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公开(公告)号：JP2002040908A
公开(公告)日：2002-02-08
申请号：JP2001167199
申请日：2001-06-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CURTIS KEVIN RICHARD , HILL ADRIAN JOHN , TACKITT MICHAEL C
Abstract: PROBLEM TO BE SOLVED: To provide a method for storing space multiplexing holograms of a skip sort which solves the problem of crosstalk, image distortion and physical change of a medium which are met in a recording process using an optical polymer medium. SOLUTION: By skip sort technique of this invention, holograms are stored in a layer of a row and consequently almost uniform background exposure can be obtained in succeeding layers.
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公开(公告)号：JPH11119124A
公开(公告)日：1999-04-30
申请号：JP17740598
申请日：1998-06-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAMPBELL SCOTT PATRICK , CURTIS KEVIN RICHARD , TACKITT MICHAEL C
IPC: G02B26/08 , G11B7/0065 , G11B7/09
Abstract: PROBLEM TO BE SOLVED: To send an objective light beam to the prescribed position of a holographic memory cell(HMC) by arranging the HMC in the vicinity of a second focal plane for receiving a beam at a location being the function of a desired direction. SOLUTION: The angular displacement θ of an image reflected by a rotatable mirror 305 generates the positional displacement ΔR of an image reflected by the mirror 305 in the HMC 310. Thus, rotation of the mirror 305 from a first position i.e., an original position to a second position i.e., the rotated position generates the positional displacement ΔR of the image in the HMC 310. The image by the movement of the mirror 305 traces a circular path 312 on the front surface of the HMC 310. First, when the mirror 305 is rotated by an angle θ, the normal is located on an axis B by the moving angle ω1, the image in the HMC 310 is converted to the point ω1 by ΔR. When the axis B is moved to a moving angle ω2 about an axis A, the image in the HMC 310 is converted to the point ω2, the position is a place separated by ΔR from the center of the circular path 312.
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公开(公告)号：JPH11101946A
公开(公告)日：1999-04-13
申请号：JP17741098
申请日：1998-06-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAMPBELL SCOTT PATRICK , CURTIS KEVIN RICHARD , TACKITT MICHAEL C
IPC: G11B7/09 , G02B26/08 , G03H1/22 , G03H1/26 , G11B7/0065
Abstract: PROBLEM TO BE SOLVED: To enable the control of the spatial modulation composite incident light beam of coherent light by moving first and second reflection elements in such a manner that the incident beam irradiates the location which is the function of the movement of first and second reflection elements. SOLUTION: In the position where a mirror 310 and a mirror 315 move parallel, the object light is made incident at the point A on the surface of the mirror 310 and is thereafter reflected toward the point E on the surface of the mirror 315. The object light is again reflected toward the point D on the surface of a hologram memory cell(HMC) 330 at this point E. The object light intersects orthogonally with this HMC 330. In such a case, the distance at which the object light moves by passing the point D from the point A is equal to the distance which the object light moves from the point A to the point F. The parallel moving quantity Δ1 of the mirror 310 and the mirror 315 is the parallel moving quantity Δ2 at the HMC 330 and this parallel moving quantity Δ2 depends on the direction of the mirror 310 and the mirror 315 and the absolute positions thereof.
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公开(公告)号：JPH11101945A
公开(公告)日：1999-04-13
申请号：JP17740898
申请日：1998-06-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAMPBELL SCOTT PATRICK , CURTIS KEVIN RICHARD , TACKITT MICHAEL C
Abstract: PROBLEM TO BE SOLVED: To enable the control of a composite incident light beam direction by allowing an incident beam to irradiate the location which is the function of the moving quantity of two reflection elements on the plane of a holograph memory cell(HMC) and the rotating position of the HMC. SOLUTION: A driving arm rotates a mirror 310 and a mirror 320 by the same quantity by a rotational control mechanism in such a manner that the angle formed by the surfaces of these mirrors is kept constant. Object light 311 is reflected from the mirrors 310, 320 and enters the HMC 330. When the mirrors 310, 320 rotate, the object light is reflected along an optical path and enters the surface of the HMC 330 with a deviation by a distance ΔR. This object light is maintained at the specified incident angle on the HMC 330 even if the direction thereof is changed. The optical path length of the object light is thus kept constant even if the mirrors 310, 320 rotate. The direction control is achieved on the second axis of a cylindrical coordinate diameter (R, ϕ) by the angle ϕ of swiveling of the HMC 330.
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公开(公告)号：JPH1184269A
公开(公告)日：1999-03-26
申请号：JP17740698
申请日：1998-06-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAMPBELL SCOTT PATRICK , CURTIS KEVIN RICHARD , TACKITT MICHAEL C
Abstract: PROBLEM TO BE SOLVED: To send the beam of high spacial band width product to another area of the front surface of a holographic memory cell (HMC) without the defocusing state by providing a finely controlled moving mechanism so that a light beam scans the surface of the HMC with a specified increment. SOLUTION: A light source 300 radiates a planar wave objective beam e.g. a coherent laser beam inside a two-dimensional pattern on a spacial light modulator 302. The light beam is radiated from the original position i.e., a point A on the front surface of the spacial light modulator 302. A convex lens 304 converges the light beam on the point B of the output image on the HMC 306. An actuator 320 is connected to the spacial light modulator 302 by a shaft 322, etc., and moves the spacial light modulator 302 by a distance R1 . The point A is moved to a point A' by the distance R1 and the light beam is radiated from the point A' being the position after movement on the front surface of the spacial light modulator 302. The convex lens 304 converges the light beam on the point B' of the moved output image of the HMC 306.
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Patent Agency Ranking
公开(公告)号：JP2002006723A
公开(公告)日：2002-01-11
申请号：JP2001111421
申请日：2001-04-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CURTIS KEVIN RICHARD , TACKITT MICHAEL C
Abstract: PROBLEM TO BE SOLVED: To provide a holograph system which reduces and avoids introduction of aberrations to the system and, especially, reduces aberrations introduced by a non-picture component like a storage medium. SOLUTION: The storage medium is arranged in an optical path of the system and is rotated around a first axis so that the surface of the storage medium may have non-orthogonal relation to the optical path, and a space optical modulator arranged in the optical path is rotated around a second axis orthogonal t the first axis, and the surface of the space optical modulator has non- orthogonal relation to the optical path.
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公开(公告)号：JPH11120609A
公开(公告)日：1999-04-30
申请号：JP17740798
申请日：1998-06-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAMPBELL SCOTT PATRICK , CURTIS KEVIN RICHARD , TACKITT MICHAEL C
IPC: G03H1/02 , G03H1/22 , G11B7/0065 , G11B7/085 , G11B7/135
Abstract: PROBLEM TO BE SOLVED: To direct substance lights to the prescribed position of a HMC (hologram memory cell) by arranging the HMC rotatably with respect to the axis of a HMC surface in the vicinity of the focal plane formed by refractingly transmitting the beams which are reflected with reflection elements. SOLUTION: A rotatable mirror 320 rotates within an angle θ to transmit reflected beams through a lens 325 to form an image on a HMC 330. Here, the angular displacement θ of the reflection image generates the positional displacement ΔR of an image which is reflected on the HMC 330 by the mirror 320 and the image being on the HMC 330 becomes in a focused state regardless of the rotation angle of the mirror 320 whilst the ΔR is scanned in an adequate range. A fixed mirror 310, a lens 315 and the rotatable mirror 320 are respectively mounted at fixing positions on a drive arm 335. The radius of the mirror 320 is fixed with respect to the angle θof the mirror. A rotation control device 340 turns the arm 335 on the orbit of 360 degrees according to a turning angle 4. Thus, the direction of the image reflected from the rotatable mirror 320 to the HMC 330 is controlled with ϕ and θ.
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公开(公告)号：JPH1152828A
公开(公告)日：1999-02-26
申请号：JP15406098
申请日：1998-06-03
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CURTIS KEVIN RICHARD , TACKITT MICHAEL C
IPC: G03H1/22 , G03H1/02 , G03H1/26 , G11B7/0065
Abstract: PROBLEM TO BE SOLVED: To reduce the destructive effect caused by double refractivity against a diffraction efficiency by providing the comparison light beams, which are used for a reproducing, with a different polarization than the polarization of the comparison beams used for a recording. SOLUTION: When information is stored in a storage medium 14, reference light beams 22 are crossed against a storage medium 14 at the same position, to which the beams 22 are directed during an information storage, with a same angle and a same wavelength in order to retrieve the information. The beams 22 are called as storage comparison beams during the storage process of information on the storage medium and called as reproducing comparison beams during information retrieving and reproducing processes. A storage medium frequently shows the double refractivity, which is larger than 5 deg. at the information stored position by a coherent storage. Therefore, the diffraction efficiency of the system is improved by generating the reproducing comparison beams which have a different polarization than the polarization of the storage comparison beams. Note that the degree of the adjustment on the polarization and the obtained improvement level depend on indivisual systems.
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公开(公告)号：DE60001636T2
公开(公告)日：2003-12-18
申请号：DE60001636
申请日：2000-12-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CURTIS KEVIN RICHARD , HILL ADRIAN JOHN , TACKITT MICHAEL C
Abstract: The invention relates to a skip-sorted spatial multiplexing holographic storage technique that addresses the problems of crosstalk, image distortions, and physical change of the medium encountered in current recording processes in which photopolymer media are used. The skip-sorted technique involves storing holograms in layers of arrays, such that a substantially uniform background exposure is provided for subsequent layers.
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公开(公告)号：DE60001636D1
公开(公告)日：2003-04-17
申请号：DE60001636
申请日：2000-12-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CURTIS KEVIN RICHARD , HILL ADRIAN JOHN , TACKITT MICHAEL C
Abstract: The invention relates to a skip-sorted spatial multiplexing holographic storage technique that addresses the problems of crosstalk, image distortions, and physical change of the medium encountered in current recording processes in which photopolymer media are used. The skip-sorted technique involves storing holograms in layers of arrays, such that a substantially uniform background exposure is provided for subsequent layers.
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