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Photon sieve-based blue-ray optical head

A technology of photon sieve and optical head, applied in the field of blue light optical head, can solve the problems of difficulty in design, manufacture and assembly, increase the complexity of focusing objective lens, and be unfavorable for the wide use of products, and achieve the suppression of side lobes and high-order diffraction, Good focusing performance, reducing the effect of dependence

Inactive Publication Date: 2012-10-17
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

At the same time, the high numerical aperture also greatly increases the complexity of the focusing objective lens, making it extremely difficult to design, manufacture and assemble
These have all increased production cost, are unfavorable for the extensive use of product

Method used

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  • Photon sieve-based blue-ray optical head
  • Photon sieve-based blue-ray optical head
  • Photon sieve-based blue-ray optical head

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Embodiment Construction

[0013] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0014] Such as figure 1 As shown: the blue-ray optical head based on photon sieve is composed of blue-ray laser diode 1, collimating lens 2, polarization beam splitter prism 3, polarizer 4, photon sieve 5, optical disc 6, cylindrical lens 7, and photodetector 8; A collimating lens 2, a polarizing beamsplitter prism 3, a polarizer 4, a photon sieve 5 and an optical disc 6 are arranged on the beam line emitted by the diode 1, and a cylindrical lens 7 and a photodetector 8 are arranged on the reflected beam line of the polarization beam splitting prism 3, and the blue light The light emitted by the laser diode 1 becomes parallel light after passing through the collimating lens 2, and the parallel light passes through the pol...

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Abstract

The invention discloses a photon sieve-based blue-ray optical head, which comprises a blue-ray laser diode, a collimating lens, a polarized beam splitter, a polaroid, a photon sieve, an optical disk, a cylindrical lens and a photoelectric detector. Light emitted by the blue-ray laser diode is focused on a surface of the optical disk through the photon sieve after being subjected to beam shaping and is transmitted to the photoelectric detector through a light path after being reflected. The optical head has high compatibility, the blue-ray disc can be read and written only by substituting the photon sieve for a focusing objective lens under the condition that a system structure is not required to be changed, and the length of a light source can be further reduced, so that a large number of data can be stored.

Description

technical field [0001] The invention belongs to the technical field of optical disc storage, and relates to a blue-ray optical head based on a photon sieve. Background technique [0002] With the development of optical storage technology, Blu-ray disc has become a new hot spot. Compared with traditional DVD, Blu-ray has shorter wavelength and smaller focus spot, so Blu-ray disc has larger storage capacity. The size of the focused spot is the decisive factor for optical disc storage, and reducing the spot size can be achieved by shortening the wavelength and increasing the numerical aperture. The light source of the Blu-ray optical head adopts blue laser with a wavelength of 405nm, and the objective lens is composed of multiple lenses that are calibrated at the micron level. However, people have higher and higher requirements on the storage capacity of optical discs, so shorter wavelengths and higher numerical apertures must be used. The shortening of the wavelength not on...

Claims

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Application Information

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IPC IPC(8): G11B7/1353G11B7/1365G11B7/139
Inventor 何渝陈铭勇赵立新唐燕
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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