Roth, Gian-Luca; Rung, Stefan; Esen, Cemal & Hellmann, Ralf


“In this contribution, we report on the generation of internal microchannels with basically unlimited channel length inside of PMMA bulk material by femtosecond laser. A precisely controllable and stable circular channel cross section is obtained by using a spatial light modulator to compensate the writing depth depending spherical aberration. Furthermore, the generation of a rotatable elliptical input beam by adaptive optics ensures a fitting of the beam shaping to the writing direction. In this study, we report on both, the effect of the ellipticity of the input beam and the effect of a correction of the spherical aberration on the circularity of the resulting internal microchannels. Moreover, we demonstrate the application of this writing technique by creating microfluidic testing structures inside of a transparent standard polymer.”

Link to Publications Page

Publication: Optics Express
Issue/Year: Optics Express, Volume 28; Number 4; Pages 5801; 2020
DOI: 10.1364/oe.384948