Optware, in collaboration with other companies, developed a prototype of an optical component for holographic players featuring lower production costs and smaller sizes. The technique used by Optware is called "collinear" because recording and reference lights are provided on the same optical axis. As explained in a news published at Tech-On:
By modulating a laser beam with a spatial phase modulator, the technology utilizes the center and peripheral portions of the beam as the recording light having embedded data and the reference light, respectively. These lights are interfered with each other to record interference fringes that include information onto a recording medium. At the time of playback, the recording light can be reproduced by irradiating the medium with only the reference light.
Some technical details are available in the original article.
