High-Order Spectral Finite Elements in Analysis of Collinear Wave Mixing

Table 1

The comparison between SFEs and FEM for plane wave case.

	3 × 3 nodes’ SFE	8 × 6 nodes’ SFE	FEM
DOFs	505,202	178,602	1,608,402
Error	1.85%	0.15%	2.27%
CPU time	3 h 15 min	4 h 30 min	10 h