[1] Yokohama Natl Univ, Grad Sch Engn, Dept Phys, Yokohama, Kanagawa 2408501, Japan
[2] Tokyo Metropolitan Univ, Dept Phys, Hachioji, Tokyo 1920397, Japan
[3] LxRay Co Ltd, Nishinomiya, Hyogo 6638172, Japan
[4] Natl Def Acad, Dept Appl Phys, Yokosuka, Kanagawa 2398686, Japan