Fig. 1. (a)–(i) OA and (a’)–(i’) CA normalized transmittances as functions of the position z of CS2 samples with thicknesses of (a)–(c), (a’)–(c’) 2 mm, (d)–(f), (d’)–(f’) 1 mm, and (g)–(i), (g’)–(i’) 0.5 mm under intensities of (a), (d), (g), (a’), (d’), (g’) 967GW/cm2, (b), (e), (h), (b’), (e)’, (h’) 764GW/cm2, and (c), (f), (i), (c’), (f’), (i’) 500GW/cm2. Green circles represent experimental data. Fitting results are given by BPDM (red lines) and SBM (blue dashed lines), respectively.

Fig. 2. Fitting curves of (a) OA and (a’) CA transmittances by two models for sample thickness of 1 mm and laser peak intensity of 967GW·cm−2 shown in Figs. 1(d) and 1(d’), with (b)–(d) intensity distributions and (b’)–(d’) phase distributions at the exit plane of the sample at z=−25, 0, 20 mm. Blue dashed lines and red lines are curves simulated using SBM and BPDM, respectively. The brown dotted lines in (b)–(d), (b’)–(d’) are plotted at the entrance plane of the sample.

Fig. 3. (a) NLA and (b) NLR coefficients versus I0·L obtained by fitting the z-scan data shown in Fig. 1 using SBM (hollow marks) and BPDM (solid marks) for samples of thicknesses 0.5 mm, 1 mm, and 2 mm (orange circle, brown triangle, and pink square marks). Blue–violet diamond marks are results obtained from the literature^{[8,1214" target="_self" style="display: inline;">–14,16]}. The 95% confidence interval bars are drawn with magnification factors of 1, 5, and 10 for results of the literature, SBM, and BPDM.