Dr. Peter Tønning Profile

Dr. Peter Tønning

at Aarhus Univ

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Publications (2)

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Proceedings Article | 5 March 2021 Paper

Walk-off effect in nonlinear crystals suitable for UVC generation

Nicolas Volet, Emil Ulsig, Iterio Degli-Eredi, Peter Tønning, Eric Stanton

Proceedings Volume 11670, 116701O (2021) https://doi.org/10.1117/12.2581674

KEYWORDS: Nonlinear crystals, Semiconductor lasers, Crystals, Ultraviolet radiation, Sum-frequency generation, Refractive index, Polarization

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Lasers emitting in the ultraviolet C-band (UVC) have recently attracted considerable attention for germicidal purposes. Combining diode lasers with nonlinear crystals used for second-harmonic generation (SHG) is a promising approach thanks to their relatively low cost, small footprint and long lifetime. The output power in the UVC is limited by the output power of the diode lasers and by the conversion efficiency in the nonlinear crystal. This work compares the SHG conversion efficiency using a bulk approach to values expected using guided modes in waveguides. It discusses the phase-matching (PhM) condition for different input polarizations, the effective nonlinearity, and the Poynting vector walk-off. This last effect is particularly detrimental as it reduces the effective length for the nonlinear interaction in bulk, which ultimately limits the conversion efficiency towards the UVC. Values for the walk-off angle are computed for barium borate (BBO), and a comparison is provided with other nonlinear crystals.

Proceedings Article | 5 March 2021 Presentation + Paper

Novel computational model for simulating integrated optoelectronic oscillators

Iterio Degli-Eredi, Peter Tønning, Nicolas Volet, Martijn J. Heck

Proceedings Volume 11685, 116850L (2021) https://doi.org/10.1117/12.2582701

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Optoelectronic oscillators (OEOs), realized on photonic integrated circuits (PICs), have the potential of producing millimeter-wave (mm-wave) clock signals with lower timing jitter and higher operating frequencies than their all-electronic counterparts. To have a proper design tool for these PIC-based OEOs, a novel, computationally efficient time-domain circuit simulation model is presented. It relies on describing the propagation, filtering and mixing of the spectral contents of the circulating optical and mm-waves. This work specifically targets OEOs consisting of building blocks offered by commercial PIC platforms, such as high-speed modulators, high-Q filters, semiconductor optical amplifiers (SOAs) and high-speed photodetectors (PDs). The model can simulate a wide range of OEO topologies, including OEOs that use an array of SOAs and PDs to boost the generated mm-wave signal power, or OEOs that employ modulator configurations other than the often-used Mach-Zehnder devices. The model also takes into account the saturation effects and noise of the SOAs and PDs, as well as all the propagation losses and delays experienced by the optical and mm-waves, which allows for investigating the effects of fabrication errors. As a test case, this model is applied to a proposed design of a hybridly integrated 20-GHz OEO, which relies on a combination of indium phosphide (InP) and silicon nitride (SiN) based PICs, using realistic parameters representative for these platforms. Timing jitters of almost 100 fs (10 kHz { 10 MHz) are demonstrated by optimising the SOA gain and the laser frequency detuning from the high-Q filter resonances.

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