A unique coaxial optical system which enables us to record and retrieve the holographic data on a continuously rotating disc is proposed. The system supports an image-stabilizing technique and several servo mechanisms.
We developed one dimensional data pattern hologram writer using GLV device as a spatial light modulator. The following advantages were expected: easier pixel matching, simpler signal processing, low height drive and high transfer rate. 171 angular multiplex recording holograms on a 1mm thickness polymer media, corresponding to 6.22 pixels/μm2 in density were demonstrated. With a Bit Error Rate (BER) of less than 2 x 10-4, 101 multiplexing holograms were successfully stored. Then, considerable error factors were discussed and solutions were given for higher multiplex recording.
We have developed an optical pick up with multi beam laser diode (LD). Multi beam LD has three emitters and individual emitter can control independently. Primary experiment for parallel recording has done and acceptable results for Power Margin, Tilt Margin, Defocus smargin and Detrack margin have measured. After than, possibility of double speed recording has confirmed by dual beam recording method.