Stimulated Raman Spectroscopy As a Probe of Silica Network Distortion Due to the Rare-Earth Ion Inclusion Or Formation of Photoinduced Color Centers in an Optical Fiber Core

1996 ◽  
Author(s):  
V.V. Solovjov ◽  
I.V. Alexandrov ◽  
Z.V. Nesterova ◽  
G.T. Petrovskii ◽  
D.A. Nolan
Keyword(s):  
Raman Spectroscopy ◽  
Rare Earth ◽  
Optical Fiber ◽  
Color Centers ◽  
Silica Network ◽  
Rare Earth Ion ◽  
Fiber Core ◽  
Stimulated Raman ◽  
The Rare Earth

Internal Friction Study of the Rare Earth Ion Substituted Fast Oxide-Ion Conductors (La1-ΧreΧ)2Mo2O9 (Re=Nd, Gd)

2012 ◽  
Vol 184 ◽  
pp. 110-115
Author(s):  
X.P. Wang ◽  
J. Hu ◽  
Zhong Zhuang ◽  
Tao Zhang ◽  
Qian Feng Fang
Keyword(s):  
Phase Transition ◽  
Rare Earth ◽  
Internal Friction ◽  
Diffusion Processes ◽  
Rare Earth Ion ◽  
Disorder Transition ◽  
Oxide Ion Conductors ◽  
Oxide Ion ◽  
The Rare Earth ◽  
Ion Conductors

The relaxation and phase transition behaviors of rare-earth ion substituted fast oxide-ion conductors (La1-xRex)2Mo2O9 (Re=Nd, Gd) were investigated by internal friction (IF) measurement in the temperature range 300 K - 950 K. Three different IF peaks (labeled as PL, PH, and PG, respectively) were observed in the rare-earth ion doped La2Mo2O9 samples. Peak PL corresponds to short diffusion processes of oxygen ions among different oxygen vacancy sites. Peak PH is associated with the static/dynamic disorder transition in oxygen ion distribution. Peak PG is a newly discovered peak embodying phase transition-like characteristics and is suggested to be related to order-disorder transition associated with the rearrangement of La/ Re sub-lattice.

THE EFFECT OF BETA-DECAY ON THE EXCHANGE PROPERTIES OF THE RARE EARTH–EDTA COMPLEX IONS

1961 ◽  
Vol 39 (5) ◽  
pp. 1049-1053 ◽  
Author(s):  
P. Glentworth ◽  
R. H. Betts
Keyword(s):  
Rare Earth ◽  
Metal Ion ◽  
Chemical Reactivity ◽  
Sudden Change ◽  
Chelating Agent ◽  
Beta Particle ◽  
Central Metal ◽  
Complex Ions ◽  
Rare Earth Ion ◽  
The Rare Earth

It is shown that the rare earth ion Yb3+ is very resistant towards ordinary thermal exchange when it is complexed with the chelating agent EDTA in aqueous solution. However, when the complexed rare earth atom, as the 1.8-h Yb-177, emits a beta-particle, the daughter atom Lu-177 escapes readily from the chelate structure. Nuclear recoil arising from the beta-particle emission is shown not to be the cause of the escape of the daughter atom. It is suggested that the observed lability of the daughter atom is a result of a high degree of chemical reactivity of the chelate ion arising from the sudden change in atomic number of the central metal ion of the chelate structure.

scholarly journals Instrumentation for Simultaneous Non-Destructive Profiling of Refractive Index and Rare-Earth-Ion Distributions in Optical Fiber Preforms

Instruments ◽  
2018 ◽  
Vol 2 (4) ◽  
pp. 23 ◽  
Author(s):  
Marilena Vivona ◽  
Michalis Zervas
Keyword(s):  
Refractive Index ◽  
Rare Earth ◽  
Optical Fiber ◽  
Communication Systems ◽  
Optical Tomography ◽  
Dopant Distribution ◽  
Fiber Preform ◽  
Rare Earth Ion ◽  
Non Destructive ◽  
Fiber Preforms

We present a non-destructive technique for a combined evaluation of refractive index and active-dopant distribution in the same position along a rare-earth-doped optical fiber preform. The method relies on luminescence measurements, analyzed through an optical tomography technique, to define the active dopant distribution and ray-deflection measurements to calculate the refractive index profile. The concurrent evaluation of both the preform refractive index and the active dopant profiles allows for an accurate establishment of the dopant distribution within the optical core region. This combined information is important for the optimization and development of a range of advanced fibers, used, for example, in a high-power fiber lasers and modern spatial-division-multiplexing optical communication systems. In addition, the non-destructive nature allows the technique to be used to identify the most appropriate preform segment, thus increasing fiber yield and reducing development cycles. We demonstrate the technique on an Yb3+-doped aluminosilicate fiber preform and compare it with independent refractive index and active-dopant measurements. This technique will be useful for quality evaluation and optimization of optical fiber preforms and lends itself to advanced instrumentation.

Zeeman effect and stark splitting of the electronic states of the rare-earth ion in the paramagnetic terbium garnets Tb3Ga5O12 and Tb3Al5O12

2007 ◽  
Vol 49 (1) ◽  
pp. 91-98 ◽  
Author(s):  
U. V. Valiev ◽  
J. B. Gruber ◽  
D. K. Sardar ◽  
B. Zandi ◽  
I. S. Kachur ◽  
...  
Keyword(s):  
Rare Earth ◽  
Zeeman Effect ◽  
Electronic States ◽  
Rare Earth Ion ◽  
Stark Splitting ◽  
The Rare Earth
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