Influence of aluminum on doping of ytterbium in optical fiber synthesized by vapor phase technique

Saha, Maitreyee; Pal, Anand; Pal, Mrinmay; Sen, Ranjan

doi:10.1016/j.optcom.2014.07.070

Cited by 7 publications

(5 citation statements)

References 15 publications

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“…But from the experimental results, it is reveled that obtaining Yb concentrations close to the targeted value is not possible by pre-calculating the carrier gas flow rate only since RE precursors are much prone to decomposition and/or condensation and needs longer residential time to produce saturated vapors as compared to Al precursor. Further, the RE concentration also depends upon Al/RE ratios in the inlet gas mixture due to the co-operative mechanism [24]. Thus, linear variation of Yb concentration is practically not feasible without considering these points.…”

Section: ) Carrier Gas Flow Ratementioning

confidence: 99%

An Optimized Vapor Phase Doping Process to Fabricate Large Core Yb-Doped Fibers

Saha

Pal

et al. 2015

J. Lightwave Technol.

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The paper demonstrates a standardized process of vapor phase doping to fabricate large core Yb-doped preforms with longer useful length in reproducible manner. The optimization of the process led to successful achievement of Yb-doped core thickness of 4.5 mm (in 14.8 mm of preform diameter) by depositing up to 30 number of core layers with controlled amount of generated precursor vapors. The influence of the process parameters was studied rigorously to enhance the useful preform length up to 380 mm. A combination of Yb and Al in different proportions was doped into the core with uniform dopant concentration along the length by adjusting few process parameters efficiently. The Al 2 O 3 concentration up to the level of 17.8 mol% has been achieved successfully which resulted in NA of 0.31. This is the highest ever doping of Al in passive fibers by any modified chemical vapor deposition process. The Yb 2 O 3 content in the active fibers is as high as 0.47 mol%.

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Section: ) Carrier Gas Flow Ratementioning

confidence: 99%

An Optimized Vapor Phase Doping Process to Fabricate Large Core Yb-Doped Fibers

Saha

Pal

et al. 2015

J. Lightwave Technol.

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“…The solid precursor materials were heated at fixed temperatures of 140°C and 220°C for Al and Yb, respectively, and the generated vapors were delivered to the reaction zone by passing preheated Helium (He) carrier gas. He flow rate was regulated to deliver 1.67 mol% of AlCl3 and 1.11 mol% of Yb(thd)3 (with respect to inlet gas mixture) which had earlier resulted in ~7.1 and ~0.22 mol% of Al2O3 and Yb2O3, respectively, in a fabricated preform . All other process parameters were kept constant including SiCl 4 flow rate (0.58 g/min), carriage traversed speed (125 mm/min), total gas flow rate (1 L/min), ribbon burner temperatures (260 ± 10°C), etc.…”

Section: Methodsmentioning

confidence: 50%

“…He flow rate was regulated to deliver 1.67 mol% of AlCl3 and 1.11 mol% of Yb(thd)3 (with respect to inlet gas mixture) which had earlier resulted in~7.1 and~0.22 mol% of Al2O3 and Yb2O3, respectively, in a fabricated preform. 22 All other process parameters were kept constant including SiCl 4 flow rate (0.58 g/min), carriage traversed speed (125 mm/min), total gas flow rate (1 L/min), ribbon burner temperatures (260 AE 10°C), etc. In every run, 15 layers of soot particles were deposited by fixing the main burner traverse zone up to 50% length of the substrate tube.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and characterization of rare earth‐doped silica nanoparticles for optimizing vapor phase doping technique

Saha

Sen

2017

Int J of Appl Glass Sci

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The synthesis of rare earth‐doped aluminosilicate soot particles through vapor phase doping technique has been systematically investigated to achieve better control of rare earth homogeneity in silica glass. The experiments were designed to establish the correlation of process conditions with the physicochemical properties of the formed soot particles. Attained results depict that the characteristics of soot particles are much dependent on vapor phase compositions as well as the deposition temperature. Doping of alumina/rare earth oxide into silica matrix lowers the viscosity of the glass material at a level where size of soot particles becomes independent of deposition temperature. But dopant concentration in the formed soot samples moderately depends on the main burner temperature and by altering it appropriately one can eliminate soot layer sintering step. The paper also reports on the optimum conditions which are necessary to produce rare earth‐doped preforms of better homogeneity and thus, assist in achieving greater control over the process technology of vapor phase doping. As per the authors’ knowledge, this investigation presents completely new findings which have not been reported by any other research group earlier.

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“…In approach C, keeping the flow fixed for O 2 /SiCl 4 and He/Yb(thd) 3 while varying only He/AlCl 3 flow rate to achieve the graded profile is attributed to co‐operative phenomena, which was previously observed and reported both for the MCVD‐SD technique and the VPCD technique . The adjustment of He/AlCl 3 flow rate over the passes during fabrication of the preform core is critical to avoid clustering effect for a particular Yb 2 O 3 concentration.…”

Section: Resultsmentioning

confidence: 90%

Graded‐Index Ytterbium‐Doped Optical Fiber Fabricated through Vapor Phase Chelate Delivery Technique

Choudhury

Shekhar

Dhar

et al. 2019

Physica Status Solidi (a)

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Herein, the fabrication of ytterbium‐doped graded refractive‐index few‐mode fiber (GRIN‐FMF) is described for the first time following a vapor phase chelate delivery technique. Investigation is carried out to find out the best possible approach to fabricate the preform. The optimization of the process steps along with composition and associated process parameters leads to a parabolic refractive‐index profile with a profile parameter of 2 in the developed fiber. A large core of 30 μm diameter and a low numerical aperture (NA) of 0.08 with graded distribution of dopant ions is achieved with a good repeatability. Amplification gain of more than 20 dB with good beam quality for pulses with kW peak power without any distortion in temporal, spectral, and spatial profile proves the potential of the fiber for many promising applications.

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Influence of aluminum on doping of ytterbium in optical fiber synthesized by vapor phase technique

Cited by 7 publications

References 15 publications

An Optimized Vapor Phase Doping Process to Fabricate Large Core Yb-Doped Fibers

An Optimized Vapor Phase Doping Process to Fabricate Large Core Yb-Doped Fibers

Synthesis and characterization of rare earth‐doped silica nanoparticles for optimizing vapor phase doping technique

Graded‐Index Ytterbium‐Doped Optical Fiber Fabricated through Vapor Phase Chelate Delivery Technique

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