Additive-free multi-transparency glass 3D printing (Invited Paper)

Glass is essential in modern applications due to its exceptional properties, yet its additive manufacturing, especially for complex geometries, faces challenges in precise transparency control. We developed an additive-free, photoexcitation-induced multi-transparency glass 3D printing method using polymetric silsesquioxane (PSQ) and direct laser writing (DLW) with two-photon polymerization (TPP). By adjusting laser power, scanning speed, structure thickness, and heating rates during 3D printing, we controlled the transparency of the glass. Raman spectroscopy was used to analyze the polymerization degree and its impact on transparency. Our method allows for precise multi-transparency glass components, enhancing applications and reliability, and addressing stray light suppression in micro-optical systems, thus improving imaging system performance.