“…The spatial intensity patterns visualised in this simulation are in agreement with previous experimental works. Intensity patterns for l = 0, m = 1 (LP 01 ); l = 1, m = 1 (LP 11 ); l = 1, m = 2 (LP 12 ); and l = 2, m = 1 (LP 21 ) in Figure 3 are similar with the experimental result reported in [16]. The intensity pattern for l = 3, m = 1 (LP 31 ) resembles the LP 31 mode pattern reported in [17].…”