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Local Photo-Induced Crystallization by Laser Direct Writing on Infrared Ge Sb-Se Bulk Glasses

Authors: Kutálek Petr | Samsonova Ekaterina | Smolík Jan | Knotek Petr | Černošková Eva | Todorov Rosen | Tichý Ladislav

Year: 2025

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Local Photo-Induced Crystallization by Laser Direct Writing on Infrared Ge Sb-Se Bulk Glasses	Laser direct writing (LDW) is an advanced microfabrication technique for precise surface structuring of chalcogenide glasses. This study investigates the local photo-induced crystallization of Ge-Sb-Se bulk glasses under continuous-wave (CW) laser irradiation at wavelengths of 655 and 785 nm. The interaction of these visible lasers with annealed bulk glasses of varying mean coordination numbers (2.32–2.67) was explored to optimize the formation of microelements, including periodic structures. Structural and optical analyses, including Raman spectroscopy, X-ray diffraction (XRD), and ellipsometry, confirmed the presence of crystalline phases in the laser-exposed regions. The formation of GeSe₂ and Sb₂Se₃ crystalline domains was observed, with the extent of crystallization dependent on the glass composition and exposure conditions. In-situ photo-induced crystallization was investigated using chip differential scanning calorimetry (DSC). Beam intensity distribution analysis using a beam profiler revealed that the fabricated periodic structures (arrays) exhibit excellent usability as diffraction gratings. This study demonstrates that controlled LDW enables the fabrication of micro-optical elements with tunable properties, offering potential applications in beam shaping.	Ge-Sb-Se chalcogenide glasses; Laser direct writing; CW laser; Photo-induced crystallization