title: Polarization behavior of femtosecond laser written optical waveguides in Ti:Sapphire.
abstract: Ultrashort pulsed laser photoinscription of Ti:Sapphire crystals may result in the self-organization of nanoscale material redistribution regions in regular patterns within the laser trace and stress-induced birefringence around the laser trace. We report on the formation of anisotropic optical waveguides in Ti:Sapphire by a procedure that involves femtosecond laser inscription of adjacent nonguiding birefringent traces with nanopatterned crosssections and the accumulation of stress birefringence in the region between. Double parallel line structures with a separation of 25μm with vertical and horizontal nanoscale arrangements were written with a choice of orthogonal polarizations. Due to anisotropic light scattering on periodic nanostructures and stress-induced birefringence in the central zone, remarkable polarization dependent guiding effects were observed as a function of the microscopic geometry of the structures. Building on this polarization sensitivity, several structure such as 3 × 3 waveguide arrays, diamond and hexagon patterns are also investigated.
authors: State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China.
authors: Jing
authors: J
authors: Bai
authors: Guanghua
authors: G
authors: Cheng
authors: Xuewen
authors: X
authors: Long
authors: Yishan
authors: Y
authors: Wang
authors: Wei
authors: W
authors: Zhao
authors: Guofu
authors: G
authors: Chen
authors: Razvan
authors: R
authors: Stoian
authors: Rongqing
authors: R
authors: Hui