Phase conjugate reconstruction of a hologram

A system for use with a storage medium that holographically stores information, the system comprising:

• a light source which generates a coherent light beam that is a reproduction of a reference beam used in storing information in the storage medium, wherein during the storing of the information, the reference beam passed through the storage medium at a particular location and angle and from a first side to a second side of the storage medium;
• a first mirror to direct the coherent light beam to pass through the storage medium from the first side to the second side to provide a directed coherent beam;
• and
• a second mirror to reflect the directed coherent beam to thereby provide a phase conjugate of the reference beam that passes through the storage medium from the second side to the first side at the same location and angle as the reference beam;
• and
• a waveplate configured to change a polarization of the directed coherent beam prior to the directed coherent beam passing through the storage medium from the second side to the first side.

A system for use with a storage medium that holographically stores information, the system comprising:

• means for generating a coherent light beam that is a reproduction of a reference beam used in holographically storing information in the storage medium, wherein during the storing of the information, the reference beam passed through the storage medium at a particular location and angle and from a first side to a second side of the storage medium;
• a first means for directing the coherent light beam to pass through the storage medium from the first side to the second side to provide a directed coherent beam;
• and
• a second means for reflecting the directed coherent beam, to thereby provide a phase conjugate of the reference beam that passes through the storage medium from the second side to the first side and at the same location and angle as the reference beam;
• and
• means for changing a polarization of the directed coherent beam prior to the directed coherent beam passing through the storage medium from the second side to the first side.

A system for use with a storage medium that holographically stores information, the system comprising:

• a light source which generates a coherent light beam that is a reproduction of a reference beam used in storing information in the storage medium, wherein during the storing of the information, the reference beam passed through the storage medium at a particular location and angle and from a first side to a second side of the storage medium;
• a first mirror to direct the coherent light beam to pass through the storage medium from the first side to the second side to provide a directed coherent beam;
• and
• a second mirror to reflect the directed coherent beam to thereby provide a phase conjugate of the reference beam that passes through the storage medium from the second side to the first side at the same location and angle as the reference beam, wherein the second mirror is an adjustable mirror that is capable of being adjusted so that the directed coherent beam is reflected to pass through the storage medium at the same angle and location as the reference beam.

A system for use with a storage medium that holographically stores information, the system comprising:

• means for generating a coherent light beam that is a reproduction of a reference beam used in holographically storing information in the storage medium, wherein during the storing of the information, the reference beam passed through the storage medium at a particular location and angle and from a first side to a second side of the storage medium;
• a first means for directing the coherent light beam to pass through the storage medium from the first side to the second side to provide a directed coherent beam;
• a second means for reflecting the directed coherent beam, to thereby provide a phase conjugate of the reference beam that passes through the storage medium from the second side to the first side and at the same location and angle as the reference beam;
• and
• means for adjusting an angle of the second reflecting means so that the directed coherent beam is reflected to pass through the storage medium from the first side to the second side at the same angle and location as the reference beam.