Deep microdrilling by femtosecond laser pulses delivered through hollow core fiber

Abstract

Femtosecond laser drilling of high aspect ratio microholes using laser pulses delivered through hollow core fiber is presented. The purpose is to study the feasibility of the process and the quality of the microholes. The microdrilling is performed using a Ti:Sapphire laser with a center wavelength of 790 nm and a repetition rate of 1 kHz. The hollow core diameter of the fiber is 150 µm. The effects of various parameters (pulse energy, pulse duration, etc.) on laser beam and fiber coupling efficiency and hole quality are investigated. Microholes of 100-200 µm in diameter with various depths are drilled in stainless steel samples. The hole quality is examined using optical microscope.Femtosecond laser drilling of high aspect ratio microholes using laser pulses delivered through hollow core fiber is presented. The purpose is to study the feasibility of the process and the quality of the microholes. The microdrilling is performed using a Ti:Sapphire laser with a center wavelength of 790 nm and a repetition rate of 1 kHz. The hollow core diameter of the fiber is 150 µm. The effects of various parameters (pulse energy, pulse duration, etc.) on laser beam and fiber coupling efficiency and hole quality are investigated. Microholes of 100-200 µm in diameter with various depths are drilled in stainless steel samples. The hole quality is examined using optical microscope.