Effect of wavelength on HAZ and processing efficiency in CFRP ablated by femtosecond laser at different wavelengths

Abstract

As a new lightweight material, Carbon Fiber-reinforced polymer (CFRP) has been widely used in various fields, but its difficult-to-machine characteristic also severely restricts its application. In this paper, femtosecond laser with center wavelength of 400nm and 800nm was used for multi-pass scanning processing of CFRP to study the relationship between laser wavelength and processing quality and processing efficiency, and try to obtain smaller heat affected zone (HAZ). The experimental results show that when the experimental conditions are the same, the HAZ obtained by femtosecond laser processing of CFRP with the wavelength of 400 nm is about half that of the wavelength of 800 nm, and the minimum can reach 1.5μm, but the width of slit is smaller than that obtained by femtosecond laser processing with the wavelength of 800 nm. Therefore, reducing the wavelength of femtosecond laser can effectively reduce the HAZ, but at the same time, it will also reduce the processing efficiency.