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Formula for temperature distribution in multi-layer optical fibres for high-power fibre lasers

Grábner Martin, Peterka Pavel, Honzátko Pavel

Opto-Electronics Review

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2021

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Vol. 29, No. 4

126--132

EN

High power fibre lasers need to be cooled efficiently to avoid their thermal damage. Temperature distribution in fibre should be estimated during the fibre laser design process. The steady-state heat equation in a cylindrical geometry is solved to derive a practical formula for temperature radial distribution in multi-layered optical fibres with arbitrary number of the layers. The heat source is located in one or more cylindrical domains. The validity of the analytical formula is tested by comparison with static heat transfer simulations of typical application examples including octagonal double clad fibre, air-clad fibre, fibre with nonuniform, microstructured core. The accuracy sufficient for practical use is reported even for cases with not exactly cylindrical domains.

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Rozwój techniki światłowodowej w Polsce 2017

Romaniuk R., Dorosz J.

Elektronika : konstrukcje, technologie, zastosowania

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2017

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Vol. 58, nr 3

3--11

PL

Konferencja „Światłowody i Ich Zastosowania” odbywa się cyklicznie w kraju od 1976 r., obecnie co półtora roku. Jest organizowana naprzemiennie przez dwa krajowe wiatłowodowe ośrodki technologiczne w Białymstoku (Politechnika) i Lublinie (UMCS). Konferencja światłowodowa gromadzi zainteresowane osoby ze środowisk akademickich, technologicznych, aplikacyjnych, przemysłowych, biznesowych, administracyjnych i podsumowuje okresowe osiągnięcie naukowo-techniczne i aplikacyjne środowiska krajowego, z udziałem gości zagranicznych. Od 1986 roku, konferencja „Optical Fibres and Their Applications – OFTA” jest wspierana przez SPIE poprzez publikację jej materiałów w serii Proc. SPIE. Konferencja zazwyczaj gromadzi ok. 150 osób i prezentowanych jest ok. 100 prac naukowo-technicznych. XVII Konferencja Światłowody i Ich Zastosowania, organizowana przez Politechnikę Białostocką, odbyła się w styczniu br. i zgromadziła podobną liczbę uczestników i prac. Tematyka konferencji, którą można w skrócie określić jako fotonikę światłowodową, obejmuje technologię światłowodów włóknistych aktywnych i biernych, aktywne elementy współpracujące ze światłowodami jak źródła i detektory, światłowodowe elementy funkcjonalne, czujniki światłowodowe, oraz urządzenia, układy i systemy – czujnikowe, sieciowe, transmisyjne. Artykuł przedstawia w skrócie przegląd wybranych prac naukowo-technicznych XVII edycji Konferencji Światłowody i Ich Zastosowania.

EN

The Conference on „Optical Fibres and Their Applications” is held periodically in Poland since 1976, now every 18 months. It is organized alternately by two national optical fibre technological centres in Białystok (Technical University) and Lublin (UMCS University). The conference gathers interested persons from academic communities, technological, application, research and development, industrial, business, and administration ones, and summarizes periodic technical and application achievements of the involved national laboratories and enterprises, with participation of international guests. Since 1986, the conference is supported by the SPIE – The International Society for Optics and Photonics by publications of their works in the series Proc. SPIE. The conference gathers usually around 150 participants and around 100 technical presentations. XVIIth conference on “Optical Fibres and Their Applications – OFTA 2017”, organized by Technical University of Białystok, was held in January 2017, and gathered similar number of persons and high quality papers. Topical area of the conference, which may be concisely determined as optical fibre photonics, embraced technology of active and passive optical fibres, active components cooperating with optical fibres as sources and detectors, optical fibre functional components, optical fibre sensors, optical fibre devices, circuits and systems – sensing, photonic signal processing, networked, and transmission. The article presents concisely a digest of chosen research and technical works presented during the XVIIth Conference on Optical Fibres and Their Applications.

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Active optical fibres for application in laser and broadband ASE sources

Dorosz D., Dorosz J., Zając A., Żmojda J., Kochanowicz M.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2012

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Vol. 60, nr 4

673-682

EN

The article brings into focus the present state of technology employing active fibres doped with rare earth (RE) ions for applications requiring power supply of several dozen watts and broadband ASE sources. Current trends in development of glasses and in construction of active fibres used in fibre sources of radiation within VIS-NIR range are presented. Technological constraints in the doping of fibre core glasses are discussed, with particular consideration of optimal RE concentration for technical applications. Characteristics of glasses are offered, and the glasses are used for manufacturing optical fibres with luminescence within the visible as well as near- and mid-infrared ranges. Also, requirements and luminescence properties concerning glasses co-doped with e.g. Nd3+/Yb3+,Tm3+/Ho3+ and Yb3+/Tb3+ are discussed. Results of research on the impact of technological parameters of glass matrices on luminescence properties of core glasses and optical fibres are quoted. For the doped glasses of which luminescence in a wide spectral range is desired, conditions for their processing into optical fibre systems are mentioned. Additionally, the impact of phonon energy in the glass on producing emission in a specified spectral range is analyzed. Furthermore, the article presents directions of technological studies to solve problems persisting in the phase of glass matrix design, as well as in determining the influence of fibre drawing process on the luminescence properties of core glasses and optical fibres, confirming the differences in luminescence stemming from the drawing process. Finally, some original designs of core glasses and active multicore fibre systems devised for construction of fibre radiation sources are presented.