Rare-Earth Doped Optical Fiber Fabrication Using Novel Gas Phase Deposition Technique

Optical Fiber Fabrication Using Novel Gas-Phase Deposition Technique

“…DCF was also drawn to a larger diameter of 400μm with 40μm core size and D-shaped inner cladding to test in high power laser configuration. The output power of the fiber reached 200 W for a launched pump power of just over 250 W [10]. We report a simplified and robust gas phase technique for manufacturing RE doped optical fiber.…”

Glass and Process Development for the Next Generation of Optical Fibers: A Review

“…An aluminosilicate fiber, which was in-situ doped with Yb, was successfully fabricated and exhibited a slope efficiency of 79%. Using this MCVD chemical-in-crucible technique, it is possible to heat the rare-earth precursor directly within the MCVD glassware on the lathe in close proximity to the deposition zone, which increases versatility while maintaining high doping uniformity along the preform length [16]. Due to the reasonable volatility of lanthanide-based chelate complexes in conjunction with MCVD, preforms can be doped with a high concentration of REs in the gas-phase at crucible temperatures of~200 • C. Because modifier ions (such as for example Al 2 O 3 and/or P 2 O 5 ) can be incorporated simultaneously during the incorporation of the RE and silica, less rare-earth clustering occurs during the core processing when compared with solution-doping for an equivalent doping level [17].…”

Yb-doped LMA Fiber Fabricated by Chelate Deposition System for High Power Laser Applications

“…Solution doping technique (SDT) is a tradit ional well-known method for many years, but was found to limit RE concentration, induced RIP v ibration, ion clustering and other shortcomings, which limits its applicat ion in h igh power fiber laser development. In contrast, chelate doping system/technique (CDS), one of the main vapor doping techniques, is based on high-temperature sublimat ion of organic rare-earth precursor fro m solids , offering potential opportunities to dope preform with RE ion with high concentration, less ion clustering and decreased photodarkening effect [6][7][8].…”

“…1: SDT preform core is like ice -splitting, while CDS preform core is homogeneous without any clustering effect. CDS assisted MCVD processes are as follows [6][7][8]: Cladding deposition was followed by active core deposition using chelate doping system; Volatized precursors were transported and injected into reaction hot zone by a system of heated conduits, high -temperature rotary seal and sliding injection tube; Inert gas was used as carrier to prevent chemical react ion between constituents and then mix with o xygen and SiCl 4 , GeCl 4 , POCl 3 , BBr 3 and fluorine containing gas delivered fro m standard MCVD gas cabinet only in the hot zone. After deposition of core layers, substrate tube was collapsed into solid rod preform in the conventional MCVD way.…”