Figure | Concept and performance of liquid-like chalcogenide glass for high-power mid-infrared optics bonding. (IMAGE)
Caption
Figure | Concept and performance of liquid-like chalcogenide glass for high-power mid-infrared optics bonding. a, Optical and rheological properties of the liquid-like As-S(Se)-I glass. Transmission spectra and viscosity–temperature curves demonstrate excellent mid-infrared transparency (0.7-10 µm) and fluidic behavior with a steep viscosity decrease above 50 °C. Insets show the transparent glass sample and its remarkable flexibility at elevated temperature. b, Bonding process and mechanical reliability of the liquid-like glass adhesive. Schematic illustration of the bonding procedure where the preheated liquid glass is applied between optical substrates and solidifies upon cooling, forming a conformal high-index interface. The bonded assemblies exhibit strong shear and tensile strengths, confirming robust mechanical adhesion suitable for optical component integration. (c), High-power laser delivery through liquid-glass-bonded fiber endcaps. Illustration and experimental setup of fiber–lens bonding using the liquid-like glass, achieving improved delivery efficiencies of 70.5 % at 2.94 µm and 80.1 % at 4.7 µm, with a maximum output power of 11.7 W. Long-term cycling tests verify thermal and optical stability over more than 200 heating–cooling cycles.
Credit
Xunsi Wang et al.
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