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Polarisation-independent ultrafast laser selective etching processing in fused silica

Abstract: In fused silica, ultrafast laser assisted etching enables high chemical etching rates (>300 [mi]m h-1) by setting a light polarisation linear and perpendicular to the beam writing direction. However, for many non-planar surfaces and 3D structures, dynamic polarisation control is difficult or not yet possible to implement. In this contribution, we identify a laser inscription regime in which high etching rates are accomplished independently of the light polarisation. In this regime (<15 pulses per ?m), we measure etching rates -300 [mi]m h-1 (4 hours in NaOH) including femtosecond-pulse energies corresponding to type II modifications. Few pulse inscriptions show a low degree of anisotropy as compared to higher number of pulses, thus enabling the polarisation insensitivity whose mechanisms are discussed. To demonstrate the capabilities of the processing, we fabricate curved and square-wave microchannels together with a complex 3D geometrical structure (stellated octahedron) containing an inter-plane arrangement with challenging angles (45°), which are difficult to achieve even employing dynamic polarisation control.

 Autoría: Ochoa M., Roldán-Varona P., Algorri J.F., López-Higuera J.M., Rodríguez-Cobo L.,

 Fuente: Lab on a Chip, 2023, 23(7), 1752-1757

 Editorial: Royal Society of Chemistry

 Fecha de publicación: 07/04/2023

 Nº de páginas: 6

 Tipo de publicación: Artículo de Revista

 DOI: 10.1039/d3lc00052d

 ISSN: 1473-0197,1473-0189

 Proyecto español: PID2019-107270RB-C21

 Url de la publicación: https://doi.org/10.1039/D3LC00052D