Results 281 to 290 of about 10,828,663 (311)

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
openaire   +1 more source

On the Raman threshold of passive large mode area fibers

SPIE Proceedings, 2011
The output power of fiber optic laser systems has been exponentially increasing in the last years. However, non-linear effects, and in particular stimulated Raman scattering (SRS), are threatening to seriously limit the development pace in the near future.
Cesar Jauregui, Jens Limpert, Andreas Tünnermann   +2 more
openaire   +1 more source

Intuitive modeling of bend distortion in large-mode-area fibers

Optics Letters, 2007
Bend distortion is emerging as an important consideration in the design of amplifier fibers with a large mode area, in addition to bend loss and mode-coupling effects. Simple, intuitive estimates of distortion sensitivity are presented for two interesting classes of fibers, in agreement with full numerical simulations.
openaire   +2 more sources

Measuring bend losses in large-mode-area fibers

SPIE Proceedings, 2015
We investigate the measurement of bend losses in few-mode large-mode-area (LMA) fibers. The influence of the light source spectral characteristics, modal power content and cladding light on the measurement accuracy and precision is studied experimentally. Monte-Carlo simulations are performed to understand the distribution of the variations. This study
Changgeng Ye, Joona Koponen, Ville Aallos, Teemu Kokki, Laeticia Petit, Ossi Kimmelma   +5 more
openaire   +1 more source

Large Mode Area Guidance in a Simple Fiber Structure

CLEO: 2015, 2015
We demonstrate higher-order-mode (A eff ∼1800μm2) propagation in a 100-μm-OD pure-silica fiber with a low-index polymer jacket commonly used for fiber-laser pump-guidance. This simple structure obviates the need for complex designs deemed necessary for realizing large-mode-area fibers.
Lars Rishøj, Maxwell Jones, Jeff Demas, Gautam Prabhakar, Lu Yan, Thomas Hawkins, John Ballato, Siddharth Ramachandran   +7 more
openaire   +1 more source

The design of large-mode-area single-mode fiber

SPIE Proceedings, 2008
Based on the frustrated total internal reflection theory, a leaky large-mode-area double clad fiber is designed. The propagation constants and leakage loss of the fundamental mode LP 01 and sub-low order mode LP 11 is investigated by using of the matrix method. Results show that the designed fiber can operate with single-mode.
Guohua Wu, Libo Li, Qihong Lou, Jun Zhou, Wenhan Huang, Shouqi Zhang, Wei Wang   +6 more
openaire   +1 more source

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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Bend distortion in large mode area fiber amplifiers

OECC/ACOFT 2008 - Joint Conference of the Opto-Electronics and Communications Conference and the Australian Conference on Optical Fibre Technology, 2008
As ever larger mode area fibers are designed and incorporated into high-power amplifiers, bend-induced mode distortion becomes an important limitation. In any reasonable coiled-fiber arrangement, bend distortion can reduce mode area, gain interaction, and suppression of higher-order modes.
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Large Mode Area Photonic Crystal Fiber

Optics and Photonics News, 1998
J. C. Knight, T. A. Birks, R. F. Cregan, P. St. J. Russell   +3 more
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Large mode area fibres for high power lasers [PDF]

, 1998
Fibre lasers are rapidly becoming increasingly attractive as high power versatile sources. We report here the development of large mode area erbium doped fibres. These fibres were then incorporated into simple laser cavities resulting in record pulse energy levels.
Broderick, N.G.R., Offerhaus, H.L., Richardson, D.J., Caplen, J.E., Dong, L., Sammut, R.A.   +5 more
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