Phase and direction dependence of photorefraction in a low-frequency strong circular-polarized plane wave*
Huang Yong-Sheng†, Nai-Yan Wang, Tang Xiu-Zhang
       
The direction dependence of the refractive indices of a probe wave in a strong circular-polarized electromagnetic field. There are four modes for θ ≠ π /2. (a) Negative n 1; (b) ( n 2 + 1)/ ξ for θ ∈ [0, π /2) and ( n 2 − 1)/ ξ for θ ∈ ( π /2, π ]; (c) n 3; (d) ( n 4 − 1)/ ξ .