https://doi.org/10.1051/epjconf/202226601005
Tantalum pentoxide micro-resonators for frequency comb generation
1 School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ
2 Aquark Technologies, Unit 2, Abbey Enterprise Centre, Premier Way, Abbey Park Industrial Estate, Romsey, Hampshire, SO51 9AQ
3 National Physical Laboratory, Hampton Rd, Teddington, TW11 0LW
4 Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ
* e-mail: J.Daykin@soton.ac.uk
Published online: 13 October 2022
We present the design, fabrication, simulation and initial characterisation of tantalum pentoxide (Ta2O5) optical waveguides and micro-ring resonators for the purpose of supercontinuum and frequency comb generation. Spectral broadening results are presented for linear Ta2O5 waveguides for a range of central pump wavelengths between 900 nm and 1500 nm. These results are used as the basis for the dispersion engineering and development of Ta2O5 micro-ring resonators. The losses for sputtered and TEOS PECVD deposited SiO2 top cladded waveguides are characterised using a Fabry-Pérot loss measurement set-up. A solver based on the Lugiato-Lefever equation is presented and used to simulate the expected emission from the Ta2O5 micro-ring resonators. Promising initial experimental results show critical coupling and a Q-factor of 3.7×104.
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