Results 261 to 270 of about 618,573 (283)

Large-mode-area optical fiber for photonic nanojet generation

Optics Letters, 2019
The photonic nanojet (PNJ) generated by a shaped optical fiber tip is an attractive technology for laser micro-machining. The working distance has the same order of size as the fiber core diameter; therefore, multimode (MM) fibers are generally preferred.
Pierron, Robin, Chabrol, Grégoire, Roques, Stéphane, Pfeiffer, Pierre, Yehouessi, Jean-Paul, Bouwmans, Géraud, Lecler, Sylvain   +6 more
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Bend-compensated design of large-mode-area fibers

Optics Letters, 2006
Cone-shaped profiles illustrate the recently proposed bend-compensated strategy for large-mode-area amplifier fiber design. Simulations show that introducing a bend-compensating gradient into the fiber profile simultaneously improves mode area and reduces higher-order-mode impairments in a spooled-fiber amplifier.
openaire   +2 more sources

Polarizing very-large-mode-area bragg fiber

2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC), 2011
Single-mode larger-mode-area (LMA) all-glass (free of air-holes) fibers are required for all-fiber high-power lasers and amplifiers as they allow for efficient splicing with other components, which is impossible in the case of LMA photonic crystal fiber. Recently, we have demonstrated an active all-glass Bragg fiber with a mode-field diameter of 26 µm (
S. S. Aleshkina, M. E. Likhachev, A.D. Pryamikov, D. A. Gaponov, A. N. Denisov, M. M. Bubnov, M. Yu. Salganskii, A. N. Guryanov, S. Fevrier   +8 more
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Multiring large-mode-area delivery fiber for high power

Applied Optics, 2013
The study presents a novel design of multiring delivery fiber with large mode area for high power. Using a FiberCAD method, we investigated a fiber whose core is surrounded by alternative low- and high-index rings. Based on our calculation, the effective area is 400 μm2 at 1.08 μm, larger than the ~280 μm2 of conventional step-index fiber (20/400). The
Li, Lu, Zhang, Aidong, Zhan, Huan, He, Jianli, Shi, Tengfei, Zhou, Zhiguang, Xiao, Xusheng, Lin, Aoxiang   +7 more
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Parasitic Modes in Large Mode Area Microstructured Fibers

OFC/NFOEC 2007 - 2007 Conference on Optical Fiber Communication and the National Fiber Optic Engineers Conference, 2007
We present experimental evidence for parasitic modes guided by both bandgap and low density of state effects in large mode area silica microstructured fibers and explore ways of minimizing their presence via the fiber geometry.
Joanne C. Flanagan, R. Amezcua-Correa, F. Poletti, J.R. Hayes, N.G.R. Broderick, D.J. Richardson   +5 more
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Low loss large mode area Bragg fibre

31st European Conference on Optical Communications (ECOC 2005), 2005
We report on the loss reduction in large mode area fibres using a mixed total-internal-reflection and bandgap guidance mechanism. A 270-μm2 mode area fibre exhibits 10-dB/km propagation loss at 1.064 μm and low bend loss. (2 pages)
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Large-mode-area Fiber with Non-circular Cores

2018 23rd Opto-Electronics and Communications Conference (OECC), 2018
A non-circular core Yb-doped fiber was fabricated in-house. Nearly 200 W output power was obtained with this fiber in a linear cavity. The slope efficiency was 67%. The measured $M_{x,y}^2$ was 1.5 and 3.1, respectively.
J. Ji, H. Lin, R. Sidharthan, D. Ho, Y. Zhou, N. Xia, J. Nilsson, S. Yoo   +7 more
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Efficient bending compensation of large mode area fiber

SPIE Proceedings, 2014
While much research has been developed to achieve very large mode areas (LMA) fibers, many difficulties arise, such as bending losses, mode deformation, and high order modes suppression. The main obstacle which remains difficult to confront in LMA fibers is bending distortion.
Souaci Farida, Ya-Xian Fan, Li-Bo Yuan
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Adiabatic bend transitions for large mode area fibres

Optics Communications, 2010
Adiabatic bend transitions in large mode area multimode fibres were investigated theoretically using the beam propagation method. Adiabatic bend transducers preserve the power of guided light in the fundamental mode while guiding from one level of curvature to another for improved operation of mode filters and fibre amplifiers.
Stefan Grünsteidl, João M. Sousa, Thomas J. Glynn   +2 more
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Single-mode large-mode-area Er-Yb fiber

Optical Components and Materials XVI, 2019
Single-mode Er-Yb fibers based on phosphorosilicate glass matrix highly doped with fluorine have been fabricated using modified all-gas phase MCVD technology. Fibers have core doped by 6.5 mol.% of P2O5, 0.9 wt.% of F and different concentration of Er and Yb. The core NA was about 0.07-0.08 relative to the pure silica level.
Maxim Khudyakov, Aleksey Lobanov, Denis Lipatov, Konstantin Bobkov, Svetlana Aleshkina, Tatyana Kochergina, Mikhail Bubnov, Alexey Abramov, Nikolai Vechkanov, Aleksey Guryanov, Mikhail E. Likhachev   +10 more
openaire   +1 more source