Ultrahigh-efficiency wavelength conversion in nanophotonic periodically poled lithium niobate waveguides

Cheng Wang, Carsten Langrock, Alireza Marandi, Marc Jankowski, Mian Zhang, Boris Desiatov, Martin M. Fejer, Marko Lončar

Research output: Contribution to journalLetterpeer-review

395 Scopus citations


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 languageEnglish
Pages (from-to)1438-1441
Number of pages4
Issue number11
StatePublished - 20 Nov 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018 Optical Society of America.


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