Figure 3.

(a) Microscope photograph, (b) laser ablation shape, (c) schematic diagram of overlapping effect and (d) schematic diagram of channel ablated by overlapped pattern. The conditions of lasers: fluence of 6 J cm⁻², beam size of 150 μm, beam firing frequency at 10 Hz, ablation progression speed at 100 μm s⁻¹, and ablated once.