Direct laser write of volume Bragg gratings with diffraction efficiency (absolute) ∼90% is demonstrated using Gauss-Bessel laser beams in fused silica glass. Axial multiplexing of ∼ 90 μm long segments of modified optical material was demonstrated and thick Bragg gratings of aspect ratio depth/period ≈234 were achieved with period d = 1.5 μm. Typical fabrication scanning speeds were up to 50 mm/s for gratings with cross sections up to five millimeters made within 1 h time. Potential applications of high efficiency Bragg gratings in a low nonlinearity medium such as silica are discussed.
High 90% efficiency Bragg gratings formed in fused silica by femtosecond Gauss-Bessel laser beams
M. Mikutis,T. Kudrius,G. Šlekys,D. Paipulas,S. Juodkazis
Published 2013 in Optical Materials Express
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- Publication year
2013
- Venue
Optical Materials Express
- Publication date
2013-11-01
- Fields of study
Materials Science, Physics, Engineering
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