Ultra-thin glass(UTG)possesses a broad spectrum of applications in high-end electronic devices,such as foldable smartphones and flexible displays.Laser beam shaping for arc cutting UTG screens helps reduce stress conc...Ultra-thin glass(UTG)possesses a broad spectrum of applications in high-end electronic devices,such as foldable smartphones and flexible displays.Laser beam shaping for arc cutting UTG screens helps reduce stress concentration,thereby effectively enhancing their safety and longevity.However,the existing three-dimensional(3D)holography algorithms in beam shaping often suffer from high computational complexity and limited flexibility.To address these issues,we propose an iterative holographic algorithm combined with 3D chirp-z transform(3D-CZT)that generates 3D designable multi-foci with 90%light field uniformity.It also effectively corrects spherical aberration caused by refractive index mismatches,while maintaining precise beam shaping throughout the material.Moreover,by focusing on a specific region,the 3D-CZT method reduces the single iteration time to 0.5 seconds,achieving a speed one order of magnitude faster than conventional algorithms.On this basis,customizable glass-edge cutting by shaping the 3D-focused beam within the material is achieved.The glass edge demonstrates high geometric fidelity and remains smooth,mitigating the risk of micro-cracks.This work proposes a sophisticated and efficient methodology for the laser cutting of transparent materials.展开更多
文摘为了探究玻璃成型预加热段中部凹陷的形成机理及玻璃厚度、长宽比两种形状参数对其影响,基于生产线预加热炉的工艺流程,建立了流体-热场-固体多物理场耦合数值模型.同时,利用高温红外热成像技术获取预加热段结束时玻璃表面的温度场分布情况,以验证炉腔内流体-热场耦合数值模型的准确性.然后基于流体-热场-固体多物理场模型对预加热段玻璃中部凹陷形成过程进行仿真,探究玻璃中部凹陷形成的机理.最后探讨了两种形状参数对玻璃凹陷变形的影响程度.研究表明:玻璃的形状参数对玻璃的形变有重要影响,即随玻璃厚度减小,弯曲刚度也不断减小,玻璃中部凹陷越严重;玻璃的长宽比对玻璃变形也有重要影响,当玻璃长宽比从6.32减小到1.58时,玻璃的横向热应变区会增大,玻璃的凹陷深度从4.65 mm增加到9.34 mm.
基金supported by the National Key Research and Development Program of China(Nos.2021YFF0502700、2024YFB4610700)the National Natural Science Foundation of China(Nos.62325507、62375253、52375582、62475252)+3 种基金Major Scientific and Technological Projects in Anhui Province(202203a05020014)the CAS Project for Young Scientists in Basic Research(No.YSBR-049)Joint Research and Development Projects(2024CSJGG0500)the Fundamental Research Funds for the Central Universities(WK2090050048)。
文摘Ultra-thin glass(UTG)possesses a broad spectrum of applications in high-end electronic devices,such as foldable smartphones and flexible displays.Laser beam shaping for arc cutting UTG screens helps reduce stress concentration,thereby effectively enhancing their safety and longevity.However,the existing three-dimensional(3D)holography algorithms in beam shaping often suffer from high computational complexity and limited flexibility.To address these issues,we propose an iterative holographic algorithm combined with 3D chirp-z transform(3D-CZT)that generates 3D designable multi-foci with 90%light field uniformity.It also effectively corrects spherical aberration caused by refractive index mismatches,while maintaining precise beam shaping throughout the material.Moreover,by focusing on a specific region,the 3D-CZT method reduces the single iteration time to 0.5 seconds,achieving a speed one order of magnitude faster than conventional algorithms.On this basis,customizable glass-edge cutting by shaping the 3D-focused beam within the material is achieved.The glass edge demonstrates high geometric fidelity and remains smooth,mitigating the risk of micro-cracks.This work proposes a sophisticated and efficient methodology for the laser cutting of transparent materials.
