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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 14 — Jul. 2, 2012
  • pp: 15035–15044

Polarization behavior of femtosecond laser written optical waveguides in Ti:Sapphire

Jing Bai, Guanghua Cheng, Xuewen Long, Yishan Wang, Wei Zhao, Guofu Chen, Razvan Stoian, and Rongqing Hui  »View Author Affiliations

Optics Express, Vol. 20, Issue 14, pp. 15035-15044 (2012)

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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.

© 2012 OSA

OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(220.4000) Optical design and fabrication : Microstructure fabrication
(050.6624) Diffraction and gratings : Subwavelength structures
(130.5440) Integrated optics : Polarization-selective devices

ToC Category:
Laser Microfabrication

Original Manuscript: April 17, 2012
Revised Manuscript: May 25, 2012
Manuscript Accepted: June 4, 2012
Published: June 20, 2012

Jing Bai, Guanghua Cheng, Xuewen Long, Yishan Wang, Wei Zhao, Guofu Chen, Razvan Stoian, and Rongqing Hui, "Polarization behavior of femtosecond laser written optical waveguides in Ti:Sapphire," Opt. Express 20, 15035-15044 (2012)

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