Patent ID: 8036072

Claim:
A holographic recording and reproduction system having servo optical path, comprising: a holographic recording medium; a light source, used to generate a light; a first light guidance portion, placed in front of said light source, such that said light generated by said light source is divided into a signal beam and a reference beam after passing through said first light guidance portion, wherein the first light guidance portion includes an object lens, said objected lens is used to converge said reference beam into a condensed light beam and said condensed light is incident upon said holographic recording medium along a first direction; a spatial light modulator, located on the optical path of said signal beam, thus said signal beam is incident upon said holographic recording medium along a second direction, after it enters and exits said spatial light modulator, hereby interfering with said reference beam in producing a holographic interference fringe in said holographic recording medium; a second light guidance portion, used to make said signal beam be incident upon said holographic recording medium along said second direction, after guiding said signal beam into said spatial light modulator, wherein said second light guidance includes more than one lens and more than one set of reflector mirrors, said more than one set of reflector mirrors are used to make said signal beam change its transmission direction after being incident on and exiting said spatial light modulator, one of said more than one lens is used to converge said signal beam into a concentrated light beam and said concentrated light is incident upon said holographic recording medium along said second direction; wherein, when said reference beam is incident upon said holographic interference fringe again along said first direction, a reproduction beam is produced, and said reproduction beam is incident upon an image sensor along said optical path of said signal beam in an opposite direction; a servo light source, used to generate a servo beam; and a servo beam guidance portion, wherein said servo beam is incident upon a servo track of said holographic recording medium via said servo beam guidance portion in said first direction, and reflects said servo beam from said servo track, thus enabling said holographic interference fringe to be recorded in said holographic recording medium continuously along said servo track, the beam formed by said servo beam includes said reference beam.