Kuo Paulina S
Opt Lett. 2022 Jan 1;47(1):54-57. doi: 10.1364/OL.444846.
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.
我们展示了一项关于薄膜周期性极化铌酸锂(PPLN)波导中非临界相位匹配行为的研究。非临界相位匹配是指设计波导,使得相位匹配对波导厚度、宽度或其他参数的变化不敏感。对于波导厚度(由于制造过程导致不均匀性最大的维度),我们发现相位匹配灵敏度可以最小化但不能消除。我们估计了可接受的厚度变化的限度,并讨论了薄膜PPLN变频器中二次谐波产生和和频产生时随器件长度的缩放情况。