The Experts below are selected from a list of 237 Experts worldwide ranked by ideXlab platform
Sumita Das - One of the best experts on this subject based on the ideXlab platform.
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Silicon Nano-Particles Doped Optical Fiber: Fabrication, Characterization, and Application
Journal of Lightwave Technology, 2013Co-Authors: Alexander V. Kir'yanov, Sumita Das, Mukul Chandra Paul, Yu. O. Barmenkov, A. M. Martinez-gamez, Mrinmay Pal, J. L. Lucio-martinez, A. Arredondo-santos, V. A. Kamynin, Victor G. PlotnichenkoAbstract:The Fabrication of a new-type of Silicon nanoparticles (Si-n/p) doped silica Fiber is reported. The method is entirely based on the MCVD process, with no solution-doping technique being required. The TEM, EPMA, EDX, and electron diffraction analyses as well as the Raman, Optical absorption, and fluorescence spectra’ measurements confirm the formation of Si-n/p in the Fiber. When pumped at 406 nm, this Fiber fluoresces mainly in the VIS to near-IR spectral range and the fluorescence shows a multi-peak spectral structure in several wide bands. As a consequence of the high nonlinearity $n_{2}$ of the Fiber, effective supercontinuum generation at 1.6- $\mu{\rm m}$ excitation by tens ns-range, kW-level pulses is demonstrated.
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Nano-engineered Yb2O3 doped Optical Fiber: Fabrication, material characterizations, spectroscopic properties and lasing characteristics: a review
Science of Advanced Materials, 2012Co-Authors: Mukul Chandra Paul, Sumita Das, Mrinmay Pal, Sandip Bysakh, Shyamal Kumar Bhadra, Seongwoo Yoo, A.j. Boyland, J K SahuAbstract:This review summarizes the very recent work on development of Yb2O3 doped nano-crystalline YAG in a silica based preforms made by modified chemical vapour deposition (MCVD)-solution doping technique and under suitable thermal annealing of the preforms for next generation of Optical Fiber devices. There is a great need to engineer the composition as well as doping levels of different elements within the core glass during the preform making stages to generate phase-separated Yb2O3 doped yttria-alumino rich silica nano particles, with or without crystalline in nature, in the fibre. The discussion concentrates on making of Yb2O3 doped yttria-alumino rich YAG nano-crystals containing silica glass based perform, drawing of Fibers containing phase-separated dielectric nano-particles along with material characterizations, study of spectroscopic properties, photo-darkening phenomena and lasing characteristics. Also, approaches that may be applied for the formation of yttria alumina rich phase-separated crystalline nano-particles and dielectric nano-particles within the preform and Fiber core region respectively are discussed in this review.
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A new codopant for rare earth doped Optical Fiber
International Conference on Fibre Optics and Photonics, 2012Co-Authors: Anirban Dhar, Atasi Pal, Sumita Das, Ranjan SenAbstract:Barium has been identified as a promising network-modifier, alternative to Al for rare-earth doping in Optical Fiber. Fabrication process has been established. Transmission and Optical property of Fiber indicates potential application in laser and amplifier.
J K Sahu - One of the best experts on this subject based on the ideXlab platform.
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Nano-engineered Yb2O3 doped Optical Fiber: Fabrication, material characterizations, spectroscopic properties and lasing characteristics: a review
Science of Advanced Materials, 2012Co-Authors: Mukul Chandra Paul, Sumita Das, Mrinmay Pal, Sandip Bysakh, Shyamal Kumar Bhadra, Seongwoo Yoo, A.j. Boyland, J K SahuAbstract:This review summarizes the very recent work on development of Yb2O3 doped nano-crystalline YAG in a silica based preforms made by modified chemical vapour deposition (MCVD)-solution doping technique and under suitable thermal annealing of the preforms for next generation of Optical Fiber devices. There is a great need to engineer the composition as well as doping levels of different elements within the core glass during the preform making stages to generate phase-separated Yb2O3 doped yttria-alumino rich silica nano particles, with or without crystalline in nature, in the fibre. The discussion concentrates on making of Yb2O3 doped yttria-alumino rich YAG nano-crystals containing silica glass based perform, drawing of Fibers containing phase-separated dielectric nano-particles along with material characterizations, study of spectroscopic properties, photo-darkening phenomena and lasing characteristics. Also, approaches that may be applied for the formation of yttria alumina rich phase-separated crystalline nano-particles and dielectric nano-particles within the preform and Fiber core region respectively are discussed in this review.
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Optical Fiber Fabrication using novel gas phase deposition technique
Journal of Lightwave Technology, 2011Co-Authors: A J Boyland, A S Webb, Francesca H Mountfort, M P Kalita, R J Standish, J K Sahu, D J Richardson, D N PayneAbstract:We report a highly versatile chemical-in-crucible preform Fabrication technique suitable for gas-phase deposition of doped Optical Fibers. Aluminosilicate and ytterbium-doped phosphosilicate Fibers are presented demonstrating the technique and its potential for realizing complex Fiber designs that are suitable for the next generation of high-power Fiber devices. The results show aluminum-doped Fiber with numerical aperture of 0.28 and ytterbium-doped Fiber with a measured slope efficiency of 84% with respect to pump launch power.
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Rare-earth doped Optical Fiber Fabrication using novel gas phase deposition technique
CLEO QELS: 2010 Laser Science to Photonic Applications, 2010Co-Authors: A J Boyland, A S Webb, M P Kalita, R J Standish, Christophe A. Codemard, Johan Nilsson, J K SahuAbstract:We report a highly versatile gas phase technique for making ytterbium doped silica Fibers. Initial results generated 200W output power with a slope efficiency of 72%.
V.r. Prasad - One of the best experts on this subject based on the ideXlab platform.
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Thermophoretic Hydromagnetic Dissipative Heat and Mass Transfer with Lateral Mass Flux, Heat Source, Ohmic Heating and Thermal Conductivity Effects: Network Simulation Numerical Study
Applied Thermal Engineering, 2009Co-Authors: Joaquín Zueco, O. Anwar Bég, H.s. Takhar, V.r. PrasadAbstract:A two-dimensional mathematical model is presented for the laminar heat and mass transfer of an electrically-conducting, heat generating/absorbing fluid past a perforated horizontal surface in the presence viscous and Joule (Ohmic) heating. The Talbot-Cheng-Scheffer-Willis formulation (1980) is used to introduce a thermophoretic coefficient into the concentration boundary layer equation. The governing partial differential equations are non-dimensionalized and transformed into a system of nonlinear ordinary differential similarity equations, in a single independent variable, . The resulting coupled, nonlinear equations are solved under appropriate transformed boundary conditions using the Network Simulation Method. Computations are performed for a wide range of the governing flow parameters, viz Prandtl number, thermophoretic coefficient (a function of Knudsen number), Eckert number (viscous heating effect), thermal conductivity parameter, heat absorption/generation parameter, wall transpiration parameter, Hartmann number and Schmidt number. The numerical details are discussed with relevant applications. Excellent correlation is achieved with earlier studies due to White (1974) and Chamkha and Issa (2000). The present problem finds applications in Optical Fiber Fabrication, aerosol filter precipitators, particle deposition on hydronautical blades, semiconductor wafer design, thermo-electronics and nuclear hazards.
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Thermophoretic hydromagnetic dissipative heat and mass transfer with lateral mass flux, heat source, Ohmic heating and thermal conductivity effects: Network simulation numerical study
Applied Thermal Engineering, 2009Co-Authors: Joaquín Zueco, H.s. Takhar, O. Anwar Bég, V.r. PrasadAbstract:International audienceA two-dimensional mathematical model is presented for the laminar heat and mass transfer of an electrically-conducting, heat generating/absorbing fluid past a perforated horizontal surface in the presence viscous and Joule (Ohmic) heating. The Talbot-Cheng-Scheffer-Willis formulation (1980) is used to introduce a thermophoretic coefficient into the concentration boundary layer equation. The governing partial differential equations are non-dimensionalized and transformed into a system of nonlinear ordinary differential similarity equations, in a single independent variable, . The resulting coupled, nonlinear equations are solved under appropriate transformed boundary conditions using the Network Simulation Method. Computations are performed for a wide range of the governing flow parameters, viz Prandtl number, thermophoretic coefficient (a function of Knudsen number), Eckert number (viscous heating effect), thermal conductivity parameter, heat absorption/generation parameter, wall transpiration parameter, Hartmann number and Schmidt number. The numerical details are discussed with relevant applications. Excellent correlation is achieved with earlier studies due to White (1974) and Chamkha and Issa (2000). The present problem finds applications in Optical Fiber Fabrication, aerosol filter precipitators, particle deposition on hydronautical blades, semiconductor wafer design, thermo-electronics and nuclear hazards
Oswaldo Luiz Alves - One of the best experts on this subject based on the ideXlab platform.
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Use of CsCl to enhance the glass stability range of tellurite glasses for Er3+ doped Optical Fiber drawing
Optical Components and Materials IV, 2007Co-Authors: Carmen Rosa Eyzaguirre, E. Rodriguez, Enver F. Chillcce, Sérgio Paulo Amaral Osório, Carlos L. Cesar, Italo Odone Mazali, Oswaldo Luiz Alves, Luiz C. BarbosaAbstract:Tellurite glasses are important as a host of Er 3+ ions because of their great solubility and because they present broader gain bandwidths than Er 3+ -doped silica, with promise to increase the bandwidth of communication systems. However, the small glass stability range (GSR) of tellurite glasses compromises the quality of the Optical Fibers. We show that the addition of CsCl to tellurite glasses can increase their GSR, making it easier to draw good quality Optical Fibers. CsCl acts as a network modifier in glass systems, weakening the network by forming Te-Cl bonds. We show that the thermal expansion coefficient mismatch is in the right direction for Optical Fiber Fabrication purposes and that the Bi 2 O 3 content can be used to control the refractive index of clad and core glasses. Single-mode and multi-mode Er 3+ -doped Optical Fibers were produced by the rod-in-tube method using highly homogeneous TeO 2 -ZnO-Li 2 O -Bi 2 O 3 -CsCl glasses. Far infrared spectra of the glass samples exhibit absorption bands of the Te-Cl bond.
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Use of CsCl to Enhance the Glass Stability Range of Tellurite Glasses for Er3+‐Doped Optical Fiber Drawing
Journal of the American Ceramic Society, 2007Co-Authors: Carmen Rosa Eyzaguirre, E. Rodriguez, Enver F. Chillcce, Sérgio Paulo Amaral Osório, Carlos L. Cesar, Luiz C. Barbosa, Italo Odone Mazali, Oswaldo Luiz AlvesAbstract:Tellurite glasses are important as a host of Er3+ ions because of their good solubility and because they present broadband Optical gain compared with Er3+-doped silica, with the potential to increase the bandwidth of communication systems. However, the small glass stability range (GSR) of tellurite glasses compromises the quality of the Optical Fibers. We show that the addition of CsCl to tellurite glasses can increase their GSR, making it easier to draw good-quality Optical Fibers. CsCl acts like a network modifier in glass systems, weakening the network by forming Te–Cl bonds. We show that the thermal expansion coefficient mismatch is in the right direction for Optical Fiber Fabrication purposes and that the Bi2O3 content can be used to control the refractive index of clad and core glasses. Single-mode and multi-mode Er3+-doped Optical Fibers were produced by the rod-in-tube method using highly homogeneous TeO2–ZnO–Li2O–Bi2O3–CsCl glasses.
Mukul Chandra Paul - One of the best experts on this subject based on the ideXlab platform.
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Silicon Nano-Particles Doped Optical Fiber: Fabrication, Characterization, and Application
Journal of Lightwave Technology, 2013Co-Authors: Alexander V. Kir'yanov, Sumita Das, Mukul Chandra Paul, Yu. O. Barmenkov, A. M. Martinez-gamez, Mrinmay Pal, J. L. Lucio-martinez, A. Arredondo-santos, V. A. Kamynin, Victor G. PlotnichenkoAbstract:The Fabrication of a new-type of Silicon nanoparticles (Si-n/p) doped silica Fiber is reported. The method is entirely based on the MCVD process, with no solution-doping technique being required. The TEM, EPMA, EDX, and electron diffraction analyses as well as the Raman, Optical absorption, and fluorescence spectra’ measurements confirm the formation of Si-n/p in the Fiber. When pumped at 406 nm, this Fiber fluoresces mainly in the VIS to near-IR spectral range and the fluorescence shows a multi-peak spectral structure in several wide bands. As a consequence of the high nonlinearity $n_{2}$ of the Fiber, effective supercontinuum generation at 1.6- $\mu{\rm m}$ excitation by tens ns-range, kW-level pulses is demonstrated.
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Nano-engineered Yb2O3 doped Optical Fiber: Fabrication, material characterizations, spectroscopic properties and lasing characteristics: a review
Science of Advanced Materials, 2012Co-Authors: Mukul Chandra Paul, Sumita Das, Mrinmay Pal, Sandip Bysakh, Shyamal Kumar Bhadra, Seongwoo Yoo, A.j. Boyland, J K SahuAbstract:This review summarizes the very recent work on development of Yb2O3 doped nano-crystalline YAG in a silica based preforms made by modified chemical vapour deposition (MCVD)-solution doping technique and under suitable thermal annealing of the preforms for next generation of Optical Fiber devices. There is a great need to engineer the composition as well as doping levels of different elements within the core glass during the preform making stages to generate phase-separated Yb2O3 doped yttria-alumino rich silica nano particles, with or without crystalline in nature, in the fibre. The discussion concentrates on making of Yb2O3 doped yttria-alumino rich YAG nano-crystals containing silica glass based perform, drawing of Fibers containing phase-separated dielectric nano-particles along with material characterizations, study of spectroscopic properties, photo-darkening phenomena and lasing characteristics. Also, approaches that may be applied for the formation of yttria alumina rich phase-separated crystalline nano-particles and dielectric nano-particles within the preform and Fiber core region respectively are discussed in this review.