Magneto-optical reproducing head of a high light utilization rate

In a magneto-optical reproducing head for use in a magneto-optical reproducing device together with a laser beam source and a magneto-optical recording medium, said head including a first and a second beam splitter along a light path and first means for causing a forward laser beam to forwardly proceed along said light path from said laser beam source to said recording medium and for causing a reversed laser beam to reversedly proceed partly along said light path from said recording medium, said reversed laser beam comprising an information and an orthogonal component having polarization planes perpendicular and parallel to a polarization plane which said forward laser beam has at said recording medium, respectively, said first beam splitter having a first transmissivity for a first p-polarized component, substantially totally reflecting a first s-polarized component, and being oriented to make said forward laser beam pass therethrough as said first p-polarized component, said second beam splitter having a second transmissivity for a second p-polarized component, substantially totally reflecting a second s-polarized component, and being oriented to reflect said information component as said second s-polarized component and to make said orthogonal component reversedly pass therethrough as said second p-polarized component, said first transmissivity being substantially equal to unity, said head further including information detecting means responsive to the information component reflected in said second beam splitter for detecting information recorded on said recording medium and second means between said first and said second beam splitters for giving a 90.degree. difference between polarization planes of the forward laser beam incident thereon and of the orthogonal component having reversedly passed therethrough to make said forward laser beam forwardly pass through said second beam splitter as said second p-polarized component and to make said orthogonal component reversedly enter said first beam splitter as said first s-polarized component, the improvement wherein said second transmissivity is greater than 0.5 and said head comprising signal producing means responsive to the orthogonal component reflected in said first beam splitter for producing a control signal for use in servo controlling said magneto-optical reproducing device.