Second, the 638 nm laser, when operated at 2.4 mW, resulted primarily in swelling (rather than ablation) of Material 3. The resulting raised lines on the polymer surface had average heights of 3.1 µm and average widths of 12.6 µm. In contrast, the presence of the g-Fe2O3 particles in Material 4 resulted in ablation across all powers tested. Third, the modifications resulting from the 638 nm and 786 nm lasers were generally less controllable than the modifications made with the 532 nm laser. This is due primarily to the higher power of the 638 nm and 786 nm lasers in the Horiba system. Notable exceptions included the controlled swelling of Material 3 using the 638 nm laser operating at 2.4 mW and the formation of relatively uniform channels on Materials 1, 2, and 4 for either the 638 nm or confirmed that common commercial polymers were not modified by any of the lasers when operating at 10% power or less at a speed of 18 µm/s (S47). These results illustrate how Materials 1-4 are unique in their photosensitivity to these low-power lasers. with the laser power. In general, the modifications resulting from exposure to the 532 nm laser were the most uniform, providing channels via ablation with widths and depths correlating with laser power. The 638 nm laser, operating at 2.4 mW, could be used to generated raised lines on Material 3, due to polymer swelling. Limited control was imparted in the modifications with the higher powers of the 786 nm laser.