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 sketch map for the phase and direction dependence of vacuum polarization of a probe wave in a strong rotating electromagnetic field with the scaling length , where λ com,e ≈ 2.4263 × 10−12 m is the Compton wavelength of an electron.