Stability calculations for the ytterbium-doped fiber laser passively mode-locked through nonlinear polarization rotation

We investigate theoretically a fiber laser passively mode-locked with nonlinear polarization rotation. A unidirectional ring cavity is considered with a polarizer placed between two sets of a halfwave plate and a quarterwave plate. A master equation is derived and the stability of the continuous and mode-locked solutions is studied. In particular, the effect of the orientation of the four phase plates and of the polarizer on the mode-locking regime is investigated

Three-dimensional writing inside silicon using a 2-µm picosecond fiber laser

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Recent advances on time-stretch dispersive Fourier transform and its applications

The need to measure high repetition rate ultrafast processes cuts across multiple areas of science. The last decade has seen tremendous advances in the development and application of new techniques in this field, as well as many breakthrough achievements analyzing non-repetitive optical phenomena. Several approaches now provide convenient access to single-shot optical waveform characterization, including the dispersive Fourier transform (DFT) and time-lens techniques, which yield real-time ultrafast characterization in the spectral and temporal domains, respectively. These complementary approaches have already proven to be highly successful to gain insight into numerous optical phenomena including the emergence of extreme events and characterizing the complexity of laser evolution dynamics. However, beyond the study of these fundamental processes, real-time measurements have also been driven by particular applications ranging from spectroscopy to velocimetry, while shedding new light in areas spanning ultrafast imaging, metrology or even quantum science. Here, we review a number of landmark results obtained using DFT-based technologies, including several recent advances and key selected applications. © 2022 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group

Ultrafast fiber lasers for material analysis and dense media metrology

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Ultrafast fiber lasers for material analysis and dense media metrology

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Etude et réalisation de lasers à fibre de puissance

Ce travail est consacré à l'étude d'un laser à fibre double gaine dopée à l'ytterbium, pompé transversalement à travers une encoche, dans différents régimes de fonctionnement autour de 1.06 mm. Sont d'abord présentés les lasers à fibre de puissance incluant les nouvelles structures des fibres double gaine ainsi que les techniques de pompage par diode. Puis une étude détaillée du fonctionnement du laser à fibre double gaine dopée à l'ytterbium dans différentes configurations optiques est présentée. Différents régimes impulsionnels résultants des effets non-linéaires dans la fibre ont été identifiés. L'influence des pertes de la cavité ainsi que la puissance de pompage est également étudiée. Nous montrons que le laser est efficacement stabilisé en utilisant une cavité en anneau unidirectionnelle où la diffusion Brillouin contra-propagative est supprimée. L'utilisation d'une telle configuration nous a permis de concrétiser une source laser avec une intensité continue délivrant une puissance de 800mW et accordable dans la gamme 1.04-1.1 mm. La largeur de la raie laser est d'environ 0.1 nm. La troisième partie porte sur l'étude et la réalisation d'une source laser à fibre dopée à l'ytterbium à verrouillage de modes passif par rotation non-linéaire de la polarisation. Nous avons étudié les différents régimes de fonctionnement du laser en cavité en anneau unidirectionnelle contenant un isolateur optique inséré entre deux lames de phase demi-onde. Nous montrons, qu'en fonction de l'orientation respective des deux lames de phase, le laser peut fonctionner en régime continu, en régime à verrouillage de modes ou en régime déclenché.This work deals with the study of an ytterbium-doped double-clad fibre laser side-pumped using the v-groove technique operating in different regimes around 1.06mm. In the first part, we present the last developments in the field of high-power diode-pumped fibre laser including the double-clad structures and the pumping techniques. In the second part we investigate experimentally the dynamics of a high power ytterbium-doped double-clad fibre laser in various optical configurations. Different self-pulsing regimes are identified resulting from third-order non-linear effects. The third part is devoted to the study and the realisation of a passively mode-locked ytterbium-doped fibre laser using the non-linear polarisation rotation technique.ROUEN-BU Sciences (764512102) / SudocROUEN-BU Sciences Madrillet (765752101) / SudocSudocFranceF

Extreme events and heavy-tailed distributions in an Yb-doped fiber laser self-pulsed by stimulated Brillouin scattering

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Extreme events and heavy-tailed distributions in an Yb-doped fiber laser self-pulsed by stimulated Brillouin scattering

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All-optical real-time tracking of high-speed phenomena (Conference Presentation)

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Spectral correlations in a fiber-optical parametric oscillator

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