High-efficiency second-harmonic generation in reverse-polarization dual-layer lithium niobate waveguides
Second-harmonic (SH) generation is an important way to generate short-wavelength light sources. Thin-film lithium niobate (TFLN) resonators and waveguides featuring tight light confinement are flexible to realize mode- or quasi-phase-matching (MPM or QPM) and thus efficient SH generation. Here, we report an efficient SH with an absolute conversion efficiency of 45% in a reverse-polarized double-layer TFLN waveguide. Such a high conversion efficiency without periodic poling was realized with the pump of 67 mW in the 1550 nm band, benefiting from the employment of the largest nonlinear coefficient d<sub>33</sub> and the significant nonlinear interaction of the fundamental transverse electric (TE) mode and the first-order TE mode in the vertical direction. This work paves the way toward on-chip integrated nonlinear optics in terms of harmonic generation and quantum light sources across the telecom and visible bands.
Authors
- Feng Gao (ORCID: https://orcid.org/0000-0002-8853-0123)
- Li Zhang (ORCID: https://orcid.org/0000-0002-1108-9413)
- Jingjun Xu (ORCID: https://orcid.org/0000-0002-2509-0175)
- Guoquan Zhang (ORCID: https://orcid.org/0000-0001-6130-5316)
- Rui Ma (ORCID: https://orcid.org/0000-0002-0242-9797)
- Bo Fang (ORCID: https://orcid.org/0000-0001-9909-1317)
- Zhenzhong Hao (ORCID: https://orcid.org/0000-0001-9614-1761)
- Xiao Wu (ORCID: https://orcid.org/0009-0003-5597-067X)
Institutions
- Nankai University (CN)
Publication Details
- Journal
- Optics Letters
- Published
- 2024-10-03
- DOI
- https://doi.org/10.1364/ol.538240
- Citations
- 5
- Primary Topic
- Photonic and Optical Devices
- Type
- article
- Field-Weighted Citation Impact
- 1.04
Funders
- National Natural Science Foundation of China
- Natural Science Foundation of Tianjin City
- Higher Education Discipline Innovation Project
- National Key Research and Development Program of China