Dependence of the polarization of multiple dark waveguides in nonlinear liquids

We present the polarization dependence in the formation of dark spatial waveguides in nonlinear liquids like CS 2 . Our experimental and numerical results about the formation of dark waveguides show the dependence between the polarization and the formation of multiple waveguides. With a polarization angle between 100° - 120° for the incident beam we show that the wide of the waveguide is minimum and even dark spatial waveguides are formed. A discussion about waveguides formation is presented for others polarization angles. In this work we show an improvement in the method to measure low birefringence in optical fibers.