Table 1. Retrieved equivalent Gaussian waist ( w _{0, Liu} ) and energy threshold value ( E _th,Liu ) after applying Liu’s method for the Airy disk represented in Figure 1.

The Liu’s method is applied considering 4 different cases with energies above the ablation threshold ( E _th ). The integration correction factor, η _ISD , and the ablation energy threshold correction factor, ${\eta }_{E_{th}}$ , are obtained after comparison of the Airy disk function and the retrieved Gaussians functions using the Liu’s method. η _F is the fluence correction factor.

Maximum energy considered	w 0, Liu (μm)	E th,Liu	η ISD	${\eta }_F=\frac{1}{{\eta }_{ISD}}$	${\eta }_{E_{th}}$
2·Eth	10.63	0.99	1.06	0.94	1.01
3·Eth	10.44	0.98	1.10	0.91	1.02
5·Eth	10.20	0.96	1.15	0.87	1.04
10·Eth	9.87	0.92	1.23	0.81	1.09