High 90% efficiency Bragg gratings formed in fused silica by femtosecond Gauss-Bessel laser beams

Mindaugas Mikutis, Tadas Kudrius, Gintas Šlekys, Domas Paipulas, Saulius Juodkazis
2013 Optical Materials Express  
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
more » ... tential applications of high efficiency Bragg gratings in a low nonlinearity medium such as silica are discussed.
doi:10.1364/ome.3.001862 fatcat:wgptpvkd25c4nblajmlckrkbvm