Inscription of high contrast volume Bragg gratings in fused silica with femtosecond laser pulses |
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| Authors: | Christian Voigtländer Daniel Richter Jens Thomas Andreas Tünnermann Stefan Nolte |
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| Affiliation: | 1.Institute of Applied Physics,Friedrich-Schiller-University Jena,Jena,Germany;2.Fraunhofer Institute for Applied Optics and Precision Engineering,Jena,Germany |
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| Abstract: | We present volume Bragg gratings (VBGs) with a period of 1.075 μm inscribed in fused silica using a femtosecond laser and a phase mask. The femtosecond-inscribed VBGs can be used as reflecting elements with reflectivities of about 80% for a 1-mm-long grating. Due to the non-sinusoidal 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 visible-wavelength range. |
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