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Dive into the research topics where Ewelina Obrzud is active.

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Featured researches published by Ewelina Obrzud.


Laser Resonators, Microresonators, and Beam Control XX | 2018

Temporal cavity solitons in synchronously driven Fabry-Perot microresonators

Ewelina Obrzud; Victor Brasch; Steve Lecomte; Tobias Herr

Temporal dissipative solitons in continuous-wave (CW) laser-driven Kerr-nonlinear microresonators have led to the generation of highly-coherent optical frequency combs and ultra-short optical pulses with repetition rates in excess of 10 GHz. Applications of such sources include optical telecommunication, microwave signal generation and optical spectroscopy. Here, a novel nonlinear optical Fabry-Perot microresonator is synchronously driven by picosecond laser pulses (instead of a CW laser) resulting in the formation of temporal dissipative solitons at 10 GHz repetition rate. As opposed to the conventional CW-driven case, single or multiple solitons form deterministically ‘on-top’ of the resonantly enhanced driving pulses, which significantly increases conversion efficiency. The solitons lock to the driving pulse, which enables stable operation and coherent actuation of the solitons’ repetition rate and carrier-envelope offset frequency. The Fabry-Perot microresonator with 10 GHz free-spectral range is based on a short length of standard optical fiber whose end-facets are coated with dielectric Bragg mirrors. Mounted inside a fiber-optical ferrule, the resonator can be interfaced directly with other fiber optical components. While being equivalent to whispering-gallery mode and ring-type resonators regarding nonlinear optical phenomena, the Fabry-Perot microresonator allows for straightforward design of group velocity dispersion, coupling ratio and nonlinearity via choice of fiber and dielectric mirrors. In summary, the presented results links the fields of CW driven microresonators, synchronously driven optical parametric oscillators as well as pulsebased non-resonant supercontinuum generation. Amongst others, they open new perspectives for microresonator-based frequency combs generation and for nonlinear photonics driven by temporally and spectrally structured light.


european quantum electronics conference | 2017

Temporal dissipative solitons in a fabry-pérot microresonator driven by optical pulses

Ewelina Obrzud; Steve Lecomte; T. Herr

Nonlinear optical microresonators driven by continuous-wave (CW) lasers have enabled a variety of novel applications and phenomena including the generation of optical frequency combs [1], [2]. Particularly the formation of femtosecond temporal dissipative Kerr-cavity soliton pulses [3], [4] has recently attracted significant attention as it enables the generation of ultra-short optical pulse as well as low noise frequency combs with tens of Gigahertz repetition rates.


conference on lasers and electro optics | 2017

In-fibre Fabry-Pérot microresonator with 100 million Q-factor

Ewelina Obrzud; Steve Lecomte; Tobias Herr

Ring-type and whispering-gallery mode microresonators combine strong light confinement with high optical non-linearity to give rise to and enable efficient nonlinear optical parametric frequency conversion processes [1], stimulated Brillouin and Raman scattering.


conference on lasers and electro optics | 2017

In-Fiber Fabry-Perot Microresonator with 100 Million Q-Factor

Ewelina Obrzud; Steve Lecomte; Tobias Herr

A single-mode, 100 million Q-factor, Kerr-nonlinear Fabry-Pérot microresonator with 10 GHz free-spectral range is fabricated. The resonators group velocity dispersion, coupling ratio and nonlinearity can be engineered via choice of fibre and dielectric Bragg reflection coating.


Nature Photonics | 2017

Temporal solitons in microresonators driven by optical pulses

Ewelina Obrzud; Steve Lecomte; Tobias Herr


arXiv: Optics | 2018

Broadband near-infrared astronomical spectrometer calibration and on-sky validation with an electro-optic laser frequency comb

Ewelina Obrzud; M. Rainer; A. Harutyunyan; Bruno Chazelas; Massimo Cecconi; Adriano Ghedina; Emilio Molinari; Stefan Kundermann; Steve Lecomte; F. Pepe; F. Wildi; F. Bouchy; Tobias Herr


arXiv: Optics | 2018

Frequency comb up- and down-conversion in a synchronously-driven

Simon J. Herr; Victor Brasch; Jan Szabados; Ewelina Obrzud; Yuechen Jia; Steve Lecomte; K. Buse; Ingo Breunig; Tobias Herr


conference on lasers and electro optics | 2017

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Ewelina Obrzud; Steve Lecomte; Tobias Herr


arXiv: Optics | 2017

optical microresonator.

Ewelina Obrzud; M. Rainer; A. Harutyunyan; M. H. Anderson; M. Geiselmann; Bruno Chazelas; Stefan Kundermann; Steve Lecomte; Massimo Cecconi; Adriano Ghedina; Emilio Molinari; F. Pepe; F. Wildi; F. Bouchy; Tobias J. Kippenberg; Tobias Herr

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Steve Lecomte

École Polytechnique Fédérale de Lausanne

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Tobias Herr

École Polytechnique Fédérale de Lausanne

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F. Pepe

University of Geneva

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F. Wildi

University of Geneva

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Stefan Kundermann

Swiss Center for Electronics and Microtechnology

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Victor Brasch

École Polytechnique Fédérale de Lausanne

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