[1] Kozlovshy W J, Dewey A G,Juliana A,et al.Optical recording in the blue using a frequency-doubled diode laser.SPIE,1992,1663:410~415
[2] Mansfield S M,Studenmund W R,et al.High-numerical-aperture lens system for optical storage.Opt Lettt,1993,18(4):305~307