Ytterbium-doped large-mode-area silica fiber fabricated by using chelate precursor doping technique

Shi, Tao; Zhou, Zhiguang; Li, Ni; Xiao, Xusheng; Zhan, Hongbing; Zhang, Aidong; Lin, Aoxiang

doi:10.1364/ao.53.003191

Cited by 23 publications

(15 citation statements)

References 22 publications

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“…Substrate tubes with larger than usual outer diameter and thin wall (30/27 or 25/22 mm) is used to permit vapor injection tube to slide into hot zone area which then oxidized as per the usual manner. This system does not require any ribbon burner for flowing of the dopant precursors up to the reaction zone . Although in case of IDS, the dopant chamber is positioned in close proximity to the reaction zone for avoiding condensation of precursor during transportation, it eventually suffers from poor thermal management for accurately maintaining the temperature above 800 °C.…”

Section: Evolution Of the Process Technologymentioning

confidence: 99%

Vapor phase doping process for fabrication of rare earth doped optical fibers: Current status and future opportunities

Saha

Sen

2016

Physica Status Solidi (a)

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Emerging application of rare-earth (RE) doped optical fibers in high power lasers requires preforms with stringent geometrical and optical properties. This in turn demands more versatile and reliable process technology which brought Vapor Phase Doping (VPD) into prominence. This technology has immense potential to overcome fiber fabrication related challenges viz, dopant-rich phase separation, RE uniformity in radial as well as longitudinal direction, "star-like" defect elimination from core-clad boundary and refractive index (RI) adjustment which results in improved beam quality and power stability of fiber laser. Further, high power lasers demand LMA active fibers with large core diameter and low numerical aperture (NA) which is easily producible by VPD method as it permits deposition of multiple RE doped core layers in a reproducible "in situ" manner. So, the prime focus is to optimize process technology to produce low RI, large core fibers. This article gives an overview of the comprehensive effort made by the global researchers to overcome challenges of VPD method and to demonstrate a standardized process technology for RE doping in silica glass preform.

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Section: Evolution Of the Process Technologymentioning

confidence: 99%

Vapor phase doping process for fabrication of rare earth doped optical fibers: Current status and future opportunities

Saha

Sen

2016

Physica Status Solidi (a)

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“…Although researchers at the University of Southampton [9] lately reported that they had prepared the LMA fiber with the core diameter of 40 μm and the NA of the core is reduced to 0.038 by MCVD method combined with solution doping, it is very difficult to control the doping homogeneity especially when the P 2 O 5 is co-doped. Researchers [21] at the Xi'an Institute of Optics and Precision Mechanics recently reported that they can prepare large size Yb 3+ -doped silica glass rod (∅ 4.4 mm) using chelate precursor doping technique of MCVD method. However, the doping homogeneity is still not very good.…”

Section: Introductionmentioning

confidence: 99%

“…However, the doping homogeneity is still not very good. In most cases, the smallest index step that can be precisely obtained by applying MCVD fiber perform fabrication technology is about 0.06 [8,21]. The NA of the core 0.06 allows for an increase in the single-mode core diameters to ~15 μm in the 1 μm wavelength region, and further enlargement of the core dimensions causes multi-mode laser transmission [22].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic and laser properties of Al-P co-doped Yb silica fiber core-glass rod and large mode area fiber prepared by sol-gel method

Wang¹,

Xu²,

Lou³

et al. 2015

Opt. Mater. Express

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A large-size (∅5 mm) Yb 3+-doped silica fiber core-glass rod with an Al-P co-doped composition: 0.035Yb 2 O 3-1.0Al 2 O 3-1.0P 2 O 5-97.965SiO 2 (mol%) was prepared by the sol-gel method combined with high-temperature melting technology. We successfully solved the doping homogeneity problem caused by the volatility of P 2 O 5. The doping homogeneity of the glass rod was very high with the maximum refractive index fluctuation Δn < 2 × 10 −4. The refractive index of the glass rod was very low because of the equimolar amounts of Al and P co-doping, which yielded an AlPO 4 structure. A large-mode-area single cladding fiber (LMA SCF) and photonic crystal fiber (LMA PCF) with core diameters of 35 and 50 µm, respectively, were drawn from this glass rod. Owing to the low refractive index of the core-glass rod and the corresponding low numerical aperture (NA, 0.033) of the core, the LMA SCF exhibited a high laser beam brightness with M 2 = 1.3-1.4. The LMA PCF exhibited the maximum output power, which was limited by the available pumping power, of 46 W and the slope efficiency of 61%.

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“…Subsequently, more improvements in the fabrication of rare earth doped fibers using MCVD-chelate system have been reported [7]- [13]. A typical MCVD and chelate vapor system consists of a standard MCVD -with precursors like SiCl 4 , GeCl 4 , POCl 3 , BBr 3 , SF 6 , and CF 4 -and a thermal evaporation system -with metal organic precursors -utilizing heated delivery line.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Tm<inf>2</inf>O<inf>3</inf>/Al<inf>2</inf>O<inf>3</inf>-silica preform by improved MCVD-chelate delivery system

Mat-Sharif

Omar

Hanif

et al. 2014

2014 IEEE 5th International Conference on Photonics (ICP)

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The fabrication of Tm/Al-doped silica preforms by an improved MCVD method with metal chelate precursors is discussed. Two fabrication techniques are employed, namely; simultaneous soot-dopant deposition (or standard MCVD) and stepwise soot-dopant deposition. The preforms are characterized by refractive index profiler and EPMA. The results show that the stepwise soot-dopant technique has a higher incorporation of Al2O3 and Tm2O3 as compared to the simultaneous soot-dopant method. This is due to the drawbacks of our chelate delivery system such as the temperature gradient and flow design. For the stepwise technique, the measured index difference of the preform is 0.006 with 0.8 wt% (maximum) Tm incorporated in the core.Index Terms-MCVD; metal chelate; rare earth doped silica; EPMA; refractive index

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Ytterbium-doped large-mode-area silica fiber fabricated by using chelate precursor doping technique

Cited by 23 publications

References 22 publications

Vapor phase doping process for fabrication of rare earth doped optical fibers: Current status and future opportunities

Vapor phase doping process for fabrication of rare earth doped optical fibers: Current status and future opportunities

Spectroscopic and laser properties of Al-P co-doped Yb silica fiber core-glass rod and large mode area fiber prepared by sol-gel method

Fabrication of Tm<inf>2</inf>O<inf>3</inf>/Al<inf>2</inf>O<inf>3</inf>-silica preform by improved MCVD-chelate delivery system

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