Abstract
Periodically poled lithium niobate (PPLN) waveguides are a powerful platform for efficient wavelength conversion. Conventional PPLN converters, however, typically require long device lengths and high pump powers due to the limited nonlinear interaction strength. Here we use a nanostructured PPLN waveguide to demonstrate an ultrahigh normalized efficiency of 2600%/W − cm2 for second-harmonic generation of 1.5 μm radiation, more than 20 times higher than that in state-of-the-art diffused waveguides. This is achieved by a combination of sub-wavelength optical confinement and high-fidelity periodic poling at a first-order poling period of 4 μm. Our highly integrated PPLN waveguides are promising for future chip-scale integration of classical and quan-tum photonic systems.
| Original language | English |
|---|---|
| Pages (from-to) | 1438-1441 |
| Journal | Optica |
| Volume | 5 |
| Issue number | 11 |
| Online published | 7 Nov 2018 |
| DOIs | |
| Publication status | Published - 20 Nov 2018 |
Research Keywords
- REVERSE PROTON-EXCHANGE
- 2ND-HARMONIC GENERATION
- THIN-FILM
- NONLINEARITIES
- RESONATORS
- CONVERTERS
- DEVICES
- LINBO3
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- © 2018 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.