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Inscription of high contrast volume Bragg gratings in fused silica with femtosecond laser pulses

: Voigtländer, C.; Richter, D.; Thomas, J.; Tünnermann, A.; Nolte, S.


Applied physics. A 102 (2011), No.1, pp.35-38
ISSN: 0340-3793
ISSN: 0721-7250
ISSN: 0947-8396 (Print)
ISSN: 1432-0630 (Online)
Journal Article
Fraunhofer IOF ()

We 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.