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Mixed super-resolution optical head

A super-resolution and hybrid technology, applied in the direction of optical recording head, beam guiding device, etc., can solve the problems of affecting the quality of signal reading, affecting the intensity of detection light, and large side lobes, so as to achieve easy reading and detection, and reduce Effect of sidelobe crosstalk and small sidelobe

Inactive Publication Date: 2006-09-27
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI +1
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Problems solved by technology

Although this structure can compress the central light spot, it will generate large side lobes at the same time, which will cause crosstalk during the signal reading process and affect the signal reading quality
Moreover, since the phase plate is placed behind the beam splitter in this structure, the light returning to the photodetector will be attenuated twice by the phase plate, which will greatly affect the intensity of the detection light.

Method used

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Embodiment Construction

[0024] specific implementation

[0025] figure 1 It is a structural principle diagram of a specific embodiment of the present invention. Depend on figure 1 It can be seen that the hybrid super-resolution optical read head of the present invention is composed of a semiconductor laser 1, a collimator lens 2, a hybrid super-resolution phase plate 3, a beam splitter 4, a read-write objective lens 5, a focusing lens 7, and a spot detector 8 , the optical disc 6 is placed behind the read-write objective lens 5, and is characterized in that a hybrid super-resolution phase plate 3 is added in front of the beam splitter 4 and is coaxial with the objective lens 5, and the hybrid super-resolution phase plate can control the passing light Amplitude and phase distribution.

[0026] There are many kinds of hybrid super-resolution phase plates, such as: CN200410066745.4 three-dimensional super-resolution complex amplitude super-resolution filter proposed by Yun...

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Abstract

This invention relates to a mixed super-resolution optical head, which comprises in turn a semiconductor laser, a collimation lens, a beam splitter, a read-write objective lens, a focusing lens and a photoelectric detector. Besides, arranging a hybrid super-resolution phase plate unlike the CN200410093317.0 on the light path between the collimation lens and CD that is coaxial with system and can simultaneous control light amplitude and phase distribution to obtain smaller focusing facula side lobe and improve signal read-write quality.

Description

Technical field [0001] The high-density disc optical read head uses optical super-resolution technology to increase the storage density of discs. Background technique [0002] With the development of computer multimedia technology and the popularization of computer networks, ultra-high density, ultra-large capacity, and ultra-fast information storage technology has attracted widespread attention. Optical storage technology using photons as information carriers has special advantages that traditional storage technologies do not have. In recent years, it has continuously made major breakthroughs in technology and achieved great success in market applications. In order to further increase the storage density of optical discs, a lot of research work has been done. The most direct way to increase the storage density is to reduce the size of the focused spot, but limited by the diffraction effect, the radius R of the focused spot is proportional to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/12G11B7/135
Inventor 赵晓枫阮昊
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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