Product Code: ICA10_M505

Picosecond Laser 4-Beams Interference Ablation of Metal Films for Microstructuring
Authors:
B. Voisiat, Laboratory for Applied Research, Center for Physical Science and Technology; Vilnius Lithuania
M. Gedvilas, Laboratory for Applied Research, Center for Physical Science and Technology; Vilnius Lithuania
G. Raciukaitis, Laboratory for Applied Research, Center for Physical Science and Technology; Vilnius Lithuania
Presented at ICALEO 2010

Interfering of laser beams with the high pulse energy gives an opportunity to direct structuring over large areas. We report results of the laser beam interference ablation (LBIA) of thin metal film on the glass substrate irradiated by infrared picosecond laser. Laser beam was split in four beams at angle of 10 o by using the diffractive optical element. The 4-F imaging system was used to produce interference pattern on the surface of the metal film. Regular structures with a period of 2 µm were produced in thin films of various metals which can be used for filtering infrared or teraherz radiation. The structure was extended by translation the workpiece between laser pulses. Interference of multiple laser beams is capable in formation of variety of interference patterns, while selection of laser wavelength as well as imaging optics open possibility to control period of the structures down to sub-micrometer range.