Femtosecond laser induced microstructures with photonic functions

Femtosecond laser is a perfect laser source for materials processing when high accuracy and small structure size are required. Due to the ultra short interaction time and the high peak power, the process is generally characterized by the absence of heat diffusion and, consequently molten layers. Various induced structures have been observed near the focal point of the laser beam in materials after the femtosecond laser irradiation. Here, we report on fabrication of micro-optical devices by using femtosecond laser induced structures.