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  • 1
    Language: English
    In: Applied Surface Science, 2009, Vol.255(10), pp.5519-5522
    Description: For many applications, optical multimode fibers are used for the transmission of powerful laser radiation. High light throughput and damage resistance are desirable. Laser-induced breakdown at the end faces of fibers can limit their performance. Therefore, the determination of laser-induced damage thresholds (LIDT) at the surface of fibers is essential. Nanosecond (1064 nm and 532 nm wavelength) single-shot LIDT were measured according to the relevant standard on SiO glass preforms (Suprasil F300) as basic materials of the corresponding fibers. For 10 kinds of fused silica fibers (FiberTech) with core diameters between 180 μm and 600 μm, an illumination approach utilizing a stepwise increase of the laser fluence on a single spot was used. For both wavelengths, the LIDT values (0% damage probability) obtained by means of the two methods were compared. The influence of surface preparation (polishing) on damage resistance was investigated. For equal surface finishing, a correlation between drawing speed of the fibers and their surface LIDT values was found. In addition to the surface measurements, bulk LIDT were determined for the preform material.
    Keywords: Fiber Waveguides (42.81.Qb) ; Physical Radiation Damage (61.80.−X) ; Laser-Beam Impact Phenomena (79.20.Ds) ; Glasses (81.05.Kf) ; Radiation Treatment (81.40.Wx) ; Engineering
    ISSN: 0169-4332
    E-ISSN: 1873-5584
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  • 2
    Language: English
    In: Applied Surface Science, 2007, Vol.254(4), pp.1096-1100
    Description: Optical multimode fibers are applied in materials processing (e.g. automotive industry), defense, aviation technology, medicine and biotechnology. One challenging task concerning the production of multimode fibers is the enhancement of laser-induced damage thresholds. A higher damage threshold enables a higher transmitted average power at a given fiber diameter or the same power inside a thinner fiber to obtain smaller focus spots. In principle, different material parameters affect the damage threshold. Besides the quality of the preform bulk material itself, the drawing process during the production of the fiber and the preparation of the fiber end surfaces influence the resistance. Therefore, the change of the laser-induced damage threshold of preform materials was investigated in dependence on a varying thermal treatment and preparation procedure. Single and multi-pulse laser-induced damage thresholds of preforms (F300, Heraeus) were measured using a Q-switched Nd:YAG laser at 1064 nm wavelength emitting pulses with a duration of 15 ns, a pulse energy of 12 mJ and a repetition rate of 10 Hz. The temporal and spatial shape of the laser pulses were controlled accurately. Laser-induced damage thresholds in a range from 150 J cm to 350 J cm were determined depending on the number of pulses applied to the same spot, the thermal history and the polishing quality of the samples, respectively.
    Keywords: Laser Ablation ; Optical Fibers ; Physical Radiation Damage ; Radiation Treatment ; Glass Transitions ; Glasses ; Engineering
    ISSN: 0169-4332
    E-ISSN: 1873-5584
    Library Location Call Number Volume/Issue/Year Availability
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