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CW laser-induced surface elements on Ge-Sb-Se chalcogenide glasses

Authors: Samsonova Ekaterina | Kutálek Petr | Černošková Eva | Smolík Jan | Knotek Petr | Schwarz Jiří

Year: 2024

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	CW laser-induced surface elements on Ge-Sb-Se chalcogenide glasses	Light interacts with optical materials through reflection, absorption, or transmission, depending on wavelength and material nature. For short wavelengths (high frequencies), this range is limited by the fundamental electron absorption. while for long wavelengths (low frequencies), it is limited by multi-phonon absorption. To further extend the transmission window towards long wavelengths, optical materials with particularly low phonon energies are required. Typically, these are materials with relatively heavy atoms, because their chemical bonds vibrate with low frequency. Chalcogenides are a promising platform for signal processing when combined with fiber and waveguide devices, achieving terahertz bandwidths [1]. Ge-Sb-Se glasses were synthesized using the melt-quenching technique. Our attention is directed towards the photoinduced volume changes on the surfaces of (GeSe2)100–x(Sb2Se3)x bulk glasses (where x = 0, 7, 17, 30, 40, 50 and 60). These glasses were chosen due to their unique properties (transparency approximately up to 18 μm in the IR range, low phonon energy and high refractive index) and also because of the above mentioned reasons. The illumination and photo-induced volume changes were performed using the laser direct writing technique [2], employing continuous-wave (CW) lasers operating at λ = 655 and 785 nm (the maximum laser power density up to 8000 W/ cm2 ). The illumination led to the glass expansion and microelements formation. We examined the influence of various factors, including chemical composition and exposure conditions, on the formation of microelements. For our analysis, we employed several characterization techniques, such as Raman and Force spectroscopies, Energy-Dispersive X-ray Spectroscopy, and Digital Holographic Microscopy	laser direct writing, microelements/microstructures, Ge-Sb-Se chalcogenide glasses, CW laser