Absorption characteristics of the composite reinforced by polyaryl amide fibers irradiated by high power laser

The absorption characteristics of the composite reinforced by polyaryl amide fibers irradiated by laser beam with a wavelength of 1.06μm were investigated using two integrated spheres and photodiode system. The intensity of laser beam, surface and volumetric reflectivity, volumetric absorption coefficient, transmissivity were obtained from the experiments. Experiments results show that volumetric reflectivity increases with both material thickness and laser intensity, volumetric absorption coefficient increases with material thickness, but decreases with laser intensity. A reasonable explanation is suggested based on the results and the material properties.