Application of Piezo Technology in Holographic Storage
Application of Piezo Technology in Holographic Storage With the development of society and the progress of technology, people's demand for information keeps increasing. Due to the multi-media of information, people's data processing is no longer simple text, sound, image, but digital multimedia information integrated by high definition and high quality sound and motion image. The requirement of information data storage is higher and higher, especially the requirement of storage size and rate, which promotes the development of various storage technologies. Existing memory technologies, such as magnetic storage and semiconductor storage, are still improving to meet the demands of large capacity and high access rates, but these storage methods are gradually approaching their physical limits. Holographic storage will be a more ideal storage technology. Holographic optical storage technology is a kind of information storage technology with great development potential, which has attracted more and more attention because of its advantages such as high information redundancy, high storage capacity and high access rate.
Holographic Storage Technology Holographic storage is an ultra-high density storage technology that uses light interference to record information in the form of holography on the recording material and recover the stored information in the form of diffraction under specific conditions. The principle of holographic recording is the same as that of holography, but the specific method is different. One is that, the data is stored not on film but in a material that reflects light. A piece of medium like the size of a small sugar cube contains thousands of pages, each containing millions of bits of information. Second, the way of using object light is different. During the write operation of holographic storage, the output of a laser beam is divided into two beams, one of which is expanded and then projected on the recording medium as a reference light. After the other laser beam is expanded, it is reflected by the surface of the recorded object, and as the object light, it is also projected onto the recording medium. The object light is used to carry the data, which is expanded to be able to fully illuminate the entire stereo light modulator (SLM). The SLM is similar to an LCD panel, which displays the binary data to be stored in an array of light and dark pixels in a full-page fashion. After the object light passes through the SLM, some light up and some dim, which is to carry the data of the page. Then, the same reference light acts in the medium, turning the whole page of data into an interference fringe pattern, and the whole page of data is stored in the medium through the interference pattern.