All-glass high NA Yb-doped double-clad laser fibres made by outside-vapour deposition

Wang, J.; Walton, Donnell T.; Zenteno, L.A.

doi:10.1049/el:20040427

Cited by 16 publications

(7 citation statements)

References 3 publications

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“…High-power laser fibers are mostly prepared by modified chemical vapor deposition (MCVD) and solution doping within a carrier tube, see e.g. [6], but other preparation routes as outside vapor deposition [7], direct nanoparticle deposition [8] and sintering/ melting techniques [9] are also under development.…”

Section: Introductionmentioning

confidence: 99%

Materials for high-power fiber lasers

Kirchhof¹,

Unger²,

Schwuchow³

et al. 2006

Journal of Non-Crystalline Solids

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Section: Introductionmentioning

confidence: 99%

Materials for high-power fiber lasers

Kirchhof¹,

Unger²,

Schwuchow³

et al. 2006

Journal of Non-Crystalline Solids

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“…As explained below, for some laser fiber types, the concentration variation of RE is without importance, in other cases however, this effect can be limiting, especially because during the total process of preform preparation no intermediate control of the reached concentration values is possible. Besides the MCVD, at least two fiber fabricators use another method (OVD 19 and a variant of OVD, the so called DND, direct nanoparticle deposition 20 ), which are gase phase methods both concerning the deposition of the silica glass matrix A new method is currently developed for the preparation of rare earth doped quartz glasses materials for high power fiber lasers, together with Heraeus Quarzglas GmbH & Co.KG. It consists of a combination of solution doping with sintering and melting procedures.…”

Section: Materials and Preparation Methods For Rare Earth Doped Compomentioning

confidence: 99%

Materials and technologies for microstructured high power laser fibers

et al. 2005

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In the last years rare earth doped double-clad fibers have been developed to high-power laser sources. Important progress was possible by increasing numerical aperture of the pump cladding and decreasing numerical aperture of the laser core. The high NA of the pump cladding enables the acceptance of large pump intensities whereas the low NA of the laser core makes possible to increase the core diameter and to decrease the laser power density retaining high beam quality. Here, actual challanges are discussed and possibilities are demonstrated to use microstructures for improved fiber designs which are realized by stacking and drawing of capillaries and rods. The rare earth doped parts are prepared by modified chemical vapor deposition and solution doping, but other routes of powder technology are also studied. Concerning the currently most important laser and amplifier types -Yb doped at 1.1 : m wavelength and Er/Yb doped at 1.55 : m wavelength -, the question of a high pump aperture is similar, but the limitations concerning a low core aperture are fairly different, because an efficient Er/Yb laser demands high phosphorus co-doping which naturally increases the core NA. The applied microstructures comprise "holey" fiber cross sections in form of "air clads" for the pump light and multiple hole ring structures for laser core and inner cladding. Moreover, microstructured cores made from solid parts yield new possibilities and parameters to compensate the high refractive index of the active material and to optimize the large mode area design. key words: fiber laser, rare-earth doping, microstructured fiber

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“…A lot of processes utilizing MCVD, outside vapor-phase deposition (OVD), or vapor-phase axial deposition (VAD) methods have been proposed. In these methods, using RE raw materials and co-dopants as aerosol, or vapor, has been proposed, and the methods have been developed to produce preforms with the required Yb concentration and desirable refractive index profile [11][12][13][14][15][16][17]. This paper presents recent improvement in our MCVD system, using relatively low vapor pressure compounds in order to produce Yb-and Al-doped silica preforms.…”

Section: Introductionmentioning

confidence: 99%