Voigtländer, C.C.VoigtländerRichter, D.D.RichterThomas, J.J.ThomasTünnermann, A.A.TünnermannNolte, S.S.Nolte2022-03-042022-03-042011https://publica.fraunhofer.de/handle/publica/22429510.1007/s00339-010-6065-6We present volume Bragg gratings (VBGs) with a period of 1.075 µm inscribed in fused silica using a femtosecond laser and a phasemask. The femtosecond-inscribed VBGs can be used as reflecting elements with reflectivities of about 80% for a 1-mm-long grating. Due to the nonsinusoidal refractive-index shape, higher order Bragg resonances up to the 7th reflection order could be measured. Therefore, the Bragg gratings also reflect light in the visiblewavelength range.en620621journal article