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    SELF-ALIGNING PHASE CONJUGATE LASER
    1.
    发明申请
    SELF-ALIGNING PHASE CONJUGATE LASER 审中-公开
    自对准相结合激光

    公开(公告)号：WO1987003956A1

    公开(公告)日：1987-07-02

    申请号：PCT/US1986002567

    申请日：1986-11-28

    Applicant: HUGHES AIRCRAFT COMPANY

    Inventor： HUGHES AIRCRAFT COMPANY ,  BYREN, Robert, W. ,  ROCKWELL, David, A.

    IPC: G01B11/27

    CPC classification number: G01B11/27

    Abstract: A method and apparatus for providing a laser beam that is automatically aligned with a substantially rigid, stabilized platform or frame that can be oriented over a wide angular range, such as by the gimbals of a laser pointing and tracking system. A single-transverse-mode master laser oscillator (12) is mounted on the stabilized platform (13) which is part of the inner gimbal, which can be rotated about an elevation axis (16), and a multipass laser amplifier (21) with a phase conjugation mirror (22) and an optional nonlinear frequency-conversion device (20) are located off the inner gimbal. An outer gimbal or pedestal mount permits rotation about an azimuthal axis (17). The laser oscillator (12) and laser amplifier (21) are coupled by means of a beamsplitter (15) and two reflecting elements (18 and 19). The laser media used for the oscillator (12) and amplifier (21) are either the same, or compatible media having the same wavelength. In an alternative embodiment the two reflecting elements are replaced by a flexible light waveguide such as a glass fiber. The phase conjugation mirror (22) compensates the beam for the effects of optical aberrations caused by thermally induced changes in the amplifier medium and the nonlinear medium (if used) and also compensates the beam for angular tilt and jitter in the beam line of sight due to structural flexibility and motion of the stabilized platform. Four different embodiments are described in which the phase conjugation mirror is based on stimulated Brillouin scattering, degenerate four-wave mixing, three-wave mixing, and photon echo effects, respectively.

    BANDWIDTH-PRESERVING BRILLOUIN PHASE CONJUGATE MIRROR AND METHOD
    3.
    发明申请
    BANDWIDTH-PRESERVING BRILLOUIN PHASE CONJUGATE MIRROR AND METHOD 审中-公开

    公开(公告)号：WO1990010889A1

    公开(公告)日：1990-09-20

    申请号：PCT/US1990000914

    申请日：1990-02-22

    Applicant: HUGHES AIRCRAFT COMPANY

    Inventor： HUGHES AIRCRAFT COMPANY ,  ROCKWELL, David, A. ,  LIND, Richard, C. ,  PEPPER, David, M.

    IPC: G02F01/35

    CPC classification number: G02F1/3538 ,  H01S3/305

    Abstract: A coherent input beam from a laser (82) is fed into a Brillouin-enhanced four wave mixer (88) which generates a phase conjugated seed beam in counterpropagation with the input beam. A Brillouin amplifier (86) is provided between the laser and four wave mixer to transfer energy from the input beam (Ep) to the seed beam (Ec) and thereby amplify the seed beam to produce a phase conjugated output beam with approximately 50 % of the energy of the input beam and narrow bandwidth which is free from random phase jumps associated with the acoustic noise generally required to initiate and sustain stimulated Brillouin scattering. The phase conjugated output beam can be modulated or steered in direction, as desired. Reference beams for the four wave mixer may be derived from the same laser source as the input beam and have energies one or more orders of magnitude smaller than the energy of the input beam.

    OPTICAL DEVICE USING STIMULATED BRILLOUIN SCATTERING
    4.
    发明申请
    OPTICAL DEVICE USING STIMULATED BRILLOUIN SCATTERING 审中-公开
    使用刺激式钻石散光的光学装置

    公开(公告)号：WO1989004009A1

    公开(公告)日：1989-05-05

    申请号：PCT/US1988003082

    申请日：1988-09-06

    Applicant: HUGHES AIRCRAFT COMPANY

    Inventor： HUGHES AIRCRAFT COMPANY ,  ROCKWELL, David, A. ,  MANGIR, Metin, S. ,  WHITE, Jeffrey, O. ,  JONES, Dennis, C.

    IPC: G02F01/35

    CPC classification number: H01S3/305 ,  G02F1/3538

    Abstract: The output of an optical device which involves a stimulated Brillouin scattering (SBS) gain medium is enhanced over a range of input beam intensities by providing a gain medium which has a given SBS gain for a given input beam intensity, and modifying the gain medium to reduce its SBS gain coefficient. By lowering the SBS gain coefficient, SBS dominance and suppression of stimulated Raman scattering (SRS) can be mitigated, and the output fidelity of a phase conjugation system with respect to its input can be significantly enhanced. Mechanisms for reducing the SBS gain coefficient include increasing the medium viscosity, thermal conductivity and/or diffusion coefficient, or causing the medium relaxation zone to coincide with the frequency of the phonons involved in the SBS process. Two different media can be mixed together in varying proportions to progressively modify the overall medium SBS gain as the input beam intensity is progressively changed.

    OPTICAL DEVICE USING STIMULATED BRILLOUIN SCATTERING
    5.
    发明公开
    OPTICAL DEVICE USING STIMULATED BRILLOUIN SCATTERING 失效
    受激布里渊散射AUSNÜTZENDE光学设备。

    公开(公告)号：EP0339085A1

    公开(公告)日：1989-11-02

    申请号：EP89900692.0

    申请日：1988-09-06

    Applicant: Hughes Aircraft Company

    Inventor： ROCKWELL, David, A. ,  MANGIR, Metin, S. ,  WHITE, Jeffrey, O. ,  JONES, Dennis, C.

    IPC: G02F ,  G02F1 ,  H01S3

    CPC classification number: H01S3/305 ,  G02F1/3538

    Abstract: The output of an optical device which involves a stimulated Brillouin scattering (SBS) gain medium is enhanced over a range of input beam intensities by providing a gain medium which has a given SBS gain for a given input beam in­ tensity, and modifying the gain medium to reduce its SBS gain coefficient. By lowering the SBS gain coefficient, SBS dom­ inance and suppression of simulated Raman scattering (SRS) can be mitigated, and the output fidelity of a phase conjuga­ tion system with respect to its input can be significantly enhanced. Mechanisms for reducing the SBS gain coefficient including increasing the medium viscosity, thermal conductivity and/or diffusion coefficient, or causing the medium relaxa­ tion zone to coincide with the frequency of the phonons involved in the SBS process. Two different media can be mixed together in varying proportions to progressively modify the overall medium SBS gain as the input beam intensity is pro­ gressivelsy changed.

    BANDWIDTH-PRESERVING BRILLOUIN PHASE CONJUGATE MIRROR AND METHOD
    6.
    发明公开
    BANDWIDTH-PRESERVING BRILLOUIN PHASE CONJUGATE MIRROR AND METHOD 失效
    与节约带宽和程序布里渊相位共轭镜。

    公开(公告)号：EP0416066A1

    公开(公告)日：1991-03-13

    申请号：EP90904503.0

    申请日：1990-02-22

    Applicant: HUGHES AIRCRAFT COMPANY

    Inventor： ROCKWELL, David, A. ,  LIND, Richard, C. ,  PEPPER, David, M.

    IPC: G02F1 ,  H01S3

    CPC classification number: G02F1/3538 ,  H01S3/305

    Abstract: Un faisceau cohérent d'entrée émis par un laser (82) est introduit dans un mélangeur (8) à quatre ondes amélioré par une zone Brillouin qui génère un faisceau-semence à phases conjuguées qui se propage en sens contraire au faisceau d'entrée. Un amplificateur de Brillouin (86) agencé entre le laser et le mélangeur à quatre ondes transfère l'énergie du faisceau d'entrée (Ep) au faisceau semence (Ec), amplifiant le faisceau-semence de façon à produire un faisceau de sortie à phases conjuguées ayant approximativement 50 % de l'énergie du faisceau d'entrée et une bande passante étroite dépourvue des sauts aléatoires de phase associés au bruit acoustique généralement requis pour initier et maintenir une dispersion stimulée de Brillouin. Le faisceau de sortie à phases conjuguées peut être modulé ou dirigé selon les besoins. On peut dériver des faisceaux de référence pour le mélangeur à quatre ondes à partir de la même source laser que le faisceau d'entrée, avec des énergies inférieures d'un ou plusieurs ordres de magnitude à l'énergie du faisceau d'entrée.

    BANDWIDTH-PRESERVING BRILLOUIN PHASE CONJUGATE MIRROR AND METHOD
    7.
    发明授权
    BANDWIDTH-PRESERVING BRILLOUIN PHASE CONJUGATE MIRROR AND METHOD 失效
    与节约带宽和程序布里渊相位共轭镜。

    公开(公告)号：EP0416066B1

    公开(公告)日：1994-01-26

    申请号：EP90904503.1

    申请日：1990-02-22

    Applicant: Hughes Aircraft Company

    Inventor： ROCKWELL, David, A. ,  LIND, Richard, C. ,  PEPPER, David, M.

    IPC: G02F1/35

    CPC classification number: G02F1/3538 ,  H01S3/305

    Abstract: A coherent input beam from a laser (82) is fed into a Brillouin-enhanced four wave mixer (88) which generates a phase conjugated seed beam in counterpropagation with the input beam. A Brillouin amplifier (86) is provided between the laser and four wave mixer to transfer energy from the input beam (Ep) to the seed beam (Ec) and thereby amplify the seed beam to produce a phase conjugated output beam with approximately 50 % of the energy of the input beam and narrow bandwidth which is free from random phase jumps associated with the acoustic noise generally required to initiate and sustain stimulated Brillouin scattering. The phase conjugated output beam can be modulated or steered in direction, as desired. Reference beams for the four wave mixer may be derived from the same laser source as the input beam and have energies one or more orders of magnitude smaller than the energy of the input beam.

    OPTICAL DEVICE USING STIMULATED BRILLOUIN SCATTERING
    8.
    发明授权
    OPTICAL DEVICE USING STIMULATED BRILLOUIN SCATTERING 失效
    使用刺激式钻石散射的光学装置

    公开(公告)号：EP0339085B1

    公开(公告)日：1993-08-18

    申请号：EP89900692.8

    申请日：1988-09-06

    Applicant: Hughes Aircraft Company

    Inventor： ROCKWELL, David, A. ,  MANGIR, Metin, S. ,  WHITE, Jeffrey, O. ,  JONES, Dennis, C.

    IPC: G02F1/35

    CPC classification number: H01S3/305 ,  G02F1/3538

    Abstract: The output of an optical device which involves a stimulated Brillouin scattering (SBS) gain medium is enhanced over a range of input beam intensities by providing a gain medium which has a given SBS gain for a given input beam intensity, and modifying the gain medium to reduce its SBS gain coefficient. By lowering the SBS gain coefficient, SBS dominance and suppression of stimulated Raman scattering (SRS) can be mitigated, and the output fidelity of a phase conjugation system with respect to its input can be significantly enhanced. Mechanisms for reducing the SBS gain coefficient include increasing the medium viscosity, thermal conductivity and/or diffusion coefficient, or causing the medium relaxation zone to coincide with the frequency of the phonons involved in the SBS process. Two different media can be mixed together in varying proportions to progressively modify the overall medium SBS gain as the input beam intensity is progressively changed.

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