Fabrication of high-concentration rare-earth doped optical fibers using chelates

Influences of Yb3+ ion concentration on the spectroscopic properties of silica glass

“…Presently our group is carrying out investigations on Yb 3+ ions incorporation into silica glass preforms using solution doping [10] and chelate [11] deposition (MCVD) process. The quest for our study is to fabricate high quality Yb-doped silica glass preforms for large mode areaphotonic crystal fiber (LMA-PCF) in order to realize high laser output.…”

Doping of optical fiber preforms via porous silica layer infiltration with salt solutions

“…In another process proposed for rare-earth doping of preforms, use is made of rare-earth β -diketonate complexes [6,7]. These compounds have a sufficient vapor pressure at ~200°ë , which is well below their decomposition temperatures.…”

Optical Fiber Fabrication Using Novel Gas-Phase Deposition Technique

“…The starting material for fabricating the Yb-doped fiber was organometallic chelate tris(2,2,6,6-tetramethyl-3,5-heptanedionato)ytterbium, abbreviated to Yb(tmhd) 3 , with a purity of 99%. It has a melting point at around 168 ºC and a vapor pressure of around 1kPa at a temperature of 200ºC [6]. Preforms were fabricated using Heraeus F300-quality substrate measuring a nominal 20 mm outer x 16 mm inner diameters with the glassware arranged as depicted in Fig.…”

“…Lanthanide-based chelate complexes offer exciting opportunities to dope preforms with RE ions, in the gasphase, during core-layer deposition [6]. Their relatively high volatility means that sufficient vapor to achieve high dopant concentrations is possible at a moderately low temperature of around 150 -200 ºC [7].…”