Large-capacity multi-dimensional optical storage read-write test system

Abstract

The invention discloses a large-capacity multi-dimensional optical storage test system, comprising: a femtosecond laser, a filter unit, a first reflector, a light intensity attenuator, a second reflector, a spatial light modulator, an optical switch, a 4f system, a polarization unit, Dichroic mirror, microscope objective lens, optical filter, focusing lens, multimode optical fiber, avalanche photodiode, first signal transmission line, data acquisition card, second signal transmission line, terminal, fourth signal transmission line. The invention transforms the traditional optical storage test system into a multi-dimensional optical storage system by obtaining the wavelength information output by the femtosecond laser, the phase information loaded on the light spot by the spatial light modulator, and the polarization information of the polarization unit that converts linearly polarized light into circularly polarized light. In the test system, more information can be stored in a single recording point on the storage medium, so that the storage capacity is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of photoelectric information storage, and in particular relates to a large-capacity multi-dimensional optical storage read-write test system. Background technique [0002] In recent decades, the development of optical storage technology has been carried out along how to reduce the laser wavelength and increase the numerical aperture of the lens. The blu-ray disc (BD) using short wavelength and high numerical aperture objective lens can be stored in a 15GB to 27GB of information is stored on a single-sided single-layer 12cm disc. However, due to the limitation of the diffraction limit of the optical system, and the current implementation cost and technical requirements for shorter wavelength lasers and larger numerical aperture lenses are too high, its storage density has also approached the limit of theoretical technology. In order to expand capacity and application fields, multi-dimensional optical storage...

AI Technical Summary

Problems solved by technology

However, most of the current optical storage test systems are for testing Blu-ray optical storage materials. The test wavelength is single. If other wavelengths are used, the laser needs to be replaced. The test system is complicated, and it is impossible to realize multi-wavelength, large-capacity and multi-dimensional optical storage material testing.

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