CN1306486C - Parallel optical information writing and reading method - Google Patents

Abstract

A parallel optical information writing and reading method, which uses laser light as information writing light, uses light-emitting diode or information writing laser as information reading light; uses spatial light modulator as parallel information input element, uses CCD camera to add The image acquisition card is used as a parallel information readout device, and the sample film of photonic material is used as the information storage and recording medium; the information loaded on the spatial light modulator is micro-imaged and written on the storage recording medium film with a high-resolution imaging lens When reading information, the information stored on the recording medium film is amplified and imaged on the photosensitive surface of the information readout device. The light splitting element is used to connect the spatial light modulator, the information readout device and the high-resolution imaging lens, so that the information writing light and the readout light enter the storage recording medium film and the information readout device from different directions respectively. The method can simultaneously write and read 1024*768-bit information each time, realizing parallel high-speed access of information data.

Description

Parallel Optical Information Writing and Reading Method

technical field

The invention relates to a high-speed optical information writing and reading method, in particular to a parallel high-speed optical information writing and reading method using a spatial light modulator as an information input element and a CCD as an information reading element.

Background technique

With the popularity and rapid development of computer multimedia and networks, the amount of data to be processed and stored has increased significantly, and optical information storage technology has become one of the important pillars of today's information science and technology. Optical storage materials are mainly divided into photothermal materials and photonic materials; in terms of storage methods, they are divided into serial and parallel. At present, relatively mature rewritable optical discs adopt the serial read and write method of photothermal materials. The recording speed of photothermal materials is limited by the heating process, and the serial reading and writing method can only read and write 1 bit of information at a time, so the recording and reading speed is greatly limited.

Contents of the invention

The purpose of the present invention is to provide a parallel optical information writing and reading method using photon-type materials as a storage recording medium; Technical issues subject to great limitations.

Technical solution of the present invention is:

A method for writing and reading out parallel optical information, which is special in that: the method includes

1). Use the laser output by the laser as the information writing light; use the light-emitting diode or the information writing laser as the information reading light;

2). Transform the thin laser beam output by the laser into a thick parallel laser beam through a beam expander collimator; convert the thick parallel laser beam into incoherent light through a coherent light to incoherent light converter, and illuminate with incoherent light spatial light modulator;

3). Use a spatial light modulator as a parallel information input element, use a CCD camera plus an image acquisition card as a parallel information readout device, use a sample film of a photonic material as an information storage recording medium, and use a high-resolution imaging lens to load the The information on the spatial light modulator is micro-imaged on the sample film; the spatial light modulator, the parallel information readout device and the high-resolution imaging lens are connected through the light splitting element, so that the information writing light and the information reading light are separated from different directions. Enter the sample film and parallel information readout device;

4). By fine-tuning the high-resolution imaging lens, the parallel information readout device can clearly observe the surface of the sample film;

5). Use a computer to load images or digitally coded information on the spatial light modulator; by fine-tuning the spatial light modulator, the parallel information readout device can clearly see the image or digitally coded information and the surface of the sample film at the same time;

6). Use the shutter control information to write the exposure time, and store the information on the spatial light modulator on the sample film;

7). The information stored on the sample film is amplified and imaged on the parallel information readout device through a high-resolution imaging lens; the polarizer in front of the parallel information readout device is adjusted to control the light intensity entering the parallel information readout device. Information readout devices capture images or digitally encoded information to a computer;

8). Decode the captured digital coded information by computer to restore the original information;

9). The movement of the two-dimensional micro-moving platform is controlled by the computer, and different positions of the sample film placed on the two-dimensional micro-moving platform can be replaced, and new images or digital code information can be stored again;

10). Precise addressing of the two-dimensional micro-movement platform is controlled by the computer, and the information stored in different positions of the sample film can be read out.

The recording material of the above-mentioned sample film can be a photonic material with optical bistability.

The storage disc of the above sample film can adopt a transmissive structure or a reflective structure.

The recording material of the above-mentioned sample film is preferably photochromic material; the above-mentioned laser can be a continuous laser or a pulsed laser whose wavelength matches the recording material of the sample film.

The above-mentioned light-splitting element can use a polarization beam-splitter prism or a polarization-coated beam-splitter, and the best solution is to use a polarization beam-splitter prism.

The above-mentioned high-resolution imaging lens can adopt a long working distance plan microscope objective lens, and can also adopt a large-field-of-view high-magnification aberration-eliminating miniature imaging lens.

The present invention has the following advantages:

1. The parallel optical information writing and reading method is adopted, and the amount of information written and read out each time is large. 1024*768 bits or more of information can be written and read at a time.

2. The present invention is a high-speed parallel optical information writing and reading scheme based on the characteristics of photonic materials; since there is no thermal effect, the response speed is very fast.

Detailed ways

The present invention stores analog images or digitally coded information on photon-type materials, realizes parallel high-speed access of information data, and can write or read 1024×768 bits or more information each time, which is based on the characteristics of photon-type materials High-speed parallel optical information writing and reading method. The optical storage material used in the present invention can be a photonic material with optical bistability, such as a photochromic material. The future development direction of optical storage is the parallel reading and writing of photonic materials. Photonic material optical storage utilizes the direct effects of electronic energy level transition, redistribution, or chemical bond isomerization after the material absorbs photons, so that the recording medium produces physical or chemical changes to achieve storage. Since there is no thermal effect, the response speed can be fast.

In the present invention, information writing light is generated by a laser. The laser can be a continuous or pulsed laser with a wavelength matched to the photosensitive recording material. Write exposure time with precise shutter control information. Use a spatial light modulator as a parallel information input element; use a CCD camera plus an image acquisition card as a parallel information readout device; use a photonic material sample film as an information storage recording medium; use a high-resolution imaging lens to load the data in the spatial light modulator The information stored on the image is miniaturized and written on the information storage recording medium; when the information is read, the information stored on the information storage recording medium is enlarged and imaged on the photosensitive surface of the information readout device; the light splitting element is used to connect the spatial light modulator , information readout device and high-resolution imaging lens, so that information writing light and readout light enter the information storage recording medium and information readout device from different directions respectively; place coherent light to incoherent light in front of the spatial light modulator The converter illuminates the spatial light modulator with incoherent light; a beam expander collimator is placed between the laser and the coherent light to incoherent light converter to convert the thin laser beam output by the laser into a thick parallel laser beam; in the information A light intensity control polarizer is placed in front of the readout device to control the light intensity entering the information readout device; the information storage recording medium is placed on a two-dimensional micro-movement platform that can be programmed and controlled by a computer for addressing operations; use light-emitting diodes or information writing The laser light is read out as information. The parallel information readout device can also use a CMOS camera plus an image acquisition card, or a digital camera. The information storage recording medium is a photonic material film with optical bistable state, such as a photochromic material film. The storage disk of the information storage recording medium may be of a transmissive structure or a reflective structure. The transmissive structure is to directly prepare the recording material film on the optical glass substrate. In the reflective structure, a quarter-wave plate is first coated on the surface of the total reflection mirror, and then a thin film of recording material is prepared on the quarter-wave plate. The quarter-wave plate plays a role in changing the polarization direction of the reflected light. The high-resolution imaging lens is a long working distance plan microscope objective lens, or a large field of view high magnification aberration-free miniature imaging lens. The beam-splitting element is a polarization beam-splitter prism or a polarization-coated beam-splitter, and the best solution is to use a polarization beam-splitter prism. The converter from coherent light to incoherent light can be composed of a piece of frosted glass driven by a micro motor (patent ZL 02 2 62008.7), or a device that vibrates a piece of ground glass driven by a vibrator. It plays the role of converting the coherent light emitted by the laser into incoherent light, which can eliminate the noise signal brought by the coherent light and improve the signal-to-noise ratio of recording and reading information.

Information readout light: when the information storage and recording medium is a transmissive structure storage disk, use a light emitting diode as the readout light. Its feature is that light-emitting diodes with different wavelengths can be replaced, and different wavelengths of illumination light can be generated for different absorption samples to improve the quality of readout images (patent ZL 02 2 62126.1). Light-emitting diodes are used as the light source for illumination and readout. A polarizer and a condenser objective lens are added in front of the light-emitting diodes. The condenser objective controls the illumination light to only concentrate on the sample area where the information is to be read out. The polarizer can polarize the readout light, which is beneficial All the readout light enters the image readout device through the polarization beam splitter, so as to reduce the intensity of the required readout light and reduce the erasing effect of the readout light on the written information.

Information readout light: when the information storage and recording medium is a reflective structure storage disk, use the information writing laser as the readout light. At this time, the spatial light modulator is loaded with a white screen, and the laser power is weakened, and the light reflected from the sample film can enter the information readout device for reading.

The spatial light modulator can be controlled by a computer to load analog images or digitally encoded information to be stored. The spatial light modulator can adopt various transmissive spatial light modulators with different resolutions; the information readout device can read the information written on the sample film and store it in the computer. The imaging quality of the high-resolution imaging lens determines the storage density of the system. The two-dimensional micro-moving platform is used to fix the sample film, and its precise movement and positioning can be controlled by computer programming to achieve addressing.

Claims (6)

1. Information written into the parallel-ray method and the read out, it is characterized in that: this method comprises

1). the laser with laser instrument output is write light inlet as information; Write laser with light emitting diode or information and read light as information;

2). the narrow laser beam of laser instrument output is transformed to thick collimated laser beam by the beam-expanding collimation device; Thick collimated laser beam is converted to incoherent light through coherent light to incoherent optical converter, with incoherent light lighting space photomodulator;

3). use spatial light modulator as the parallel information input element, add image pick-up card as the parallel information read-out device with ccd video camera, as the Infostorage Record medium, the information micro that will be carried on the spatial light modulator with high resolution imaging lens is imaged onto on the sample thin film with the sample thin film of photon type material; By beam splitter connection space photomodulator, parallel information read-out device and high resolution imaging lens, make information write light inlet and read light with information and enter sample thin film and parallel information read-out device respectively from different directions;

4). by the fine setting high resolution imaging lens, make the parallel information read-out device can clearly observe the sample thin film surface;

5). with computing machine load image or digital code information on spatial light modulator; By the fine setting spatial light modulator, make the parallel information read-out device can clearly see image or digital code information and sample thin film surface simultaneously;

6). write the time shutter with the shutter control information, with the information stores on the spatial light modulator to sample thin film;

7). be stored in information via high resolution imaging lens amplification imaging on the sample thin film to the parallel information read-out device; Regulate the preceding light intensity control polaroid of parallel information read-out device, the light intensity that control enters the parallel information read-out device captures computing machine by the parallel information read-out device with image or digital code information;

8). by computing machine the digital code information that captures is decoded, recover raw information;

9). move by the little platform that moves of computer control two dimension, change and be placed on the little diverse location that moves sample thin film on the platform of two dimension, can store new image or digital code information again;

10). by the two-dimentional little accurate addressing of platform that moves of computer control, can read sample thin film diverse location canned data.

2. Information written into the parallel-ray method and the read out according to claim 1 is characterized in that: the recording materials of described sample thin film are the photon type material with optical bistability.

3. Information written into the parallel-ray method and the read out according to claim 1 and 2 is characterized in that: the storage disks of described sample thin film is transmission-type structure or reflective structure.

4. Information written into the parallel-ray method and the read out according to claim 3 is characterized in that: the recording materials of described sample thin film are photochromic material; Described laser instrument is the continuous wave laser or the pulsed laser of the recording materials coupling of wavelength and sample thin film.

5. Information written into the parallel-ray method and the read out according to claim 3 is characterized in that: described beam splitter is polarization splitting prism or polarization plated film beam splitting chip.

6. Information written into the parallel-ray method and the read out according to claim 5 is characterized in that: described high resolution imaging lens is a long reach flat field microcobjective, or big visual field high magnification anaberration micro imaging lens.