Femtosecond laser ablation at oblique angle of incidence and its application to fluence profiling in femtosecond laser filaments in air

摘要

Studies of femtosecond laser ablation are motivated both by its applications in micromachining and by the need to understand optical damage by intense femtosecond laser pulses. Virtually all of the prior studies have been conducted for the cases in which the ablating laser pulse strikes the surface of the material at normal angle of incidence (AOI). However, in practice, many if not most optical elements are used at oblique AOIs (most commonly at 45