摘要:
The present invention relates to a method for compensating for a wavelength mismatch between a readout reference beam (8') and a recording reference beam (8) in a holographic storage system (1), and to a holographic storage system (1) implementing the method. According to the invention, the wavelength mismatch (Δλ) is determined (20) and the direction of at least part of the readout reference beam (8') relative to a holographic storage medium (10) is adjusted (22,23) in dependence on the determined wavelength mismatch (Δλ). The recording wavelength is recorded on the recording medium.
摘要:
The present invention relates to a method for servo control in a holographic storage system (1), and to a holographic storage system (1) using such method for servo control, which allows a correct focusing of the holographic beams despite tolerances within the optics and the holographic storage medium. According to the invention, a method for servo control in a holographic storage system (1) for holographic storage media (9) with a servo layer (92) for generating a servo signal using a servo light beam (14), is characterized in that an additional servo signal is generated from a reconstructed signal beam (10) .
摘要:
The present invention relates to a holographic storage system (1), and more specifically to a method for pixel detection in a coaxial holographic storage system. In a holographic storage system (1) according to the invention, with a coaxial arrangement of an object beam (3) and a reference beam (2) the bright pixels within the object beam (3) have a phase shift of essentially π relative to the reference beam (2). For readout of a data page contained in a reconstructed object beam (10) a detector (11) detects an interference pattern generated by the interference between the reference beam (2) and the reconstructed object beam (10).
摘要:
The present invention relates to a method for recording data pages in a holographic recording medium, and more specifically to a method for compensating for sensitivity variations of the holographic material of the holographic recording medium. According to the invention, a method for recording data pages on a holographic recording medium has the steps of: - modulating a light beam with a spatial light modulator to generate (11) a data page with data to be recorded, and - applying (12) a compensation profile to the data pages during recording for reducing contrast variations in the reconstructed data pages.