiber communications. A multicore optical fiber comprises at least two light-guiding cores made of doped fused silica with refractive indices n_(c1), n_(c2), n_(ck), each light-guiding core of the at least two light-guiding cores being surrounded by a respective arbitrarily shaped inner reflecting cladding made of fused silica or doped fused silica with refractive indices nc_(11), nc_(12), n_(clk), which are less than the refractive indices n_(c1), n_(c2), n_(ck )of respective light-guiding cores; a continuous or intermittent barrier region made of fused silica and having an arbitrary cross-sectional shape, the barrier region being formed in the space between the inner reflecting claddings and an outer cladding of fused silica with refractive index n_(0), the barrier region having refractive index n_(b), which is less than the refractive index of each of the inner reflecting claddings; and an external protective coating. In another embodiment the barrier region can be formed of through holes in fused silica or doped fused silica.

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