A novel technique for active fibre production

Renner-Erny, R; Labio, Loredana Di; Lüthy, W.

doi:10.1016/j.optmat.2006.02.004

Cited by 30 publications

(25 citation statements)

References 2 publications

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“…52 Briefly, the new manufacturing method consists in filling fiber preforms with a mix of granulated silica, alumina, and oxides of the dopants and drawing afterwards the filled tubes to fibers in a standard drawing tower. The granulates can be treated by melting them with a CO 2 laser in order to minimize the contamination.…”

Section: Applicationmentioning

confidence: 99%

Laboratory-based micro-X-ray fluorescence setup using a von Hamos crystal spectrometer and a focused beam X-ray tube

Kayser

Błachucki

Dousse

et al. 2014

Review of Scientific Instruments

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The high-resolution von Hamos bent crystal spectrometer of the University of Fribourg was upgraded with a focused X-ray beam source with the aim of performing micro-sized X-ray fluorescence (XRF) measurements in the laboratory. The focused X-ray beam source integrates a collimating optics mounted on a low-power micro-spot X-ray tube and a focusing polycapillary half-lens placed in front of the sample. The performances of the setup were probed in terms of spatial and energy resolution. In particular, the fluorescence intensity and energy resolution of the von Hamos spectrometer equipped with the novel micro-focused X-ray source and a standard high-power water-cooled X-ray tube were compared. The XRF analysis capability of the new setup was assessed by measuring the dopant distribution within the core of Er-doped SiO 2 optical fibers.

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Section: Applicationmentioning

confidence: 99%

Laboratory-based micro-X-ray fluorescence setup using a von Hamos crystal spectrometer and a focused beam X-ray tube

Kayser

Błachucki

Dousse

et al. 2014

Review of Scientific Instruments

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“…The second way for material fabrication is the application of the so called REPUSIL technology [16]. For nonlinear applications Al 2 O 3 / La 2 O 3 doped silica powders have been fabricated and vitrified directly during fiber drawing by the granulate-in-tube (GIT) method [17].…”

Section: Glass Preparationmentioning

confidence: 99%

Structured material combined HMO-silica fibers: preparation, optical and mechanical behavior

et al. 2011

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We report about preparation technique and characterization of structured fibers composed of HMO core glasses and silica cladding. Two processes as material preparation techniques have been developed based on glasses prepared by melting of SAL (e.g. 70SiO 2 -20Al 2 O 3 -10La 2 O 3 ) glasses and the reactive powder sintering (REPUSIL) method. The melted glasses have been characterized by dilatometrical methods to find T g values of 827 -875 °C and expansion coefficients between 4.3 and 7.0 x 10 -6 K -1 . The latter is one order of magnitude higher than the expansion coefficient of pure silica glass. Structured fibers (SAL core, silica cladding) were fabricated following the Rod-in-Tube (RIT) and Granulate-in-Tube (GIT) process. The HMO glasses were chosen due du their high lanthanum content and the expected high nonlinearity, suitable for nonlinear applications (e.g. supercontinuum sources).The partial substitution of lanthanum by other rare earth elements (e.g. Ytterbium) allows the preparation of fibers with extremely high rare earth concentration up to 5 mol% Yb 2 O 3 . The concentration of alumina in the HMO glasses as "solubilizer" for lanthanide was adjusted to about 20 mol%. So we overcame the concentration limits of rare earth doping of MCVD (maximum ca. 2 mol% RE 2 O 3 ). Nevertheless, the investigated HMO glasses show their limits by integration in structured silica based fibers: Optical losses are typically in the dB/m range, best value of this work is about 600 dB/km.The mechanical stability of fibers is influenced by mechanical strain caused by the high thermal expansion of the core material and the lower network bonding stability of the HMO glasses, but partially compensated by the silica cladding.

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“…The fibers are drawn from preforms that are fabricated with granulated oxides [9,10,19]. In a first step the preform is assembled by closely stacking seven silica tubes of 3 mm × 5 mm diameter in the center of a bigger 17 mm × 21 mm silica tube and by filling the remaining space with undoped granulated silica of a typically 400 μm grain size as described in detail in [9,10]. Each inner tube is filled with a mixture of granulated silica, the appropriate concentration of rare earth oxide, and aluminum oxide.…”

Section: Fabrication Proceduresmentioning

confidence: 99%

“…Finally, the highest output power is reached with laser emission, but in continuous wave (cw) operation this comes at the cost of a bandwidth that is considerably reduced. Nevertheless, even in the case of cw laser activity, laser emission can cover a range of 50 nm in the case of an Nd 3þ ∶Al 3þ ∶ glass fiber [9,10] or 75 nm for a Yb 3þ ∶Al 3þ ∶ glass fiber [11]. The broadest bandwidths and the highest output powers, however, are undoubtedly reached with standalone mode-locked oscillators or with subsequent continuum generation at the expense of high costs.…”

Section: Introductionmentioning

confidence: 99%