Noncritical phasematching behavior in thin-film lithium niobate frequency converters

We present a study of noncritical phasematching behavior in thin-film, periodically poled lithium niobate (PPLN) waveguides. Noncritical phasematching refers to designing waveguides so that the phasematching is insensitive to variations in waveguide thickness, width, or other parameters. For wavegui...

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Bibliographic Details
Published in:Optics letters 2022-01, Vol.47 (1), p.54-57
Main Author: Kuo, Paulina S
Format: Article
Language:English
Subjects:
Frequency converters
Lithium niobates
Nonuniformity
Phase matching
Second harmonic generation
Thickness
Waveguides
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Summary:We present a study of noncritical phasematching behavior in thin-film, periodically poled lithium niobate (PPLN) waveguides. Noncritical phasematching refers to designing waveguides so that the phasematching is insensitive to variations in waveguide thickness, width, or other parameters. For waveguide thickness (the dimension with greatest nonuniformity due to fabrication), we found that phasematching sensitivity can be minimized but not eliminated. We estimate limits on the acceptable thickness variation and discuss scaling with device length for second-harmonic generation and sum-frequency generation in thin-film PPLN frequency converters.
ISSN:0146-9592
1539-4794
1539-4794
DOI:10.1364/OL.444846