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Micrograph of the poled NPQC. The arrow indicates the fundamental beam propagation direction.
(a) The diffraction pattern of NPQC. (b) An expanded view on the diffraction pattern within a sector.
Schematic representation of the collinear SHGs observed in the octagonal NPQC.
The QPM schemes in reciprocal vector space. The momentum conservation between and is achieved using standard QPM and those for and are projection-based. The real lines represent the wave vectors and RVs, and the dashed lines denote projections of RVs.
Collinear SHGs in the NPQC. The wavelength is in unit of and RV is in unit of . Sellmeier coefficients at were used to calculate .15
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