5,825 research outputs found
Fiber design for high-power low-cost Yb:Al-doped fiber laser operating at 980nm
No full textWe investigated an Yb:Al-doped depressed-clad hollow optical fiber (DCHOF) for cladding-pumped 980nm laser operation. With a careful design, the nonzero fundamental-mode cutoff characteristics of a DCHOF allows the competing 1030-1060nm emission to be filtered out, despite being quite close to 980nm. The laser yielded over 3W of output power in a diffraction limited beam (M -parameter degrades to 2.7, as a result of increased cladding-mode lasing, as the cladding thickness is reduced
Development of 3-D Printed Silica Preforms
No full textData related to the paper presented at CLEO Europe 2019:
Development of 3-D Printed Silica Preforms
A. Camacho-Rosales, M. NuñezVelázquez, X. Zhao, S. Yang, and J.K. Sahu
3-D printed silica preforms with complex geometries were produced by a customised SLS printer. The produced porous body was sintered before fibre drawing. An optical characterisation of the fabricated fibre is presented.</span
Advances in active fibres for high-power and high-brightness fibre sources
No full textThis paper reviews the progress in rare-earth doped fibre technology towards power scaling of high-brightness fibre sources
Dataset for: O-band Bi-doped fibre amplifiers: Present and Future
No full textDataset supports: Thipparapu, N. K., Sahu, J., & Payne, D. (2019). O-band Bi-doped fibre amplifiers: Present and future. Asian Journal of Physics, 28(7-9), 475-486.
This paper review the recent developments of the O-band Bi-doped fibre amplifiers. We also present the applications of Bi-doped fibre amplifiers and future prospects.</span
Multi-trench Fiber for high power laser applications
No full textOptical fibers have realized their immense potential for high power applications in the last decade. However, non-linearity still remains a challenge for power scaling for fiber lasers [1]. A large effective area of the fundamental mode of the optical fiber can increase the threshold of the non-linear effects [2]. However, simply increasing the core size leads to multi-mode operation and hence deteriorates the beam quality. Several novel optical fiber designs have been proposed to offer a large effective area of optical fibers such as Low NA Step index fibers, Photonic Crystal Fibers, Bragg Fibers, etc., while still maintaining single mode operation. Recently, we proposed a novel multi-trench fiber (MTF) design for large effective mode area, as shown by a cross-section schematic and a refractive index profile design in Fig. 1. [3]. This fiber design offers advantages of relatively easy fabrication, splicing, and cleaving. Numerical simulations reveal that the MTF fiber geometry can provide single-mode operation with a core diameter as high as 100µm with an effective area of ~ 10,000µm2 in a rod-type configuration and ~800µm2 in a bend configuration. A 30µm diameter core MTF has been fabricated and the cross-section and measured refractive index profile is shown in Fig. 2. S2 measurement shows ~50dB suppression of higher order modes (HOM) in a one meter length of fiber. Also, an ytterbium-doped single-trench-fiber laser (slope efficiency ~85%) with a 20µm diameter core has been experimentally demonstrated with very high suppression of HOM (~32dB), which was also verified by S2 measurement. The refractive index profile, plot of laser slope efficiency, an output beam profile and a laser output spectrum are shown in Fig. 3
Dataset in support of the Conference paper 'A highly temperature-insensitive Bi-doped fiber amplifier in the E+S-band with 20 dB flat gain from 1435-1475 nm'
No full textThis dataset supports the publication:
Yu Wang, Arindam Halder, David Richardson and Jayanta Sahu. (2022)
A highly temperature-insensitive Bi-doped fiber amplifier in the E+S-band with 20 dB flat gain from 1435-1475 nm
OFC 2023
The excel file contains all experimental data used for generating Fig.2(a) to Fig.2(d)
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Dataset for High gain Bi-doped all fiber amplifier for O-band DWDM optical fiber communication
No full textData supporting the paper:
Thipparapu, N. K., Wang, Y., Umnikov, A. A., Barua, P., Richardson, D., & Sahu, J. (2019). High gain Bi-doped all fiber amplifier for O-band DWDM optical fiber communication. In Optical Fiber Communication Conference (OFC) 2019 [8696672] (OSA Technical Digest; No. paper M1J.5). Rochester: OSA. DOI: 10.1364/OFC.2019.M1J.5</span
Dataset for 'A 40dB Gain all Fiber Bismuth-doped Amplifier Operating in the O-band'
No full textData supporting:
Thipparapu, N. K., Wang, Y., Umnikov, A. A., Barua, P., Richardson, D. J., & Sahu, J. K. (2019). 40 dB gain all fiber bismuth-doped amplifier operating in the O-band. Optics Letters, 44(9), 2248-2251. DOI: 10.1364/OL.44.002248</span
Matlab data for paper ""Non-Asymptotic Rates for Communication Efficient Distributed Zeroth Order Strongly Convex Optimization" by Sahu et al.
No full text<p>This is a Matlab data file for paper A.K. Sahu, D.Jakovetic, D. Bajovic and S. Kar, “Non-Asymptotic Rates for Communication Efficient Distributed Zeroth Order Strongly Convex Optimization”, IEEE Global Conference on Signal and Information Processing(GlobalSIP), 2018, see also: <a href="https://zenodo.org/record/3333576#.XSibRegzZPY">https://zenodo.org/record/3333576#.XSibRegzZPY</a></p>
Electro-optically Q-switched Er:YAG laser in-band pumped by an Er,Yb fiber laser
No full textElectro-optically Q-switched operation of an Er:YAG laser at 1645nm end-pumped by a cladding-pumped Er-Yb fiber laser is reported. Pulse energies up to 15mJ have been generated at a pulse repetition frequency of 29Hz
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