Void-nanograting transition by ultrashort laser pulse irradiation in silica glass Dai, Ye ; Patel, Aabid ; Song, Juan ; Beresna, Martynas ; Kazansky, Peter G. Abstract Publication: Optics Express Pub Date: August 2016 DOI: 10.1364/OE.24.019344 Bibcode: 2016OExpr..2419344D