Coherent beam combining with an ultrafast multicore Yb-doped fiber amplifier

Ramirez, Lourdes Patricia; Hanna, Marc; Bouwmans, Géraud; Hamzaoui, Hicham El; Bouazaoui, Mohamed; Labat, Damien; Delplace, Karen; Pouysegur, Julien; Guichard, Florent; Rigaud, Philippe; Kermène, Vincent; Desfarges‐Berthelemot, Agnès; Barthélémy, Alain; Prévost, F.; Lombard, Laurent; Zaouter, Yoann; Druon, Frédéric; Georges, Patrick

doi:10.1364/oe.23.005406

Cited by 59 publications

(33 citation statements)

References 22 publications

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“…There have been many extra-cavity approaches to improving brightness from laser sources, from the use of fiber lasers [2,3], to coherent beam combining [4][5][6], to semiconductor lasers [7][8][9]. Intra-cavity approaches, however, have seen much interest over a number of years [10][11][12] and are highly attractive for improving laser brightness, as they potentially offer better pump-to-mode overlap, thus enabling higher energy extraction with an improved beam quality at the output.…”

Section: Introductionmentioning

confidence: 99%

Brightness enhancement in a solid-state laser by mode transformation

Naidoo¹,

Litvin²,

Forbes³

2018

Optica

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Laser brightness is a measure of the ability to deliver intense light to a target and encapsulates both the energy content and the beam quality. High-brightness lasers require that both parameters be maximized, yet standard laser cavities do not allow this. For example, multimode beams, a mix of many transverse modes, have a high energy content but low beam quality, while single transverse mode Gaussian beams have a good beam quality, but their small mode volume means a low energy extraction. Here we overcome this fundamental limitation and demonstrate an optimal approach to realizing high-brightness lasers. We employ intra-cavity beam shaping to produce a single transverse mode that changes profile inside the cavity, Gaussian at the output end and flattop at the gain end, such that both energy extraction and beam quality are simultaneously optimized. This work should have a significant influence on the design of future high-brightness laser cavities.

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Section: Introductionmentioning

confidence: 99%

Brightness enhancement in a solid-state laser by mode transformation

Naidoo¹,

Litvin²,

Forbes³

2018

Optica

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“…Work has already been started on integrating multiple signal cores into a single fiber, as shown in Fig. 8, and first proof-ofprinciple experiments regarding their signal combination have been carried out [52]- [54]. The scaling of the total mode-field diameter (adding all cores) in the same way as for multiple single-core amplifiers is straightforward and will increase the pulse energy and peak power handling capabilities equally.…”

Section: Future Scaling Prospectsmentioning

confidence: 99%

Coherent Beam Combination of Ultrafast Fiber Lasers

Klenke

Müller

Stark

et al. 2018

IEEE J. Select. Topics Quantum Electron.

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The performance of fiber laser systems has drastically increased over recent decades, which has opened up new industrial and scientific applications for this technology. However, currently a number of physical effects prevents further power scaling. Coherent combination of beams from multiple emitters has been established as a power scaling technique beyond these limitations. It is possible to increase the average power, and for pulsed laser systems, also parameters such as the pulse energy and the peak power. To realize such laser systems, various aspects have to be taken into account that include beam combination elements, stabilization systems, and the output parameters of the individual amplifiers. After an introduction to the topic, various ways of implementing coherent beam combination for ultrashort pulses are explored. Besides the spatial combination of beams, the combination of pulses in time will also be discussed. Recent experimental results will be presented, including multidimensional (i.e., spatial and temporal) combination. Finally, an outlook on possible further developments is given, focused on scaling the number of combinable beams and pulses.

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“…Such master oscillator power amplifier (MOPA) based configurations might provide significant scope for power scaling of beam-shaped fibre lasers 41 . In addition, CBC from MCF amplifier/lasers has previously been successfully demonstrated as an effective way for power scaling of simple Gaussian beams [42][43][44] .…”

mentioning

confidence: 99%

Reconfigurable structured light generation in a multicore fibre amplifier

et al. 2020

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Structured light, with spatially varying phase or polarization distributions, has given rise to many novel applications in fields ranging from optical communication to laser-based material processing. However the efficient and flexible generation of such beams from a compact laser source at practical output powers still remains a great challenge. Here we describe an approach capable of addressing this need based on the coherent combination of multiple tailored Gaussian beams emitted from a multicore fibre (MCF) amplifier. We report a proofof-concept structured light generation experiment, using a cladding-pumped 7-core MCF amplifier as an integrated parallel amplifier array and a spatial light modulator (SLM) to actively control the amplitude, polarization and phase of the signal light input to each fibre core. We report the successful generation of various structured light beams including highorder linearly polarized spatial fibre modes, cylindrical vector (CV) beams and helical phase front optical vortex (OV) beams.

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Coherent beam combining with an ultrafast multicore Yb-doped fiber amplifier

Cited by 59 publications

References 22 publications

Brightness enhancement in a solid-state laser by mode transformation

Brightness enhancement in a solid-state laser by mode transformation

Coherent Beam Combination of Ultrafast Fiber Lasers

Reconfigurable structured light generation in a multicore fibre amplifier

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