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 techno...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.展开更多
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)。
文摘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.