Optical information recording and reproducing apparatus

An optical information recording and reproducing apparatus comprising at least a substrate, a reflection layer formed on the recording surface of the substrate, an optical information recording layer, a super resolution layer having the complex refractive index reversibly changing with the temperature change, an optical information recording medium having a protection layer, a laser emission control unit for emitting the laser light to record or reproduce the optical information in the optical information recording medium and capable of changing the emission pattern of the laser light, a pickup for radiating by focusing the laser light on the surface of the optical information recording medium and receiving the light reflected from the optical information recording medium, a spindle and a spindle motor for supporting and rotationally driving the optical information recording medium, and a reproduction signal processing unit for arithmetically processing the received signal,

• wherein the laser light is emitted in pulses by the laser emission control unit, and the reproduction signal processing unit produces a reproduction signal from the result of the arithmetic process using the reproduction signals from the pulse emitting portion and the bias emitting portion of the pulse light.