Chen, Xin; Karpinski, Pawel; Shvedov, Vladlen; Boes, Andreas; Mitchell, Arnan; Krolikowski, Wieslaw; Sheng, Yan
We demonstrate an all-optical fabrication method of quasi-phase matching structures in lithium niobate (LiNbO₃) waveguides using a tightly focused femtosecond near-infrared laser beam (wavelength of 800 nm). In contrast to other all-optical schemes that utilize a periodic lowering of the nonlinear coefficient 𝜒⁽²⁾ by material modification, here the illumination of femtosecond pulses directly reverses the sign of 𝜒⁽²⁾ through the process of ferroelectric domain inversion. The resulting...[Show more]
Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.