Interference patterns Comb filters 1 Copper 1 Copper foils 1 Cutting 1 Cutting process 1 Direct laser interference patterning 1 Dual wavelength fiber lasers 1 Dual wavelength laser 1 Electric batteries 1 Erbium 1 Erbium doped fibers 1 Fiber lasers 1 Fibers 1 Free spectral range 1 Gaussian beams 1 Interferometers 1 Laser beam cutting 1 Laser beams 1 Laser materials processing 1 Laser sources 1 Low power laser 1 Mach-Zehnder interferometer 1 Mach-Zehnder interferometers 1 Metal cutting 1 Performance 1 Proof of concept 1 Pure copper 1 Side mode suppression ratios 1 Single-beam 1