摘要
Fast response,high luminescence contrast,three-dimensional(3D)storage,and nondestructive reading are key factors for the optical storage application of photochromic materials.Femtosecond(fs)laser direct writing technology with multiphoton nonlinear absorption is becoming a useful tool for microprocessing functional units in the 3D space of glass owing to its remarkable advantages,such as a fast processing speed and high processing accuracy.Herein,the photochromism of transparent glass codoped with rare-earth ions was investigated under 800-nm fs laser irradiation,affording a fast response.The photochromic glass achieves an upconversion luminescence(UCL)modification of 92%.The photochromic glass can be bleached back to its original color using heat treatment.The transmittance and UCL modification show excellent reproducibility under alternating stimulations between 800-nm fs laser irradiation and heat treatment.The data can be written in the interior of the transparent photochromic glass using 800-nm fs laser irradiation,facilitating 3D information storage.These results suggest that the 800-nm fs laser irradiation-subjected photochromic glass is an ideal optical data storage medium.
快速响应、高发光对比度、三维存储和信息无损读取是光致变色材料光存储应用的几个关键因素.具有多光子非线性吸收的飞秒激光直写技术以其加工速度快、加工精度高等独特优势,正成为玻璃三维空间微加工功能单元的有效工具.本工作研究了800 nm飞秒激光照射下稀土离子掺杂透明玻璃的光致变色性质,结果证实在800 nm飞秒激光辐照下玻璃展现了快速光致变色响应.在光致变色玻璃中实现了92%的上转换发光调控.光致变色玻璃可通过热刺激漂白回原色,在800 nm飞秒激光辐照和热处理交替刺激下,光致变色玻璃的透射率和上转换调控表现出良好的重现性.通过800 nm飞秒激光照射,可将数据信息写入透明玻璃内部,实现三维信息存储.结果表明,800 nm飞秒激光辐照诱导的光致变色玻璃是理想的光学数据存储介质.
基金
supported by the National Natural Science Foundation of China(51762029)
the Applied Basic Research Key Program of Yunnan Province(2018FA026)
the Key Project of the National Natural Science Foundation of China-Yunnan Joint Fund(U2102215)。
