Holographic storage device and method for simultaneously recording and reading on two sides

A holographic storage device for simultaneously recording and reading on two sides, comprising a plurality of optical heads disposed on both sides of a storage medium, which are capable of performing information recording and reading simultaneously or separately, the plurality of optical heads includes, a first optical head and a second optical head, which are symmetrically disposed on two sides of the storage medium respectively;

• the first optical head and the second optical head are capable of performing information recording and reading simultaneously or separately;
• and information recorded by the first optical head is read by a reading device in the second optical head, and information recorded by the second optical head is read by a reading device in the first optical head, each reading device has a photoelectric detector configured to detect an obtained reproduction signal beam.

A holographic storage method for simultaneously recording and reading on two sides, wherein a first optical head and a second optical head symmetrically disposed on two sides of a storage medium perform information recording and reading simultaneously or separately, comprising:

• reading information recorded by the first optical head by a reading device in the second optical head, and reading information recorded by the second optical head by a reading device in the first optical head.