Low-loss single-mode integrated waveguides in soda-lime glass
  Low-loss single-mode optical waveguide fabrication process in extra-white soda-lime glass is demonstrated. Waveguiding structures are formed in bulk substrates employing femtosecond laser writing technology. The combination of a slit beam-shaping method and a multiscan fabrication process enables printing of waveguides with a well-defined symmetric cross-section profile. Fabricated waveguides exhibit 0.86 dB/cm propagation loss for 800~nm wavelength. Bending loss in the waveguides are addressed experimentally and compared with a model for radiation loss. 
Ivan Dyakonov, Alexander Kalinkin, Mikhail Saygin, Andrey Abroskin,   Igor Radchenko, Stanislav Straupe and Sergei Kulik
physics.optics