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20 June 2024 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
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Proceedings Volume PC13004, Nonlinear Optics and its Applications 2024; PC130040O (2024) https://doi.org/10.1117/12.3023271
Event: SPIE Photonics Europe, 2024, Strasbourg, France
Abstract
Continuous-wave (CW) laser-driven integrated Kerr microresonators enable broadband optical frequency combs with high repetition rates and low threshold power, in a compact footprint. A drawback of such microcombs is the low conversion efficiency from the pump laser to the comb lines, which is often in the few percent range or below. Here, complementing previously demonstrated approaches to increase conversion efficiency, we demonstrate a novel approach that leverages a chip-based rare-earth (Tm3+)-doped optical gain medium to boost the pump-to-comb conversion efficiency by more than one order of magnitude. Importantly, the gain medium does not require an additional pump laser, but recycles residual pump light from the Kerr-comb: the CW pump of the Kerr-comb (1610 nm) coincides with the pump wavelength of the on-chip gain medium, allowing unconverted pump power to be absorbed and transferred to the comb lines within gain window (1700 - 1900 nm). This enables a new class of highly efficient Kerr-combs for applications e.g. in data centers and optical computing.
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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, and Tobias Herr "Increasing Kerr-comb efficiency through pump recycling in a chip-integrated gain medium", Proc. SPIE PC13004, Nonlinear Optics and its Applications 2024, PC130040O (20 June 2024); https://doi.org/10.1117/12.3023271
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KEYWORDS
Solitons
Continuous wave operation
Crystals
Microresonators
Laser frequency
Laser interferometry
Lutetium
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