Figure 2: Representative phase-contrast images of microholes created in the infrared absorption films with different Nd:YAG laser powers and objective lens magnifications. (a) 159 mW, 20X. The film before (t=0.0 s) and after (t=0.2 s) the initiation of the laser irradiation, taken by the infrared video camera. The film during heat absorption as indicated by a bright intensity (t=0.4 s), in which a microhole is not yet created. The film after the creation of a microhole as indicated by a decrease in the light intensity at the center (t=0.6 s) where the infrared absorption film is melt ejected. (b–e) Linear microholes created at 194 mW, 20X (b), 159 mW, 20X (c), 116 mW, 20X (d), and 194 mW, 40X (e). (f) Quantification of the widths of the microholes, represented by mean ± SD (n=12). Scale bars, 100 μm (a–d); 20 μm (e).