High-performance laser processing using manipulated ultrafast laser pulses

Abstract

Articles you may be interested inMechanism of heat-modification inside a glass after irradiation with high-repetition rate femtosecond laser pulses Interaction between laser beam, process effects, and structural properties during welding using models based on the finite element analysis Aluminum alloy welding by using a high power direct diode laser Pulsed laser welding of metal-polymer sandwich materials using pulse shaping Abstract. We employ manipulated ultrafast laser pulses to realize microprocessing with highperformance. Efficient microwelding of glass substrates by irradiation by a double-pulse train of ultrafast laser pulses is demonstrated. The bonding strength of two photostructurable glass substrates welded by double-pulse irradiation was evaluated to be 22.9 MPa, which is approximately 22% greater than that of a sample prepared by conventional irradiation by a single pulse train. Additionally, the fabrication of hollow microfluidic channels with a circular crosssectional shape embedded in fused silica is realized by spatiotemporally focusing the ultrafast laser beam. We show both theoretically and experimentally that the spatiotemporal focusing of ultrafast laser beam allows for the creation of a three-dimensionally symmetric spherical peak intensity distribution at the focal spot.