Results 251 to 260 of about 330,462 (300)

Very-large-mode-area, single-mode multicore fiber

Optics Letters, 2009
A single-mode evanescently coupled multicore fiber consisting of 19 hexagonally arranged cores is investigated. Theoretical and experimental results are presented and compared to an equivalent hypothetical step-index fiber. A fundamental mode with an effective area of 465 microm(2) and a beam propagation factor M(2) of 1.02 was measured, showing the ...
Moritz M, Vogel, Marwan, Abdou-Ahmed, Andreas, Voss, Thomas, Graf   +3 more
openaire   +2 more sources

Filamentation analysis in large-mode-area fiber lasers

Journal of the Optical Society of America B, 2006
We drive an analytic expression for filament gain in fiber lasers due to self focusing. The filamentation process has two thresholds that must be met, with beam-quality degradation occurring for peak powers above a megawatt.
L. Sun, J. R. Marciante
openaire   +1 more source

Photodarkening measurements in large mode area fibers

SPIE Proceedings, 2007
Yb-doped fibers are widely used in applications requiring high average output powers and high power pulse amplification. Photodarkening is one limiting factor in these fibers. In this paper, characterization of photodarkening in large-mode-area (LMA) fibers is presented building upon our previous work, which indicated that meaningful comparison of ...
Joona Koponen, Mikko Söderlund, Hanna J. Hoffman, Dahv Kliner, Jeffrey Koplow   +4 more
openaire   +1 more source

Very Large Mode Area Pixelated Bragg Fibers

Workshop on Specialty Optical Fibers and Their Applications, 2015
Generalized half-wave-stack condition combined with well-chosen hetero-structured cladding is used to design and realize scalable single-mode pixelated Bragg fibers with mode field diameter as large as 60 μm.
Y. Quiquempois, J-P Yehouessi, O. Vanvincq, G. Bouwmans, A. Cassez, L. Bigot   +5 more
openaire   +1 more source

Ultra large mode area pixelated Bragg fiber

SPIE Proceedings, 2016
We report on the design and the fabrication of a new design of an all-solid Bragg fiber based on the pixelization and heterostructuration of a cladding made of only two high index rings. The thickness of the low index ring as well as the geometry of the heterostructuration (its symmetry and the number of removed pixels) have been chosen to maximize the
J.-P. Yehouessi, G. Bouwmans, O. Vanvincq, A. Cassez, R. Habert, Y. Quiquempois, L. Bigot   +6 more
openaire   +1 more source

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
openaire   +3 more sources

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
openaire   +3 more sources

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
openaire   +1 more source

Novel large-mode area fibers for high power fiber lasers

Advanced Photonics 2016 (IPR, NOMA, Sensors, Networks, SPPCom, SOF), 2016
We review all-solid trench-assisted fiber designs for mode-area scaling in flexible fibers. Our proposed fiber designs offer great potential for power scaling of monolithic single-mode fiber laser systems and for high-brightness laser beam ...
Jayanta K. Sahu, Deepak Jain
openaire   +1 more source