Every reference with a DOI in the deposited reference list resolved to a known
work in Crossref or DataCite at the dated check, and none carried a retraction,
withdrawal, or removal notice.
The 29 checked references that resolve
resolves10.1109/JLT.2006.874605All-optical signal processing using /spl chi//sup (2)/ nonlinearities in guided-wave devices
resolves10.1364/OPTICA.3.001126Second-harmonic generation in aluminum nitride microrings with 2500%/W conversion efficiency
resolves10.1002/lpor.201800149Heterogeneously Integrated GaAs Waveguides on Insulator for Efficient Frequency Conversion
resolves10.1049/el:19890127Second-harmonic generation of green light in periodically poled planar lithium niobate waveguide
resolves10.1364/OL.24.00159031%-efficient blue second-harmonic generation in a periodically poled MgO:LiNbO_3 waveguide by frequency doubling of an AlGaAs laser diode
resolves10.1364/OL.27.000179Highly efficient second-harmonic generation in buried waveguides formed by annealed and reverse proton exchange in periodically poled lithium niobate
resolves10.1364/OL.29.001518Periodically poled lithium niobate waveguide sum-frequency generator for efficient single-photon detection at communication wavelengths
resolves10.1364/OL.40.002715Fabrication of nanoscale lithium niobate waveguides for second-harmonic generation
resolves10.1364/OE.24.029941Second-harmonic generation in periodically-poled thin film lithium niobate wafer-bonded on silicon
resolves10.1364/OE.25.006963Second harmonic generation in nano-structured thin-film lithium niobate waveguides
resolves10.1364/OL.42.000939Broadband sum-frequency generation using d_33 in periodically poled LiNbO_3 thin film in the telecommunications band
resolves10.1364/OPTICA.5.001006Highly tunable efficient second-harmonic generation in a lithium niobate nanophotonic waveguide
resolves10.1007/s11433-015-5728-xSecond harmonic generation in a high-Q lithium niobate microresonator fabricated by femtosecond laser micromachining
resolves10.1364/OPTICA.5.000872Quasi-phase-matched nonlinear optical frequency conversion in on-chip whispering galleries
resolves10.1364/OL.43.004116Lithium niobate micro-disk resonators of quality factors above 10<sup>7</sup>
resolves10.1038/s41467-017-02189-6Metasurface-assisted phase-matching-free second harmonic generation in lithium niobate waveguides
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