Photonic crystal fiber amplifiers for high power ultrafast fiber lasers

Alkeskjold, Thomas Tanggaard; Laurila, Marko; Weirich, Johannes; Johansen, Mette Marie; Olausson, Christina B.; Lumholt, Ole; Noordegraaf, Danny; Maack, Martin D.; Jakobsen, C.

doi:10.1515/nanoph-2013-0050

Cited by 21 publications

(9 citation statements)

References 39 publications

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“…In the past few years, several LMA fibers emerged following the development of photonic crystal fibers (PCFs), allowing effective single-mode operation: large-pitch fibers [11] , all-solid photonic bandgap fibers [12] , chirally coupled core fibers [13] , leakage channel fibers [14] , and distributed mode filtering fibers [15] . Among them, the chirally coupled core fibers and the leakage channel fibers have only achieved mode areas in the range of 1500-3500 µm 2 at 1.06 µm [13,14] , which could not sustain a further increase of the output power of the fiber laser.…”

Section: Introductionmentioning

confidence: 99%

Design of large mode area all-solid anti-resonant fiber for high-power lasers

Zhang

Gao

Ding

et al. 2021

High Pow Laser Sci Eng

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High-power fiber lasers have experienced a dramatic development over the last decade. Further increasing the output power needs an upscaling of the fiber mode area, while maintaining a single-mode output. Here, we propose an all-solid anti-resonant fiber (ARF) structure, which ensures single-mode operation in broadband by resonantly coupling higher-order modes into the cladding. A series of fibers with core sizes ranging from 40 to 100 μm are proposed exhibiting maximum mode area exceeding 5000 μm2. Numerical simulations show this resonant coupling scheme provides a higher-order mode (mainly TE01, TM01, and HE21) suppression ratio of more than 20 dB, while keeping the fundamental mode loss lower than 1 dB/m. The proposed structure also exhibits high tolerance for core index depression.

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Section: Introductionmentioning

confidence: 99%

Design of large mode area all-solid anti-resonant fiber for high-power lasers

Zhang

Gao

Ding

et al. 2021

High Pow Laser Sci Eng

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“…The control over laser output modal content is no longer strictly bound to the engineering of refractive index contrast between the core and the cladding of the fiber, which actually presents some technological limitation. Instead, the mode content can be finely tailored with a proper design of the fiber cross-section geometry [5,6]. This has impacted on the possibility to enlarge the core area, preserving the SM operation, with benefits on fiber laser and amplifier operation, in terms of output power.…”

Section: Introductionmentioning

confidence: 99%

Mode discrimination criterion for effective differential amplification in Yb-doped fiber design for high power operation

et al. 2017

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The mode discrimination criterion for single mode operation, usually considered in fiber amplifiers designed for high power operation, has been investigated and tested on three different fiber designs, a large pitch fiber and two symmetry free photonic crystal fibers. To have a significant collection of results, parameters like pump configuration, pump power, and amplifier length have been varied. The analysis has been carried out through the use of a custom numerical tool provided with efficient thermal and spatial amplification models. From the obtained results, it is possible to observe that the mode discrimination criterion is helpful but not strictly necessary to pledge an effective single mode operation through differential amplification. This fact extends the possibility for the study, as well as for the optimization, of different fiber designs. The use of advanced numerical analysis, which takes into consideration amplification along with thermally influenced modes guidance, becomes extremely useful for an effective fiber design.

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“…In the last two decades a huge research effort, driven by a strong industrial interest, has led to a continuous performance enhancement of high-power fiber lasers, which currently outperform other technologies in terms of brightness, beam quality, reliability, versatility and compactness [1][2][3]. The photonic-crystal fiber (PCF) [4] has been one of the key-enabling technologies for this improvement [5]. Indeed, it allows to maintain the Single-Mode (SM) operation while significantly increasing the fiber mode area [6,7], thus reducing the impact of nonlinear effects, which represent the main limitation for high peak power operation of pulsed fiber lasers [8].…”

Section: Introductionmentioning

confidence: 99%

Thermal modeling of gain competition in Yb-doped large-mode-area photonic-crystal fiber amplifier

Rosa¹,

Coscelli²,

Poli³

et al. 2015

Opt. Express

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We propose a new model for gain competition effects in high-power fiber amplifiers, which accounts for the thermal effects of heat load on the doped core overlap of the propagating light field. The full-vectorial nature of the fiber modes is modeled by an embedded finite-element method modal solver, and the temperature profile is calculated by a simple and efficient radial heat propagation solver. The model is applied to a Yb³⁺-doped LPF45 air-clad photonic-crystal fiber amplifier for coand counter-propagating pumping setups, showing gain competition in conditions of severe heat load.

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Photonic crystal fiber amplifiers for high power ultrafast fiber lasers

Cited by 21 publications

References 39 publications

Design of large mode area all-solid anti-resonant fiber for high-power lasers

Design of large mode area all-solid anti-resonant fiber for high-power lasers

Mode discrimination criterion for effective differential amplification in Yb-doped fiber design for high power operation

Thermal modeling of gain competition in Yb-doped large-mode-area photonic-crystal fiber amplifier

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