TY  - CONF
AU  - Ruhnke, Bastian
AU  - Mahmoud, Gafaar
AU  - Wildi, Thibault
AU  - Ludwig, Markus
AU  - Ulanov, Alexander
AU  - Voumard, Thibault
AU  - Wang, Kai
AU  - Sinobad, Milan
AU  - Lorenzen, Jan
AU  - Francis, Henry
AU  - Carreira, Jose
AU  - Singh, Neetesh Kumar
AU  - Kärtner, Franz
AU  - Garcia-Blanco, Sonia M.
AU  - Herr, Tobias
TI  - Increasing Kerr-comb efficiency through pump recycling in a chip-integrated gain medium
PB  - Deutsches Elektronen Synchrotron DESY
M1  - PUBDB-2024-01414
PY  - 2024
AB  - 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.
T2  - SPIE Photonics Europe
CY  - 7 Apr 2024 - 11 Apr 2024, Strasbourg (France)
Y2  - 7 Apr 2024 - 11 Apr 2024
M2  - Strasbourg, France
LB  - PUB:(DE-HGF)6
UR  - https://bib-pubdb1.desy.de/record/605327
ER  -