基于飞秒激光诱导双折射效应的时间胶囊的制备(特邀)

利用双折射显微镜和光学显微镜研究了飞秒激光石英材料内部诱导的双折射效应。结果表明,双折射的光学延迟量随脉冲数的增加而增加,并出现两种双折射结构。其中Type X结构需要至少20个脉冲,单脉冲能量不高于854 nJ,脉冲宽度不低于300 fs且不高于600 fs。此外,以"光子学报"等汉字为例,阐述了激光诱导双折射的数据存储过程,制备了包涵吉林省省史省情、吉林大学校史、清华大学校史的数据存储时间胶囊样品。

Spatial light modulation for femtosecond laser manufacturing:Current developments and challenges

Since the invention of lasers,spatial-light-modulated laser processing has become a powerful tool for various applications.It enables multidimensional and dynamic modulation of the laser beam,which significantly improves the processing efficiency,accuracy,and flexibility,and presents wider prospects over traditional mechanical technologies for machining three-dimensional,hard,brittle,or transparent materials.In this review,we introduce:(1)The role of spatial light modulation technology in the development of femtosecond laser manufacturing;(2)the structured light generated by spatial light modulation and its generation methods;and(3)representative applications of spatial-light-modulated femtosecond laser manufacturing,including aberration correction,parallel processing,focal field engineering,and polarization control.Finally,we summarize the present challenges in the field and possible future research.

飞秒激光永久光存储的发展及挑战

面向大数据存储,总结当前冷数据存储的主要方式及特点,针对长寿命和高容量的需求,介绍飞秒激光永久光存储的概念和基本存储内涵;围绕透明介质材料体内改性的类型,依次介绍三维光存储和五维光存储的历史发展过程;阐述了当前具有双折射特性的存储单元形成机制,超百层的高密度存储技术,225 kB/s单通道、潜在MB/s多通道的快速直写机制;并从纳米区域的电场连续性边界条件和光学衍射极限出发,展望飞秒激光永久光存储在存储容量和写入速度方面的挑战。