Specialty flat-top beam delivery fibers with controlled beam parameter product

Jollivet, Clémence; Farley, Kevin; Conroy, Michael J.; Abramczyk, Jaroslaw; Belke, S.; Becker, Frank; Tankala, K.

doi:10.1117/12.2209348

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…An elegant solution is obviously an all fiber system delivering directly a top hat beam profile. This can be done by using a highly multimode fiber but it requires mixing a high enough number of modes and leads to a very low depth of focus and spatial incoherence 4 . The ideal solution is thus to use a single-mode fiber delivering a top hat profile.…”

Section: Introductionmentioning

confidence: 99%

First realization of a birefringent flat-top single-mode fiber

et al. 2016

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We report on the first polarization maintaining single-mode fiber that delivers a flat-top intensity profile at 1050 nm. A high quality fundamental flat mode was obtained. We showed that our fiber can be considered as single-mode in practice with low confinement losses. Its birefringence was measured to be 0.6x10 -4 , and the PER was measured at more than 20 dB even for a 20 m fiber long. Strategies to enhance this birefringence preserving the flat top profile and the singlemode behaviour as well are also discussed.

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Section: Introductionmentioning

confidence: 99%

First realization of a birefringent flat-top single-mode fiber

et al. 2016

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“…These earlier results did not consider amplifier fiber configurations with multiple cores and did not directly consider the impact of the pump lights numerical aperture (NA). Also a fiber design which is specifically suitable for achieving top hat multimode beam profiles over short propagation distances have also already been reported, 5 which however is not easily implemented into amplifier fibers even though it could be beneficial for increasing cladding pump absorption. The necessity of propagation effects for effective pump light absorption leads to hurdles, since in several fields a trend towards shorter fibers can be seen.…”

Section: Introductionmentioning

confidence: 99%

NA-dependent absorption in double clad multicore amplifier fibers

Yildiz,

Hässner,

Kuhn

et al. 2024

Fiber Lasers XXI: Technology and Systems

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We investigate cladding pump light absorption in double-clad multicore amplifier fibers in dependence of the pump numerical aperture (NA). Results indicate that for the investigated case the assumptions for Beers law break down and need to be revised to include an NA dependent absorption. In this work we present a method for NA resolved absorption measurements and focus on the absorption behavior of a double clad multicore fibers, where experimental results show that the cladding absorption is changing drastically with the NA of the pump light. Additionally pump modes are investigated numerically to assist these findings. These results have not only implications for amplifier performance but impact characterization of cladding pump light absorption for such fibers as well. Lastly it is also expected that such behavior can be mitigated or exploited by fiber design.

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Mitigation of thermally-induced performance limitations in coherently-combined multicore fiber amplifiers

Steinkopff¹,

Aleshire²,

Klenke³

et al. 2022

Opt. Express

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Multicore fiber (MCF) amplifiers have gained increasing interest over the past years and shown their huge potential in first experiments. However, high thermal loads can be expected when operating such an amplifier at its limit. Especially in short MCF amplifiers that are pumped in counter-propagation, this leads to non-uniform mode-shrinking in the cores and, consequently, to a degradation of the system performance. In this work we show different ways to counteract the performance limitations induced by thermal effects in coherently-combined, multicore fiber amplifiers. First, we will show that pumping MCFs in co-propagation will significantly improve the combinable average power since the thermal load at the fiber end is reduced. However, this approach might not be favorable for high energy extraction. Therefore, we will introduce a new MCF design pumped in counter-propagation that leads to a reduction of the thermal load at the fiber end, which will allow for both high combined output power and pulse energy.

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Specialty flat-top beam delivery fibers with controlled beam parameter product

Cited by 4 publications

References 5 publications

First realization of a birefringent flat-top single-mode fiber

First realization of a birefringent flat-top single-mode fiber

NA-dependent absorption in double clad multicore amplifier fibers

Mitigation of thermally-induced performance limitations in coherently-combined multicore fiber amplifiers

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