飞秒激光与透明硬质材料的相互作用:从相变机理到永久光存储  

Interaction Between Ultrafast Laser and Transparent Hard Materials:from Phase Change Mechanism to Eternal Optical Data Storage

作　　者：刘姿廷 袁一鸣 李子越 龚伟 张栩 赵新景 王熠[3] 李臻赜 王磊[1] Liu Ziting;Yuan Yiming;Li Ziyue;Gong Wei;Zhang Xu;Zhao Xinjing;Wang Yi;Li Zhenze;Wang Lei(College of Electronic Science&Engineering,State Key Lab Integrated Optoelectronics,Jilin University,Changchun 130012,Jilin,China;College of Physics,Jilin University,Changchun 130012,Jilin,China;Department of Precision Instrument,State Key Lab Precision Measurement Technology&Instruments,Tsinghua University,Beijing 100084,China)

机构地区：[1]吉林大学电子科学与工程学院,集成光电子国家联合重点室,吉林长春130012 [2]吉林大学物理学院,吉林长春130012 [3]清华大学精密仪器系,精密测试技术与仪器国家重点实验室,北京100084

出　　处：《中国激光》2023年第18期59-73,共15页Chinese Journal of Lasers

基　　金：山东省重点研发项目(2021CXGC010201);国家自然科学基金(61825502,61827826,62175086);吉林大学学科交叉融合创新项目(JLUXKJC2021ZZ15);吉林省教育厅科学技术研究项目(JJKH20221003KJ);吉林省科技发展计划项目(20220101107JC)。

摘　　要：随着大数据时代的来临,利用飞秒激光在透明硬质材料中写入数据形成永久光存储的技术成为高容量、长寿命冷数据的一种理想存储方案,具有广阔的应用前景。本文从飞秒激光永久光存储发展存在的问题出发,梳理了近20年来超快激光与透明硬质材料相互作用的机制,总结了飞秒激光诱导相变的类型和过程,展示了其在光存储方面的应用;同时,从写入速度和容量角度出发,介绍了最新的脉宽调制效应和热调制高重复频率直写技术,阐述了五维永久光存储目前面临的挑战以及可行的解决办法。Significance Since the beginning of the 21st century,with the rise of the internet,artificial intelligence,cloud computing,and cloud storage,the amount of data generated has grown exponentially,thus leading to a sharp increase in the demand for data storage.According to the International Data Corporation(IDC),by 2025,the world is expected to produce a total of 175 ZB(1 ZB=1012 GB)of data,of which approximately 10%‒15%is expected to eventually evolve into cold data,which does not require frequent access but needs to be stored for a long time.Such data include the National Archives Center data,human civilization events,and scientific achievements.Cold data can be stored in several ways,including in mechanical hard drives,solid-state drives,and tape storage.Among these,magnetic storage has problems,such as vulnerability to damage and high environmental requirements.In comparison,optical storage technology is durable,lighter,more energy-efficient,and has lower environmental requirements.Optical disk storage uses lasers to modify and engrave 0 and 1 on the surface of photosensitive materials to achieve storage.However,further reducing the point size of optical storage is challenging owing to the diffraction limit;consequently,increasing the capacity of optical disks is challenging.A possible solution for increasing the storage capacity and reducing the refresh rate involves shifting from 2D storage to 3D storage,and from organic storage to inorganic optical storage.Femtosecond laser optical storage,which uses ultrafast lasers with extremely high peak powers to store data inside hard materials such as glass,sapphire,and diamond,has become a potential solution.Since 2003,several research institutions,including Kyoto University in Japan;the University of Southampton in the UK;and Tsinghua University,Huazhong University of Science and Technology,and Jilin University in China have introduced fivedimensional optical storage technology.Hitachi and Microsoft Research in Cambridge have also introduced unique ultrafast laser

关 键 词：激光技术 永久光存储 超快激光加工 光与物质相互作用 相变 

分 类 号：TN249[电子电信—物理电子学]