Juodkazis, SauliusRode, Andrei VKondo, ToshiakiMisawa, HiroakiSamoc, MarekLuther-Davies, Barry2015-12-080272-9172http://hdl.handle.net/1885/36557The nonlinear absorption coefficient of As2S3 glass has been measured to be 2.0 cm/GW for femtosecond pulses at 800 nm. Femtosecond laser structuring via two photon absorption in bulk As2S3 glass by erasable and permanent photo-darkening is demonstrated using both holographic and direct multi-beam laser writing.Keywords: Absorption; Holography; Optical data storage; Photons; Multi beam laser writing; Nonlinear absorption coefficient; Permanent optical memory; Photo darkening; Ultrashort pulses20072015-12-08