Space-time adaptive control of femtosecond pulses amplified in a multimode fiber

Florentin, Raphaël; Kermène, Vincent; Desfarges‐Berthelemot, Agnès; Barthélémy, Alain

doi:10.1364/oe.26.010682

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…Alternatively, appropriate structuring of the seed beam wavefront can shape the light amplified by a multimode fiber 71 . Output beam narrowing and cleaning, as well as spatial and temporal focusing, are realized by adaptive control of the input wavefront 72 .…”

Section: Multimode Fiber Amplifiermentioning

confidence: 99%

Complex lasers with controllable coherence

et al. 2019

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The invention of lasers 60 years ago is one of the greatest breakthroughs in modern optics. Throughout the years, lasers have enabled major scientific and technological advancements, and have been exploited in numerous applications due to their advantages such as high brightness and high coherence. However, the high spatial coherence of laser illumination is not always desirable, as it can cause adverse artifacts such as speckle noise in imaging applications. To reduce the spatial coherence of a laser, novel cavity geometries and alternative feedback mechanisms have been developed. By tailoring the spatial and spectral properties of cavity resonances, the number of lasing modes, the emission profiles and the coherence properties can be controlled. This technical review presents an overview of such unconventional, complex lasers, with a focus on their spatial coherence properties. Laser coherence control not only provides an efficient means for eliminating coherent artifacts, but also enables new applications.

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Section: Multimode Fiber Amplifiermentioning

confidence: 99%

Complex lasers with controllable coherence

et al. 2019

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“…By enabling more systematic strategies rather than heuristic approaches (e.g. in the optimization of multidimensional systems including beam shaping and space-time focusing in multimode fibers [88][89][90]), machine learning could enable unprecedented level of control in those applications. Another important area where we expect machine learning to lead to significant progress is the discovery of models using data-driven strategy, allowing for finding governing mathematical equations of complex optical phenomena or photonics systems.…”

Section: Outlook and Challengesmentioning

confidence: 99%

Machine learning and applications in ultrafast photonics

et al. 2020

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Recent years have seen the rapid growth and development of the field of smart photonics, where machine learning algorithms are being matched to optical systems to add new functionalities and to enhance performance. An area where machine learning shows particular potential to accelerate technology is the field of ultrafast photonics -the generation and characterization of light pulses, the study of light-matter interactions on short timescales, and high-speed optical measurements. Our aim here is to highlight a number of specific areas where the promise of machine learning in ultrafast photonics has already been realized, including the design and operation of pulsed lasers, and the characterization and control of ultrafast propagation dynamics. We also consider challenges and future areas of research.

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Gain-induced Kerr beam cleaning in a femtosecond fiber amplifier

et al. 2023

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Kerr beam cleaning is a nonlinear phenomenon in graded-index multimode fiber where power flows toward the fundamental mode, generating bell-shaped output beams. Here we study beam cleaning of femtosecond pulses accompanied by gain in a multimode fiber amplifier. Mode-resolved energy measurements and numerical simulations showed that the amplifier generates beams with high fundamental mode content (greater than 30% of the overall pulse energy) for a wide range of amplification levels. Control experiments using stretched pulses that evolve without strong Kerr nonlinear effects showed a degrading beam profile, in contrast to nonlinear beam cleaning. Temporal measurements showed that seed pulse parameters have a strong effect on the amplified pulse quality. These results may influence the design of future high-performance fiber lasers and amplifiers.

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Space-time adaptive control of femtosecond pulses amplified in a multimode fiber

Cited by 4 publications

References 24 publications

Complex lasers with controllable coherence

Complex lasers with controllable coherence

Machine learning and applications in ultrafast photonics

Gain-induced Kerr beam cleaning in a femtosecond fiber amplifier

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