TWI354987B - Storage device - Google Patents

Description

1354987 IX. Description of the Invention: [Technical Field] The present invention relates to a holographic storage device, and more particularly to a holographic storage device for difference in optical energy density between a high-order item and a high-order item. ^ [Prior Art] With the launch of high-quality digital TV, and even the future 3 〇 stereo

J, by the improvement of living standards, people's demand for storage media capacity is also △. In today's optical storage technology, the amount of optical discs is almost at its limit and cannot be upgraded upwards. Therefore, it is imperative to develop its larger optical storage technology. The era of light storage into high capacity is a must-have trend. The holographic image is stored as a lower-generation large-capacity technology, which can reach the level above IT byte. However, in order to achieve this capacity, the full utilization of materials is very important. . Three methods for reducing the bit error rate BER (Bit Err〇r her) of the holographic storage device S: the first method is as shown in the first figure (10) Na) Recording system 'where the spatial modulator (SLM) 51 is disposed at the front focal plane of the Fourier lens "storage medium 53 ^ on the light output side of the Fourier lens 52, so the holographic data is recorded on the storage medium 53 by means of coke. The main technical system of this method will record The plane defocusing increases the recording area, and the density of each step can be narrowed. The second method is the phase mask shown in the second figure, and the spatial modulator 51 is disposed at the front focal plane of the Fourier lens 52. The storage medium 53 is disposed on the light exit side of the Fourier lens 52. The phase mask 54 is disposed between the spatial modulator 51 and the Fourier lens 52 by changing the relative phase of each pixel (Pixel). Near-order optical energy density. The third method is the conical lens (Ax1C〇n) shown in the third figure, and the conical lens 55 is placed in front of the spatial modulator 51 to change the geometric distribution of the incident light. To change the light energy [invention content] A holographic storage device, by means of a first filter element disposed between the first Fourier lens and the second Fourier lens, for the energy of the (11 DC) term, and the zeroth order and the higher order The energy between the items is different and different, and interferes with the reference beam, so that the recording signal can be written into the dot shutter array, and the recording capacity can be increased at the same time. A holographic storage device comprising a light source generator enables Generating a light beam, a first light splitting component, dividing the light beam into a signal light and a f test beam, a spatial modulator, receiving the signal light and encoding; a first: Fourier lens, disposed in the space modulation The light output side of the transformer passes the signal light through a second Fourier lens disposed on the light output side of the first Fourier lens to pass the signal light; a first filter element is disposed on a Fourier plane And (Fourier Piane) between the first Fourier lens and the second Fourier lens, the signal light passes through the first filter element, a first beam splitting element, and the light disposed in the second Fourier lens Output side, let the signal light pass a first lens disposed on a light output side of the second beam splitting element; and a storage medium disposed on a light output side of the first lens, the light passing through the first lens and the reference beam The interference pattern is recorded on the storage medium. The first beam splitting element and the second beam splitting element are a polarization beam splitter. The spatial modulator is disposed at a focal plane position of the first Fourier lens. 1354987 [Simple description of the drawing] The second figure is a schematic diagram of a conventional defocus recording system. The second figure is a schematic diagram of a conventional phase mask system. The third figure is a schematic diagram of a conventional Axicon system. The fourth figure shows a schematic diagram of the write path of the holographic storage device of the present invention. The fifth figure shows an enlarged view of the circle A in the fourth figure. The sixth figure is a schematic diagram of the image of the invention in the Fourier plane. The seventh figure is a schematic diagram of the image simulation of the Fourier plane of the present invention. The eighth figure is the waveform diagram of the original signal. The ninth figure is a schematic diagram of a portion of the direct current (DC) term filtered by the filter element. Both the tenth and eleventh figures show schematic diagrams of the absorption of zero-order light energy. Fig. 12 is a view showing the reading optical path of the holographic storage device of the present invention. The thirteenth image shows an enlarged view of the circle B in the twelfth figure. Fig. 14 is a view showing another reading light path of the holographic storage device of the present invention. [Main component symbol description] 1...Full image storage device 2 - Light source generator 3 - First light splitting element 4 - Spatial modulator 5 - First Fourier lens 6 - Second Fourier lens 13 1354987 7, 71---first filter element 8 - - second beam splitter 9 - - first lens 10 - storage medium 11 ... third beam splitter 12 ... first reflective element 13 ... second reflective element 14 - third Reflecting element 15...photodetector 16 - third Fourier lens 17 ... fourth Fourier lens 18 - second filter element 21 - beam 31 - signal light 32 ... reference beam

Claims (1)

1354987. . _ * 'Revision of the replacement page on September 8th, 100. Patent application scope: 1. A storage device comprising: a light source generator for generating a light beam; a first light splitting element for dividing the light beam a signal light and a reference beam; a spatial modulator that receives and encodes the signal light; a first Fourier lens disposed on the light output side of the spatial modulator to pass the signal light; a Fourier lens is disposed on the light output Φ side of the first Fourier lens to pass the signal light; a first filter element is disposed between the first Fourier lens and the second Fourier lens to make the signal Light passing through; a second beam splitting element disposed on a light output side of the second Fourier lens to pass the signal light; a first lens disposed on a light output side of the second beam splitting element; and a storage medium a focus position of the first lens, wherein the interference pattern formed by the signal light of the first lens and the reference beam is recorded on the storage medium; wherein the first filter element is The energy of the first Fourier lens receiving information in the signal light of the zero order light, thereby reducing the energy density of the zero-order light, and light energy closer to each order. 2. The storage device of claim 1, wherein the first beam splitting element and the second beam splitting element are a polarizing beam splitting element. 3. The storage device of claim 1, wherein the spatial modulator is disposed at a focal plane position of the first Fourier lens. 4. The storage device of claim 1, wherein the first filter element is disposed at a focal plane position of the first Fourier lens. 15 5. For example, the application of the fascination of the fascination of the 100 100 100 :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: 6. 6. 6. 6. A storage device according to the invention, wherein the storage device 佶 ti: the storage device of the first aspect of the patent, further comprising - a light beam that induces diffraction from the storage medium. The storage device of item 7, wherein the photodetector J: a complementary emulsified metal-semiconductor detector (CMOS Sensor), when the test beam is directed to the storage medium, and reconstructed into an encoded object 'f' The encoded object beam passes through the first lens and the second splitter. The second spectroscopy element-side is received by a complementary oxidized metal semiconductor 4 CMOS sensor. 9. The storage device of claim 8, wherein the complementary metal semiconductor CMOS sensor comprises a signal processor that increases the energy of one end by one step. 10. The storage device of claim 8, wherein the reference beam is a polarization phase common reference beam. 11. The storage device of claim 7, wherein the photometric detector is for a photosensitive coupling element (CCD), and the reference beam is directed toward the storage medium and reconstructed into a coded object beam. The coded object beam is received by the photosensitive element (CCD) provided on the second beam splitting element via the first lens and the second beam splitting element. 12. The storage device of claim 7, wherein a third Fourier lens, a fourth Fourier lens, and a second filter element are disposed between the photodetector and the second beam splitter. The second beam splitting element enters the optical signal of the photodetector for processing. The storage device according to claim 12, wherein the third Fu 1354987 On September 8, 100, the modified LI lens and the fourth Fourier lens system were used to read the (pixel match). The storage device according to claim 1, wherein the scoop-second spectroscopic 7C member, the first reflecting element, the second reflecting element=the third reflecting element, pass the reference beam The third splitter is incident on the first reflective element; and when written, the reference two-th reflective element reflects the reference beam to the second reflective element onto the storage medium, and when read, The reference beam reflects the reference beam from the first reflective L piece through the third reflective element onto the storage medium. Where 15. The holographic storage device of claim 14, wherein the three-beam splitting element is a polarized beam splitting element. 8. The storage device of claim 1, wherein the first mirror is a light storage lens. 17. The storage device of claim 1, wherein the central position of the first optical element is a circular absorption point. /' ^ , 18. The storage device of claim π, wherein the periphery of the central circular absorption point of the first optical element is blackened. , 〇 ~ 19. A storage device comprising: a light source generator for generating a light beam; a first beam splitting element divided into a signal light and a reference beam; - a second beam splitting element 'located on the light side of the second Fourier lens to pass the signal light; a first lens disposed on a light output side of the second beam splitting element; a storage medium disposed at a focus position of the first lens, and an interference pattern formed by the signal light of the first lens and the reference beam Recorded on the storage medium; and a round-light detector to sense the light beam diffracted from the storage medium, the 17 1354987 September 8, 100 correction between the 4-page optical detector and the second splitting element There is an i-four-five lens four-Fourier lens and a second filter element to make the reference beam shape philosopher! The second foliar lens, the second filter element, and the fourth Fourier lens are received by the photodetector. The storage device of claim 19, wherein the first beam splitting element and the second beam splitting element are a polarizing beam splitting element. 21. The storage device of claim 19, wherein the storage medium is a disk-shaped storage medium. The storage device of claim 21, wherein the photodetector is a complementary oxidized metal semiconductor detector (CMOS Sens0r), when the reference beam is directed toward the storage medium, Reconstruction is reduced to a zero beam of a coded object, and the coded object beam passes through the first lens, the second beam splitting element, and the complementary oxidized metal conductor j detector (CMOS Sensor) on the side of the second beam splitter element 23. The storage device of claim 22, wherein the complementary metal oxide semiconductor detector (CM〇s Sens〇r) comprises a signal processor for raising a terminal signal by one order 24. The storage device of claim 19, wherein the reference beam is a polarization phase conjugate reference beam. 25. The storage device of claim 19, wherein the photodetector For the photosensitive coupling element (CCD), when the reference beam is directed to the storage medium and reconstructed and restored to a coded object beam, the coded object beam is passed through the first lens and the second beam splitting element. The storage device according to the invention of claim 19, wherein the third Fourier lens and the fourth Fourier lens system are for reading The optical signal of the photodetector is matched by a pixel match. 8 18 1354987 π The storage-third spectroscopic element, a first storage device, and a third reflective element light according to claim 19 of the patent application scope. After the second reflective element and the first reflective element are incident on the first reflective element, the first component reflects the reference beam through the medium, and when read, the reference 'the shelf reflects the reference beam The third reflecting element element 28. is stored on the storage device according to the scope of the patent application. The optical element is a polarization polarizing element. /, the third point 29. The storage device according to item 19, wherein the mirror is a light storage lens.