202,553 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
Tunable single-frequency ytterbium-sensitized erbium-doped fiber MOPA source with 150W (51.8 dBm) of output power at 1563 nm
No full textA single-frequency, single-mode ytterbium-sensitized erbium-doped fiber master-oscillator power-amplifier generated 150 W of continuous-wave output power at 1563 nm with 33% slope efficiency and was tuned in the range of 1546 to 1566 nm at >125 W
Dataset for Novel Fabrication Technique for Highly Efficient Tm-doped Fibers
No full textData for the paper:
Ramírez-Martínez, N. J., Núñez-Velázquez, M., Umnikov, A. A., & Sahu, J. K. (2018). Novel fabrication technique for highly efficient Tm-doped fibers. In CLEO: Science and Innovations, CLEO_SI 2018 (Vol. Part F94-CLEO_SI 2018). Washington D.C.: OSA. DOI: 10.1364/CLEO_SI.2018.SF3I.2</span
High power cladding-pumped Raman fiber laser with true single-mode output at 1660 nm
No full textWe report a 10 W continuous-wave cladding-pump Raman fiber laser with single-mode output at 1660 nm pumped by a high-power Er:Yb fiber amplifier. The laser threshold was 6.5 W and its slope efficiency was 67%
Bismuth doped fibres for near-infrared light sources: progress and prospects
No full textThe luminescence properties of Bi-doped silica fibres in the near-infrared region are discussed. Bi-doped fibre lasers and amplifiers and their dependence on the unsaturable loss and excited state absorption are also discussed
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
Bismuth doped fiber laser performance on effective fiber cooling
No full textIn the past, bismuth doped fiber (BiDF) lasers, operating in the 1160-1300 nm wavelength range, have gained much attention as they are promising for many applications; including medical and astronomy. However, the poor lasing efficiency of BiDF laser, compared to the widely used rare-earth doped fiber lasers, requires further investigations. One possible reason that can impair the BiDF laser efficiency is the presence of high unsaturable loss in the fiber, which is temperature dependent. Thus, temperature rise in the BiDF under strong pumping can be a limiting factor for such laser systems. Here, we report the dependence of BiDF laser efficiency on effective cooling of the fiber
Impact of energy-transfer-upconversion on the performance of hybrid Er:YAG lasers
No full textUsing a hybrid fiber-bulk laser scheme based on Er:YAG, we have achieved ~60 W and ~30 W of continuous-wave output at 1645nm and 1617nm respectively, and Q-switched pulse energies up to ~30 mJ (limited by coating damage). Investigation of various factors influencing laser performance has revealed that energy-transfer-upconversion can have a very detrimental impact on efficiency, even in continuous-wave mode of operation. In this paper we report on the results of this study, discuss various measures for reducing energy-transfer-upconversion and its effect on laser performance, and consider the prospects for further increase in output power and pulse energy
High-power single-frequency thulium-doped fiber master-oscillator power-amplifier at 1943nm
No full textA Tm-doped fiber master-oscillator power-amplifier system that generates over 100W of single frequency output in a near-diffraction-limited beam with an M2 parameter of 1.25 is described. The prospects for further increase in power are considered
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