WO CERAMIC PROCESSES IN COMPARISON FOR THE PRODUCTION OF LAYERED LASER CERAMICS (Comunicazione a convegno)

Type
Label
  • WO CERAMIC PROCESSES IN COMPARISON FOR THE PRODUCTION OF LAYERED LASER CERAMICS (Comunicazione a convegno) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Alternative label
  • Laura Esposito, Jan Hosta?a, Andreana Piancastelli, Matteo Vannini, Guido Toci (2014)
    WO CERAMIC PROCESSES IN COMPARISON FOR THE PRODUCTION OF LAYERED LASER CERAMICS
    in 1oth Laser Ceramic Symposium, Wroklaw Polonia, 1-5/12/2014
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Laura Esposito, Jan Hosta?a, Andreana Piancastelli, Matteo Vannini, Guido Toci (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR ISTEC, CNR INO (literal)
Titolo
  • WO CERAMIC PROCESSES IN COMPARISON FOR THE PRODUCTION OF LAYERED LASER CERAMICS (literal)
Abstract
  • The most interesting applications for laser ceramics are high power systems, in particular the laser-driven inertial confinement fusion, that is considered one of the most promising energy source of the future. Among the possible laser sources, ceramics play a key role as also shown by the European HiPER project, the DIPOLE and LUCIA programs that rely solely on large ceramic sources [1]. One of the key aspects for producing high power laser sources and amplifiers based on ceramic active media is the management of the thermal effects (TEs) and thermomechanical effects (TMEs) (e.g. thermal lensing, stress-induced depolarization, surface deformations) deriving from the laser pumping process[2,3], which degrade the performance of the laser source and can eventually lead to a catastrophic failure of the laser active element.. The present work focusses on possible ways to control TEs and TMEs by exploiting the flexibility of the ceramic process and open the path for building of structures modelled to respond to specific application. Two processing techniques to prepare layered structures with a tailored modulation of the doping level are presented, with the goal of reducing the peak temperature, the temperature gradients and also the thermally-induced deformation of the laser material, thus mitigating the overall thermal effects. Tape casting in combination with thermal compression of ceramic tapes with a varying doping level is one of the presented techniques. To make this process as adaptable as possible, commercial micrometric ceramic powders have been used. The results are compared with those obtained using nanometric powders and a shaping process based on the subsequent pressing of spray dried powders with a different doping level. The study focusses on YAG (Y3Al5O12) based components doped with Yb3+ as lasing ion. The microstructure and the Yb diffusion profile across the doped/undoped interfaces have been characterized by FEG, SEM and ESEM. Laser performance has been characterized in a longitudinally diode pumped laser cavity. The laser efficiency under high thermal load conditions has been compared to that obtained from samples with uniform doping, and for samples obtained with press shaping and tape casting, under the same conditions. Thermal effects (thermal lensing, thermal depolarization, beam quality degradation) were characterized under laser operation. (literal)
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