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AUTHOR
Alexandre Parriaux
Frequency comb generation by electro-optic modulation and applications
The work presented in this thesis relates the development of a dual frequency comb spectrometer based on the electro-optic modulation of a continuous wave laser, and its utilisation for spectroscopic applications in the near- and mid-infrared.Since their discovery in the 1960s, frequency combs have revolutionised the physics, especially in metrology but also in spectroscopy, which lead to the Nobel Prize in Physics in 2005. In this domain of applications, dual frequency comb spectrometers are known to be complex to develop and use. A possibility to bypass these constraints is to build the spectrometer with electro-optic modulators. This particular architecture makes the experimental setup e…
Elargissement spectral d’impulsions par ondes de choc dispersives dans les fibres optiques
National audience; Nous étudions l’élargissement spectral induit par ondes de choc dispersives d’impulsions générées par modulation électro-optique dans une fibre optique en dispersion normale.
Intense Stimulated Raman Scattering in CO2-filled Hollow Core Fiber
International audience; Frequency combs are of constant significant interest for their use in diverse areas of physics ranging from metrology to biomedical and environmental spectroscopy. One of interesting techniques to obtain multi-octave comb-like optical spectra is based on generation of higher-order stimulated Raman scattering (SRS) in a hollow-core photonic crystal fibers (HC-PCFs) filled with hydrogen gas [1]. The ability of these types of fibers to strongly confine together gases and laser pump, while keeping their interaction length over several meters, has allowed to reduce, by six-order of magnitude, the laser power in comparison to previous equivalent techniques using a gas cell…
Kerr beam self-cleaning in the telecom band
Multimode graded index (GRIN) fibers received a renewed interest in recent years, in particular for the development of new laser sources [1]. In many cases, the use of GRIN fibers is limited by multimodal propagation, leading to a spatially modulated intensity distribution (speckles) at the fiber output. Recent studies have found that quasi-single mode propagation can be recovered in GRIN fibers by the so-called Kerr self-cleaning effect [2]. It consists in the spontaneous recovery of the spatial beam quality, without any frequency shift [2] (as opposed to, e.g., Raman beam self-cleaning [3]). This nonlinear process was only observed so far at laser wavelengths around 1 μm, for peak power l…
Higher-order dispersion parameters management in highly nonlinear photonic crystal fibers for far-detuned frequency conversion
International audience; In this communication we present results dealing with the precise management of dispersion coefficients into two highly nonlinear fiber structures (a tapered PCF and an all-solid fiber) for far-detuned frequency conversion towards 2µm.
Si and Si-rich silicon-nitride waveguides for optical transmissions and nonlinear applications around 2 µm
We show that cm-long silicon and silicon-rich silicon nitride waveguides with subwavelength transverse dimensions can efficiently sustain high-speed transmissions at 2 μm. We report the transmission of a 10 Gbit/s signal with negligible power penalty. Parametric conversion in both continuous and pulsed pump regimes is also demonstrated, as well as the spectral broadening of picosecond pulses.