Top-hat beam output with 100  μJ temporally shaped narrow-bandwidth nanosecond pulses from a linearly polarized all-fiber system

Calvet, Pierre; Valentin, C.; Gouriou, Pierre; Quiquempois, Yves; Bouwmans, Géraud; Bigot, Laurent; Coulombier, Quentin; Douay, M.; Habert, Rémi; Delplace, Karen; Mussot, Arnaud; Hugonnot, Emmanuel

doi:10.1364/ol.39.004780

Cited by 4 publications

(2 citation statements)

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“…[9]. However this first version did not enable to control the light polarization so that we had to use a very short fiber length (~few mm) to preserve polarization of an all-fiber system delivering 100µJ temporally shaped top-hat beam in the nanosecond regime [10]. As this control of the polarization is required for many applications [11] The bending behavior of this FM polarized along x has been studied ( figure 5).…”

Section: Introductionmentioning

confidence: 99%

Top hat single-mode polarization maintaining fiber and polarizing numerical design

et al. 2016

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Compactness, long term stability and no free-space alignment are important advantages of fiber lasers over bulky systems. These fiber lasers have also demonstrated their capability to deliver high-power pulses and are thus suitable for numerous applications. Nevertheless the intensity profile delivered usually has a Gaussian-like shape, which most of the time is sufficient, but it could be interesting, for many applications (laser-biological tissues interactions, heat treatment, industrial laser processing or for seeding large-scale laser facilities like Laser MegaJoule) to obtain a homogeneous intensity profile at the fiber laser output. Moreover several of these applications required a linearly polarized output beam. In order to achieve all these requirements we have developed and realized a new fiber design. This fiber is the first polarization maintaining single-mode fiber delivering a flat top intensity. A high quality flat mode was obtained at 1.05µm through the use of a well-tailored index profile and single-mode behavior was verified by shifting the injection and using the S² imaging. Moreover, boron Stress Applying Parts (SAPs) including in the cladding led to a birefringence of 0.6x10 -4 and a measured PER better than 20dB even for a long fiber length (~20 m). Alongside the fabrication, we developed a simulation code, using Comsol Multiphysics®, to take into account the stress dependency induced by the SAPs. Further modeling allows us to present an effectively single-mode fiber design, delivering a top-hat mode profile and exhibiting a polarizing behavior.

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Section: Introductionmentioning

confidence: 99%

Top hat single-mode polarization maintaining fiber and polarizing numerical design

et al. 2016

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“…This amplifier allows the generation of multi-kHz nanosecond pulses with accurate tailored temporal pulse profiles. In this proceeding we will present experimental results obtain with our first table mounting system in 2014 [20] and in a second part we will give information of our pre-industrial system which is in his commissioning phase.…”

Section: Introductionmentioning

confidence: 99%

Industrial mJ-class all-fiber front end with spatially coherent top-hat beam output used as seeder for high power laser

et al. 2015

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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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Top-hat beam output with 100 μJ temporally shaped narrow-bandwidth nanosecond pulses from a linearly polarized all-fiber system

Abstract: We report on an all-fiber system delivering more than 100 μJ pulses with a top-hat beam output in the few nanoseconds regime at 10 kHz. The linearly polarized flattened beam is obtained thanks to a 3-mm-long single-mode microstructured fiber spliced to the amplifier's output.

Cited by 4 publications

References 16 publications

Top hat single-mode polarization maintaining fiber and polarizing numerical design

Top hat single-mode polarization maintaining fiber and polarizing numerical design

Industrial mJ-class all-fiber front end with spatially coherent top-hat beam output used as seeder for high power laser

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

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