Publication

System and method for high beam quality pulse generation in mode-locked multimode fiber lasers

Demetri Psaltis, Christophe Moser, Ugur Tegin
2021
Patents

Résumé

A system and method to generate ultrashort high beam quality pulses from spatio- temporally mode-locked multimode fiber laser are described. The invention relies on engineering the intra-cavity pulse propagation in a multimode laser cavity to shape the spatial and temporal properties of the output pulses. The invention allows the generation of Kerr-induced self-beam cleaning when mode-locking is obtained. Using this invention, high power ultrashort pulses can be achieved with a Gaussian mode profile by using commercially available multimode fibers.

Source officielle

https://infoscience.epfl.ch/entities/publication/7c584dcb-09c6-4779-8617-d129ec13be65

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Demetri Psaltis, Christophe Moser, Ugur Tegin
2021
Patents

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/7c584dcb-09c6-4779-8617-d129ec13be65

À propos de ce résultat

Concepts associés (24)

Fiber laser

A fiber laser (or fibre laser in Commonwealth English) is a laser in which the active gain medium is an optical fiber doped with rare-earth elements such as erbium, ytterbium, neodymium, dysprosium, praseodymium, thulium and holmium. They are related to doped fiber amplifiers, which provide light amplification without lasing. Fiber nonlinearities, such as stimulated Raman scattering or four-wave mixing can also provide gain and thus serve as gain media for a fiber laser.

Laser

thumb|250px|Lasers rouges (660 & ), verts (532 & ) et bleus (445 & ). thumb|250px|Rayon laser à travers un dispositif optique. thumb|250px|Démonstration de laser hélium-néon au laboratoire Kastler-Brossel à l'Université Pierre-et-Marie-Curie. Un laser (acronyme issu de l'anglais light amplification by stimulated emission of radiation qui signifie « amplification de la lumière par émission stimulée de radiation ») est un système photonique.

Ultrashort pulse

In optics, an ultrashort pulse, also known as an ultrafast event, is an electromagnetic pulse whose time duration is of the order of a picosecond (10−12 second) or less. Such pulses have a broadband optical spectrum, and can be created by mode-locked oscillators. Amplification of ultrashort pulses almost always requires the technique of chirped pulse amplification, in order to avoid damage to the gain medium of the amplifier. They are characterized by a high peak intensity (or more correctly, irradiance) that usually leads to nonlinear interactions in various materials, including air.

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