| 摘要 |
PROBLEM TO BE SOLVED: To provide a high speed, inexpensive and small optical signal recording and reproducing apparatus. SOLUTION: The optical coupling device comprises prisms (PBP 1, PBP 2) and deformable mirror devices (DMD 4, DMD 3). The PBP 1 and the PBP 2 have the same shape, and a bottom surface 1d and an upper surface 2b, and a bottom surface 2d and an upper surface 1b are arranged on the same plane to each other, and a slant face 1c and a slant face 2c are arranged in parallel. The DMD 4 and the DMD 3 are provided at a bottom surface 1d side and a bottom surface 2d side, respectively. An angleθA formed by incident light L0 and a light beam L4, and an angleθB formed by a light beam L6 and emitted light L10 are 90 degrees, respectively, and the incident light L0 and emitted light L10 are on the same optical axis. The DMD 4 is driven simultaneously with the DMD 3 or so as to be behind, that is the DMD 4 is driven as that there is time to overlap reflected light from the DMD 3 and the DMD 4.
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