Comparative study of dielectrics cutting with Bessel beam using refractive and reflective axicons

Dielectrics cutting with Bessel beams formed by an axicon is nowadays a well-known technique. Typically, the axicon is used in transmission to form the elongated Bessel beam. In this contribution, we report on dielectrics cutting with a femtosecond laser using a reflective axicon and compare the results in terms of surface roughness of the cutting planes with those obtained with a standard refractive axicon. Moreover, we couple the spatial beam shaping with temporal beam shaping applying MHz- and GHz-bursts of femtosecond pluses.