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Une opportunité pour les lasers visibles : les cristaux à base d'oxyde activés par des ions Tb3+ ou Dy3+

Abstract : Visible lasers are useful in a variety range of fields. To date, the regime of high-quality visible lasers rely on the frequency conversion of Nd3+- or Yb3+-based infrared-emitting lasers. A new class of Ln3+-activated lasers operated directly with emission transitions in the visible spectral region has been developed recently, which do not feature the inconvenience of the traditional visible lasers, such as the inevitable energy loss during the frequency conversion process, and have promising research prospects. A challenge of this subject remains, up till now, to generate efficient laser emissions using Tb3+- or Dy3+-activated oxide-based gain materials. This PhD thesis concentrates on the fabrication and physical-property study of several selected Tb3+- or Dy3+-activated oxide-based single crystals: Ba3Tb(PO4)3, Sr3Tb(BO3)3, TbAl3(BO3)3, Li6Tb(BO3)3, Ca4TbO(BO3)3, KTb(WO4)2, Dy:CaYAlO4, Dy:Ca4YO(BO3)3, and Dy:Ca2AlSiO7. The conventional Czochralski technique was employed for the single-crystal preparation and the growth conditions were optimized. Single crystals of these compounds with good optical quality were obtained. Thermal properties of the Tb3+-based crystals were studied. The main effort was devoted to characterization of their optical properties, including the refractive index, absorption and emission spectrum, Judd-Ofelt parameters, fluorescence dynamic, and excited-state absorption. The transition cross-sections and upper-state lifetimes of the Tb3+-activated oxide crystals were found to be comparable to those of the fluorides. The Dy:CaYAlO4 crystal has better spectroscopic properties for yellow laser operation compared to the reported results of the Dy:YAG gain medium. Laser experiments were essayed using pump sources of blue-emitting semiconductor lasers.
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Hengjun Chen. Une opportunité pour les lasers visibles : les cristaux à base d'oxyde activés par des ions Tb3+ ou Dy3+. Chimie théorique et/ou physique. Université Paris sciences et lettres, 2018. Français. ⟨NNT : 2018PSLEC012⟩. ⟨tel-02860721⟩

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