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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.
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Contributor : Razvan Stoian Connect in order to contact the contributor
Submitted on : Wednesday, June 20, 2012 - 8:14:57 PM
Last modification on : Saturday, June 25, 2022 - 10:53:43 AM


  • HAL Id : ujm-00710429, version 1



Jing Bai, Guanghua Cheng, Xuewen Long, Yishang Wang, Zhao Wei, et al.. Polarization behavior of femtosecond laser written optical waveguides in Ti:Sapphire. Optics Express, 2012, 20 (14), pp.15035. ⟨ujm-00710429⟩



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