185 research outputs found
Optical properties of Yb(3+) doped Lu(3)Al(5)O(12) crystal fibers grown by mu-pulling down technique
No full textEffect of Electron Traps on Scintillation of Praseodymium Activated Lu3Al5O12
No full textIn this paper we present the studies performed on a set of Lu3Al5O12:Pr (LuAG:Pr) crystals with praseodymium concentration between 1.5 and 10%, grown by the micro-pulling-down (muPD) technique. The research comprises the measurements of X-ray excited emission spectra and 137Cs gamma-ray pulse height spectra in a range from 78 to 600 K, and thermoluminescence glow curves. Based on experimental data we discuss the dependence of scintillation properties of Lu3Al5O12:Pr on praseodymium content and temperature. The main attention is focused on a distinct increase of scintillation yield with temperature, which we attribute to existence of shallow electron traps and their temperature-dependent contribution to scintillation of LuAG:Pr. An active role of traps is demonstrated by a novel experiment combining X-ray and laser excitation.Radiation, Radionuclides and ReactorsApplied Science
Growth and characterization of LiF single crystal fibers
No full textSingle crystal LiF fibers have been grown by the micro-pulling-down (μ-PD) technique. The fibers are 0.6 mm in diameter and 100 mm in length and of good optical quality. We describe the experimental apparatus for growth and analyze the sample structure and its spectroscopic characteristics
Growth and spectroscopic properties of Er:YAG crystalline fibers
No full text(YAG) single-crystal fibers doped with Erbium have been grown by means of the micro-pulling-down (-PD) technique and their structural and optical properties have been studied. The crystals were characterized by means of XRD, XRC, EPMA and spectroscopic analysis. Dopant uniformity was demonstrated and the spectroscopic features were compared to those of bulk crystals
Optical and scintillation properties of Ce3+ doped YAlO3 crystal fibers grown by mu-pulling down technique
No full textWe have grown single YAlO3 crystal fibers using the so-called V-pulling down technique for scintillation applications. Good quality un-doped and Ce-doped crystal fibers with diameters in the range 0.3-2.5mm and length up to 150mm have been grown. A first structural, spectroscopic and scintillation characterization will be presented. (C) 2007 Elsevier B.V. All rights reserved
First characterization of Silicon crystalline fibers produced with the micro-pulling technique for future gravitational wave detectors
No full textThe design of the gravitational wave interferometric detectors of third generation is under way. An overall improvement of the detector performance can be obtained by reducing a few noise sources, such as seismic noise, shot noise, and most importantly thermal noise. We report here on the design and fabrication of low thermal-noise suspensions made of a new material presently under investigation. An ad hoc technique to produce crystalline silicon fibers has been developed; the first measurements of the fiber mechanical and thermal properties at room temperature have been performed and interpreted. Preliminary measurements of the mechanical losses at low temperature are also discussed
First characterization of silicon crystalline fibers produced with the mu-pulling technique for future gravitational wave detectors
No full textThe design of the gravitational wave interferometric detectors of third generation is under way. An overall improvement of the detector performance can be obtained by reducing a few noise sources, such as seismic noise, shot noise, and most importantly thermal noise. We report here on the design and fabrication of low thermal-noise suspensions made of a new material presently under investigation. An ad hoc technique to produce crystalline silicon fibers has been developed; the first measurements of the fiber mechanical and thermal properties at room temperature have been performed and interpreted. Preliminary measurements of the mechanical losses at low temperature are also discussed. (c) 2006 American Institute of Physics
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