Mikutis M.,Altechna RD |
Mikutis M.,Vilnius University |
Kudrius T.,Altechna RD |
Kudrius T.,Vilnius University |
And 4 more authors.
Optical Materials Express | Year: 2013
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. © 2013 Optical Society of America.