The fabrication, assessment and optical properties of high-concentration Nd3+- and Er3+-doped silica-based fibres

Chromium-doped silica optical fibres: influence of the core composition on the Cr oxidation states and crystal field

“…The distortion of the perfect tetrahedral symetry partially lifts the degeneracy of some energy levels such as 3 T 1 ( 3 F) and causes the presence of several peaks assigned to one transition. The Cr(Al) absorption spectrum is similar to those observed in aluminate [7] and alumino-silicate glasses [8] [18,19].…”

Effect of core glass composition on the optical properties of active fibers

“…work, leading to the formation of anions, which surround rare-earth ions, thereby lowering the free energy of the rare-earth solution and raising the solubility of the activator in silica glass [7][8][9][10][11][12].…”

Contributed Review: A review of the investigation of rare-earth dopant profiles in optical fibers

“…11 In addition, the confinement of dopants in fiber preforms has been examined using the electron probe microanalysis (EPMA) method and its counterpart systems. 19,20 In other cases, optical means such as fluorescence-induced laser scanning microscopy (LSM) or micro-fluorescence profiling have been utilized. 21 It is import to note that in most of the published literature, there is at best modest detail regarding the particulars of the profiling measurements made such as the relevant physical parameters and/or the conditions under which the investigation of the dopant distributions was made (see, for example, Refs.…”