Enhancement of Cr4+ Concentration in Y3Al5O12 Crystal Fiber by Pregrowth Perimeter Deposition
Journal
Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Journal Volume
47
Journal Issue
8 PART 1
Pages
6369-6373
Date Issued
2008
Date
2008
Author(s)
Abstract
Chromium ions tend to diffuse outward during the laser-heated pedestal growth (LHPG) of Y3Al5O12 (YAG) crystal fiber, in which the average Cr4+ ion concentration decreases significantly after each diameter-reduction step. The Cr4+ ions are replenished using an electron gun to deposit Cr2O3 and divalent-ion oxide (CaO or MgO) on the source rod circumference before LHPG. It was observed that Ca2+ has better efficiency to diffuse into the source rod more efficiently than Mg2+ generating fewer defects and stacking faults. By CaO deposition and post growth annealing at 1350°C under an oxygen environment, a 110% increase in Cr4+ concentration was obtained. The achieved Cr4+ concentration and the ratio of Cr4+ to total Cr were 1.76 × 1018 cm-3 and 5.5, respectively. The Ca,Cr:YAG crystal fiber can thus be used as an ultra broadband laser material and amplified spontaneous emitter. © 2008 The Japan Society of Applied Physics.
Subjects
Cr4+:YAG; Crystal fiber; Deposition; Doping; Laser-heated pedestal growth
Other Subjects
Annealing; Calcium; Concentration (process); Crystal whiskers; Electrolysis; Electron beams; Electron guns; Electron tubes; Fibers; Ions; Lasers; Metal ions; Oxygen; Powders; Stacking faults; Chromium ions; Cr:yag crystals; Cr4+:YAG; Crystal fiber; Crystal fibers; Doping; Ion concentrations; Ion oxides; Oxygen environments; Pedestal growths; Reduction steps; Ultra broadbands; Chromium
Type
journal article
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