The optical information reproducing method, an optical head device and an optical information processing apparatus

The optical information reproducing method of the present invention includes a recording layer on which information is recorded, is disposed close to the recording layer, and a mask layer including a nonlinear optical material whose optical characteristics are changed according to the intensity of the incident light and a reproduction method used for the optical information recording medium. The optical information reproducing method of the present invention, the convergent light polarized in a first direction to the optical recording medium is irradiated, the light reflected from the optical recording medium, a first polarization component polarized in a first direction, It is separated into a second polarized light component polarized in a second direction perpendicular to the first direction. Thus the separated second polarization component to detect a reproduction signal.