Routes to spatiotemporal chaos in Kerr optical frequency combs

We investigate the various routes to spatiotemporal chaos in Kerr optical frequency combs obtained through pumping an ultra-high quality whispering-gallery mode resonator with a continuous-wave laser. The Lugiato-Lefever model is used to build bifurcation diagrams with regards to the parameters that are externally controllable, namely, the frequency and the power of the pumping laser. We show that the spatiotemporal chaos emerging from Turing patterns and solitons display distinctive dynamical features. Experimental spectra of chaotic Kerr combs are also presented for both cases, in excellent agreement with theoretical spectra

Retrieving the Complex Intracavity Pump Field of a Kerr Comb from the Through Port Data

A method of retrieving the complex intracavity pump field from the through port is proposed, and verified through characterizing the time-domain waveform of a mode-locked comb related to dark soliton formation in a normal-dispersion microresonator.Comment: 2 pages, 6 figure

Self-referencing a continuous-wave laser with electro-optic modulation

We phase-coherently measure the frequency of continuous-wave (CW) laser light by use of optical-phase modulation and f-2f nonlinear interferometry. Periodic electro-optic modulation (EOM) transforms the CW laser into a continuous train of picosecond optical pulses. Subsequent nonlinear-fiber broadening of this EOM frequency comb produces a supercontinuum with 160 THz of bandwidth. A critical intermediate step is optical filtering of the EOM comb to reduce electronic-noise-induced decoherence of the supercontinuum. Applying f-2f self-referencing with the supercontinuum yields the carrier-envelope offset frequency of the EOM comb, which is precisely the difference of the CW laser frequency and an exact integer multiple of the EOM pulse repetition rate. Here we demonstrate absolute optical frequency metrology and synthesis applications of the self-referenced CW laser with <5E-14 fractional accuracy and stability.Comment: 8 pages, 4 figure

Habiter en zone inondable : l’Arbresle à l’aune d’une expansion lyonnaise

This project is in a context of intense change, a significant demographic change in the Rhône-Alpes region is expected around 2040, coupled with the problems of flooding and construction risk areas that we can’t ignore. The case of l’Arbresle thus at the heart of these major themes. The objective here is to support the transformation of this municipality while allowing people to reconnect with the water, hitherto perceived negatively, because of fluctuations and flooding which exposes people. This graduation project proposes new usages, furnishings, amenities and offering to draw water out for use as a real territorial object, while reducing risk and enabling people to reconnect with the river which becomes the territory identity.Ce projet s’inscrit dans un contexte de fortes mutations, une évolution démographique conséquente en région Rhône-Alpes étant prévue à l’horizon 2040, couplée à des problématiques d’inondation et de construction en zones à risques que nous ne pouvons ignorer. Le cas de l’Arbresle est ainsi inscrit au cœur de ces grandes thématiques. L’objectif poursuivi ici est donc d’accompagner la mutation de cette commune tout en permettant aux habitants de renouer avec l’eau, élément jusqu’alors perçu de manière négative, du fait des fluctuations et crues auxquelles il expose les populations. Ce projet de fin d’études propose donc de nouveaux usages, aménagements, et aménités qui proposent de tirer parti de l’eau afin de l’utiliser comme un véritable objet territorial, tout en diminuant le risque et en permettant aux habitants de renouer avec le cours d’eau qui devient ainsi l’identité même du territoire

Superlocalization reveals long-range synchronization of vibrating soliton molecules

We implement a super-localization method in the time domain that allows the observation of the external motion of soliton molecules in a fiber ring cavity laser with unprecedented accuracy. In particular, we demonstrate the synchronization of two oscillating soliton molecules separated by several nanoseconds, with inter-molecules oscillations following the same pattern as the intramolecular motion of the individual molecules. These experimental findings indicate an interplay between the different interaction mechanisms that coexist inside the laser cavity, despite their very different characteristic ranges, timescales, strengths, and physical origins.Comment: This work was supported by the French "Investissements d'Avenir" program / project ISITE-BFC (contract ANR-15-IDEX-0003), and by the Agence Nationale de la Recherche (ANR) project "CoMuSim" (contract ANR-17-CE24-0010-01

Temporal dynamics of Kerr frequency combs in whispering-gallery mode resonators

International audienceBased on a modal description of the evolution of the mode's amplitude in a whispering-gallery mode resonator, we numerically study the generation of Kerr combs. We show that a stable primary comb appear for pump power slightly above threshold, enabling potential applications in metrology. For high input power however, chaotic signals are observed

On phase locking phenomena in Kerr combs

International audienceBased on a modal description of the evolution Kerr combs in a whispering-gallery mode resonator, we numerically investigate the phase bhavior of the different spectral lines of the spectrum. We show that a stable phase relation exists between adjacent modes in primary combs. This result is of great interest for metrological applications where one phase noise is an issue. For high input power however, chaotic signals are observed