Publications de Clemens Herkommer

Laser-guided lightning

Farhad Rachidi-Haeri, Marcos Rubinstein, Jean-Pierre Wolf, Pierre Walch, Clemens Herkommer, Amirhossein Mostajabi, Thomas Produit, Antonio Sunjerga, Victor Moreno

Lightning discharges between charged clouds and the Earth’s surface are responsible for considerable damages and casualties. It is therefore important to develop better protection methods in addition to the traditional Franklin rod. Here we present the fir ...

Nature Publishing Group2023

The laser lightning rod project

Farhad Rachidi-Haeri, Marcos Rubinstein, Jean-Pierre Wolf, Pierre Walch, Mohammad Azadifar, Clemens Herkommer, Amirhossein Mostajabi, Thomas Produit, Antonio Sunjerga

Lightning is highly destructive due to its high power density and unpredictable character. Directing lightning away would allow to protect sensitive sites from its direct and indirect impacts (electromagnetic perturbations). Up to now, lasers have been una ...

2021

Laser lightning rod and artificial fog dissipation

Farhad Rachidi-Haeri, Marcos Rubinstein, Jean-Pierre Wolf, Pierre Walch, Mohammad Azadifar, Clemens Herkommer, Amirhossein Mostajabi, Thomas Produit, Antonio Sunjerga, Victor Moreno

IEEE2021

Parallel gas spectroscopy using mid-infrared supercontinuum from a single Si3N4 waveguide

Tobias Kippenberg, Camille Sophie Brès, Davide Grassani, Clemens Herkommer, Eirini Tagkoudi

Efficient third-order nonlinear optical processes have been successfully integrated on silicon nitride (Si3N4) waveguides. In particular, owing to Si3N4 wide transparency window spanning from the visible to the middle-infrared (mid-IR), efficient mid-IR di ...

2020

Mid infrared gas spectroscopy using efficient fiber laser driven photonic chip-based supercontinuum

Tobias Kippenberg, Camille Sophie Brès, Hairun Guo, Davide Grassani, Clemens Herkommer, Eirini Tagkoudi

Directly accessing the middle infrared, the molecular functional group spectral region, via supercontinuum generation processes based on turn-key fiber lasers offers the undeniable advantage of simplicity and robustness. Recently, the assessment of the coh ...

Nature Research2019

Mid-infrared frequency comb via coherent dispersive wave generation in silicon nitride nanophotonic waveguides

Tobias Kippenberg, Martin Hubert Peter Pfeiffer, Camille Sophie Brès, Adrien Billat, Hairun Guo, Davide Grassani, Clemens Herkommer, Chuankun Zhang, Wenle Weng

Mid-infrared optical frequency combs are of significant interest for molecular spectroscopy due to the large absorption of molecular vibrational modes on the one hand, and the ability to implement superior comb-based spectroscopic modalities with increased ...

Nature Publishing Group2018

Efficient mid-infrared dispersive wave generation in dispersion-engineered Si3N4 waveguides pumped at 2 μm

Tobias Kippenberg, Camille Sophie Brès, Hairun Guo, Davide Grassani, Clemens Herkommer, Eirini Tagkoudi

We demonstrate efficient generation of mid-infrared dispersive wave at 3.5 m in a Si3N4 waveguide pumped by a 2090nm femtosecond mode-locked fiber laser. The 8% maximum efficiency allows for a milliwatt-level average power mid-infrared pulse. ...

2018

Double inverse nanotapers for efficient light coupling to integrated photonic devices

Michail Zervas, Tobias Kippenberg, Martin Hubert Peter Pfeiffer, Michael Wolfgang Geiselmann, Hairun Guo, Junqiu Liu, Clemens Herkommer, Arslan Sajid Raja

2018

Photonic Damascene Process for Low-Loss, High-Confinement Silicon Nitride Waveguides

Michail Zervas, Tobias Kippenberg, Martin Hubert Peter Pfeiffer, Michael Wolfgang Geiselmann, Clemens Herkommer

2018

Octave-spanning dissipative Kerr soliton frequency combs in Si3N4 microresonators

Michail Zervas, Tobias Kippenberg, Martin Hubert Peter Pfeiffer, Erwan Guillaume Albert Lucas, Maxim Karpov, Hairun Guo, Junqiu Liu, Clemens Herkommer

Octave-spanning, self-referenced frequency combs are applied in diverse fields ranging from precision metrology to astrophysical spectrometer calibration. The octave-spanning optical bandwidth is typically generated through non-linear spectral broadening o ...

Optical Soc Amer2017

A chip-based silicon nitride platform for mid-infrared nonlinear photonics

Michail Zervas, Tobias Kippenberg, Martin Hubert Peter Pfeiffer, Camille Sophie Brès, Adrien Billat, Hairun Guo, Davide Grassani, Clemens Herkommer

We developed a chip-based silicon nitride platform with thick waveguides (> 2 mm) that overcomes the usual fabrication limitation. We demonstrate both microresonator frequency comb generation at 2:5 mm and supercontinuum generation extending beyond 4:0 mm ...

OSA Publishing2017

A chip-based silicon nitride platform for mid-infrared nonlinear photonics

Michail Zervas, Tobias Kippenberg, Martin Hubert Peter Pfeiffer, Camille Sophie Brès, Adrien Billat, Hairun Guo, Davide Grassani, Clemens Herkommer

We developed a chip-based silicon nitride platform with thick waveguides (> 2 mm) that overcomes the usual fabrication limitation. We demonstrate both microresonator frequency comb generation at 2:5 mm and supercontinuum generation extending beyond 4:0 mm ...

2017