Dr. Michael Geiselmann Profile

Dr. Michael Geiselmann

Managing Director at LIGENTEC SA

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Publications (9)

Proceedings Article | 20 June 2024 Presentation

Increasing Kerr-comb efficiency through pump recycling in a chip-integrated gain medium

Bastian Ruhnke, Mahmoud Gaafar, Thibault Wildi, Markus Ludwig, Alexander Ulanov, Thibault Voumard, Kai Wang, Milan Sinobad, Jan Lorenzen, Henry Francis, Jose Carreira, Michael Geiselmann, Neetesh Singh, Franz Kärtner, Sonia Garcia-Blanco, Tobias Herr

Proceedings Volume PC13004, PC130040O (2024) https://doi.org/10.1117/12.3023271

KEYWORDS: Solitons, Continuous wave operation, Microresonators, Crystals, Windows, Optical computing, Nonlinear crystals, Lutetium, Laser interferometry, Laser frequency

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Proceedings Article | 19 June 2024 Presentation

Chip integrated ultrafast pulse amplification

Mahmoud A. Gaafar, Markus Ludwig, Kai Wang, Thibault Wildi, Thibault Voumard, Milan Sinobad, Jan Lorenzen, Henry Francis, Shuangyou Zhang, Toby Bi, Pascal Del’haye, Michael Geiselmann, Neetesh Singh, Franz Kärtner, Sonia García-Blanco, Tobias Herr

Proceedings Volume PC13012, (2024) https://doi.org/10.1117/12.3017600

KEYWORDS: Ultrafast phenomena, Femtosecond phenomena, Waveguides, Photonics, Dispersion, Wave propagation, Semiconductors, Optical amplifiers, Integrated photonics, Integrated optics

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Proceedings Article | 12 March 2024 Presentation

Combining low loss SiN photonics with integration of active components

Michael Geiselmann

Proceedings Volume PC12892, PC128920B (2024) https://doi.org/10.1117/12.3001336

KEYWORDS: Silicon nitride, Quantum photonics, Photonic integrated circuits, Waveguides, Tunable lasers, Supercontinuum generation, Silicon, Quantum light generation, Optical resonators, Microresonators

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Proceedings Article | 17 March 2023 Presentation

Low loss SiN photonic integrated circuits: from prototype to volume

Michael Geiselmann

Proceedings Volume PC12425, PC1242508 (2023) https://doi.org/10.1117/12.2647172

KEYWORDS: Photonic integrated circuits, Prototyping, Waveguides, Silicon, Semiconductor lasers, Tunable lasers, Resonators, Quantum computing, Laser applications, Channel projecting optics

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Proceedings Article | 11 June 2021 Open Access

Photonics-based ultra-low phase noise X-band microwave generation

L. Karlen, N. Torcheboeuf, S. Kundermann, T. Herr, E. Obrzud, V. Brasch, F. Schaub, H. Meier, A. Stroganov, M. Geiselmann, S. Lecomte

Proceedings Volume 11852, 1185246 (2021) https://doi.org/10.1117/12.2599641

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Proceedings Article | 11 June 2021 Open Access

Space spectrograph design to calibration

Rémi Rivière, Xavier Gnata, Claude Coatantiec, Sebastian Schmid, Flavien Albano, Toby Bi, Pascal Del’haye, Tatiana Burikova, Davide Sacchetto, Anton Stroganov, Michael Geiselmann, Stefan Paus

Proceedings Volume 11852, 118524A (2021) https://doi.org/10.1117/12.2599649

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Proceedings Article | 5 March 2021 Presentation

Low-loss integrated silicon nitride photonics platform

Michael Geiselmann

Proceedings Volume 11689, 116890D (2021) https://doi.org/10.1117/12.2577588

KEYWORDS: Silicon, Silicon photonics, Photonics, Waveguides, Resonators, Nonlinear optics, Integrated circuits, Wave propagation, Spectroscopy, Silicon films

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Proceedings Article | 9 March 2020 Presentation

Continuous scanning of a dissipative Kerr micro-resonator soliton comb (Conference Presentation)

Naoya Kuse, Tomohiro Tetsumoto, Gabriele Navickaite, Michael Geiselmann, Martin Fermann

Proceedings Volume 11266, 112660H (2020) https://doi.org/10.1117/12.2544625

KEYWORDS: Solitons, Microresonators, Spectroscopy, Continuous wave operation, Absorption, Spectral resolution, Terahertz radiation, Silicon photonics, Electrooptic modulators, Palladium

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Proceedings Article | 3 August 2016 Presentation

Chipscale optical frequency combs: from soliton physics to coherent communication (Conference Presentation)

Victor Brasch, Michael Geiselmann, Tobias Herr, Grigoriy Lihachev, Martin H. Pfeiffer, Michael Gorodetsky, Tobias Kippenberg

Proceedings Volume 9900, 99000Z (2016) https://doi.org/10.1117/12.2231293

KEYWORDS: Frequency combs, Solitons, Resonators, Dispersion, Waveguides, Microresonators, Physics, Computer simulations, Optical communications, Silicon

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In our experiment we use silicon nitride waveguides embedded in silicon dioxide on a silicon chip. The cross section of the waveguide is approximately 1.8µm width by 0.8µm height and the ring resonator has a radius of 120µm. This resonator is coupled to a bus waveguide that is used to couple the continuous wave pump light into the resonator and the light from the resonator out again. The pump laser is an amplified diode laser which provides around 2W of pump power in the bus waveguide on the photonic chip. If the pump light is in resonance with one of the resonances of the resonator we can generate a frequency comb from the pump light via the Kerr nonlinearity of the material. The spacing in between the lines of the frequency comb is close to the free spectral range of the resonator, which is 190 GHz for the resonator used. By tuning the pump laser through the resonance and modulating the power of the pump light we can achieve a stable state with a pulsed-shape waveform circulating inside the microresonator. These states are known as dissipative Kerr soliton states and they are solutions to the Lugiato-Lefever equation, which describes the nonlinear physics of the system. So far they had been experimentally demonstrated in fiber-ring cavities as well as crystalline microresonators. The main benefits of these states for Kerr frequency combs is that they allow for low-noise but broadband frequency combs with low modulation in the spectrum. In our case we report a 3-dB bandwidth of 10THz which is equivalent to sub-30fs pulses inside the resonator. Because of the chosen geometry of the waveguide cross section we also observe an effect which is caused by higher-order dispersion. Higher-order dispersion are terms that describe the dispersion beyond the quadratic group velocity dispersion. In order for dissipative Kerr solitons to form, anomalous group velocity dispersion is required. If higher-order terms are present as well, the soliton can still exist but additional dynamics come into play resulting in so called soliton Cherenkov radiation or a dispersive wave. In our measured spectrum this feature can be easily identified as a local maximum offset from the pump wavelength. In the time domain the soliton Cherenkov radiation manifests itself as an oscillating tail that is attached to the soliton pulse inside the microresonator. Using simulated values for the dispersion and coupled-mode equations to numerically simulate the physics inside the microresonator we can achieve a very good agreement between the experimentally observed and the simulated spectrum. In order to demonstrate that our frequency comb can be used for metrological applications we implement a full stabilization of the frequency comb and achieve a relative stability of 1e-15. Additionally we use the large bandwidth of 2/3 of an octave to implement a 2f-3f-scheme in order to monitor the carrier envelope offset of the frequency comb in a self-referenced manner. In summary we have observed for the first time a soliton-based, broadband frequency comb in integrated microresonators. These frequency combs are perfectly suited for spectroscopy and data communication applications.

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