title: Fluoroalkyl-grafted mesoporous silica antireflective films with enhanced stability in vacuum.
abstract: A new antireflective silica film with closed mesopores was successfully prepared for the optical elements used in vacuum of a high-power laser system. The ordered cagelike mesopores were formed with the direction of surfactant F127 and then closed by long-chain fluoroalkylsilane. The grazing incident x-ray diffraction and grazing incident small-angle x-ray scattering results indicated that the mesopores in film constructed a body-center cubic structure. The films exhibited excellent transmittance as high as 99.98% on quartz substrate. After a 1-month antipollution test with polydimethylsiloxane in vacuum, the decrease of transmittance was small as 0.02%. This film had a high laser-induced damage threshold of above 28 J/cm(2) at 1 ns laser pulse of 1053 nm wavelength.
authors.affiliation: Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China.
authors.forename: Jinghua
authors.initials: J
authors.lastname: Sun
authors.forename: Baohu
authors.initials: B
authors.lastname: Wu
authors.forename: Hongbao
authors.initials: H
authors.lastname: Jia
authors.forename: Dong
authors.initials: D
authors.lastname: Wu
authors.forename: Yao
authors.initials: Y
authors.lastname: Xu