Ultrabroadband Integrated Electro-Optic Frequency Comb in Lithium Tantalate
Chip-scale optical frequency combs have unlocked a wide range of applications, from coherent sensing, low-noise microwave synthesis to massively parallel coherent optical telecommunications and computations. Recent advances in thin-film lithium niobate (LiNbO<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf>) have enabled integrated electro-optic combs (EO combs) [1], [2]. However, current lithium niobate EO combs is limited by birefringence-induced mode-crossings and the inefficient microwave power usage, limiting the maximum attainable bandwidth below 150nm. In this work, we address both challenges by co-designing monolithic integrated microwave resonators with lithium tantalate (LiTaO<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf>) photonics integrated circuits [3], which has 17 times lower birefringence. We demonstrated a >450nm span EO comb with 30GHz repetition rate.
Authors
- Wil Kao (ORCID: https://orcid.org/0000-0002-8593-1466)
- Johann Riemensberger (ORCID: https://orcid.org/0000-0002-3468-6501)
- Chengli Wang (ORCID: https://orcid.org/0009-0003-2894-6439)
- Junyin Zhang (ORCID: https://orcid.org/0000-0001-7597-8941)
- Mikhail Churaev (ORCID: https://orcid.org/0000-0002-1864-3288)
- Connor Denney
- Terence Blésin (ORCID: https://orcid.org/0000-0003-3468-5493)
- Gabriel Santamaría-Botello (ORCID: https://orcid.org/0000-0003-4736-0030)
- Jianqi Hu (ORCID: https://orcid.org/0000-0002-2018-253X)
- Tobias J. Kippenberg (ORCID: https://orcid.org/0000-0002-3408-886X)
- Xin Ou (ORCID: https://orcid.org/0000-0002-0316-9958)
- Zihan Li (ORCID: https://orcid.org/0000-0002-6748-0665)
- Nikolai Kuznetsov (ORCID: https://orcid.org/0000-0002-5609-5331)
- Grigory Lihachev
Institutions
- Colorado School of Mines (US)
- Shanghai Institute of Microsystem and Information Technology (CN)
- École Polytechnique Fédérale de Lausanne (CH)
Publication Details
- Published
- 2025-06-23
- DOI
- https://doi.org/10.1109/cleo/europe-eqec65582.2025.11110420
- Citations
- 1
- Primary Topic
- Advanced Fiber Laser Technologies
- Type
- article
- Field-Weighted Citation Impact
- 1.25
Funders
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung