Laser read-write lens of holographic optical disk memory

A memory and lens technology, applied in the field of optical storage, can solve the problems of poor quality of reference light spot, pixel matching of spatial light modulator in holographic optical disc memory, etc.

Inactive Publication Date: 2006-04-12
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of pixel matching between the spatial light modulator and the area array photocoupler of the holographic optical disc storage proposed above, as well as the poor quality of the reference spot and practical application, the present invention proposes a laser for the holographic optical disc storage based on the Fourier transform hologram read and write lens

Method used

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  • Laser read-write lens of holographic optical disk memory
  • Laser read-write lens of holographic optical disk memory
  • Laser read-write lens of holographic optical disk memory

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to the principle and method in the invention, a laser reading and writing lens for a holographic optical disc memory is designed. Among them, at the wavelength of 532nm, the Fourier transform lens FTL 1 Focal length is 100mm, Fourier transform lens FTL 2 The focal length is 40mm. The invention can meet the pixel matching requirements of the laser read-write lens of the holographic optical disk memory whose size ratio of the pixel of the spatial light modulator and the pixel of the area array photocoupler is 5:2. Optical structure such as figure 2 As shown, the Fourier transform lens group FTL 1 and FTL 2 to FTL 1 The first lens surface of the first group is numbered as lens surface 1, and there are 16 surfaces in total.

[0024] lens table

face number

radius of curvature

center thickness

Glass grade

caliber

1

34.26

6.60

ZK11

35

2

-712

0.76

35

3 ...

Embodiment 2

[0029] According to the principle and method in the invention, a laser reading and writing lens for a holographic optical disc memory is designed. Among them, at the wavelength of 532nm, the Fourier transform lens FTL 1 Focal length is 130mm, Fourier transform lens FTL 2 The focal length is 60mm. The invention can meet the pixel matching requirement of the laser read-write lens of the holographic optical disk memory whose size ratio of the pixel of the spatial light modulator and the pixel of the area array photocoupler is 13:6. Optical structure such as figure 2 As shown, the Fourier transform lens group FTL 1 and FTL 2 to FTL 1 The first lens surface of the first group is numbered as lens surface 1, and there are 16 surfaces in total.

[0030] lens table

face number

radius of curvature

center thickness

Glass grade

caliber

1

44.26

8.62

ZK11

46

2

-912

1

46

3 ...

Embodiment 3

[0035] According to the principle and method in the invention, a laser reading and writing lens for a holographic optical disc memory is designed. Among them, at the wavelength of 532nm, the Fourier transform lens FTL 1 Focal length is 150mm, Fourier transform lens FTL 2 The focal length is 75mm. The invention can meet the pixel matching requirements of the laser read-write lens of the holographic optical disc memory whose pixel size ratio of the spatial light modulator and the area array photocoupler device is 2:1. Optical structure such as figure 2 As shown, the Fourier transform lens group FTL 1 and FTL 2 to FTL 1 The first lens surface of the first group is numbered as lens surface 1, and there are 16 surfaces in total.

[0036] lens table

[0037] FTL 1 and FTL 2 After combination, when the modulation transfer function MTF is 401p / mms, it is greater than 0.5 in the full field of view, and the distortion is less than 0.012%.

[0038] 2. Reference light ...

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Abstract

This invention relates to a laser read-write lens of a optical-disk storage, in which, two Fourier transformation lens sets are serial and in the structure of asymmetrical structure, the anaberration and aberration design is carried out according to the pixel diameter of the special light modulator and a face array photoelectric coupler to match the lens set amplification rate, the optical axis of the anaberration reference lens and the Fourier transformation lens forms a angle and two Fourier transformation lens and the reference optical lens form a laser read-write lens of a three lens combined optical-disk storage.

Description

technical field [0001] A laser reading and writing lens for a holographic optical disc storage belongs to the technical field of optical storage. Background technique [0002] As a new type of high-density optical storage system, optical holographic memory is attracting great attention in the research field due to its advantages of large storage capacity, high redundancy, fast data transmission rate and short access time. At present, due to the maturity of related technologies such as solid-state lasers, high-resolution spatial light modulators, and high-resolution high-speed photodetectors, high-density optical holographic storage is becoming more and more practical. According to different situations and needs, optical holographic information storage includes storage methods such as Fresnel holography, image plane holography, and Fourier transform holography, among which Fourier transform holograms have spatial displacement invariance, making them advantageous in space mult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/0065G11B7/135G11B7/1372
Inventor 王也陶世荃万玉红王大勇江竹青刘长江
Owner BEIJING UNIV OF TECH
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