Ce-doped LuAG single-crystal fibers grown from the melt for high-energy physics

Xiaodong Xu (1) , Kheirreddine Lebbou (1) , Federico Moretti (1) , K. Pauwels (1, 2) , P. Lecoq (2) , E. Auffray (2) , Christophe Dujardin (1)

1 ILM - Institut Lumière Matière [Villeurbanne]
2 CERN - European Organization for Nuclear Research

Under a stationary stable regime undoped and Ce-doped LuAG (Lu3Al5O12) single-crystal fibers were grown by a micro-pulling-down technique. The meniscus length corresponding to the equilibrium state was <200 μm. Fluctuations in the fiber composition and pulling rate were found to have a significant effect on the properties of the fibers grown. A great improvement in the performance was found in samples containing low Ce concentrations (⩽0.1 at.%) and produced using pulling rates <0.5 mm min−1. Under such conditions a good lateral surface fiber quality was obtained and light propagation was significantly improved. Conversely, a high Ce concentration and a high pulling rate resulted in a strong degradation of the fiber surface quality causing defects to appear and a decrease in light output.

Domaines: Chimie; Physique [physics]; Sciences de l'ingénieur [physics]

Xiaodong Xu, Kheirreddine Lebbou, Federico Moretti, K. Pauwels, P. Lecoq, et al.. Ce-doped LuAG single-crystal fibers grown from the melt for high-energy physics. Acta Materialia, 2014, 67, pp.232-238. ⟨10.1016/j.actamat.2013.12.040⟩. ⟨hal-02309440⟩