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    Electro-optic devices with acousto-optic effect suppression
    1.
    发明授权
    Electro-optic devices with acousto-optic effect suppression 失效
    具有光学效应抑制的电光设备

    公开(公告)号：US3653743A

    公开(公告)日：1972-04-04

    申请号：US3653743D

    申请日：1970-11-23

    Applicant: HUGHES AIRCRAFT CO

    Inventor： KIEFER JAMES E ,  GOODWIN FRANCIS E

    IPC: G02F1/03 ,  G02F1/26

    CPC classification number: G02F1/0305 ,  G02F2201/505

    Abstract: Acousto-optic resonances in a crystal of a material exhibiting the linear electro-optic effect may be suppressed by coupling to the respective lateral faces of the crystal a plurality of slabs of a material having high acoustic energy absorption properties and an acoustic impedance substantially matching the acoustic impedance of the crystal. Lead, lead glass or titanium are exemplary appropriate acoustic energy absorbing materials for gallium arsenide or cadmium telluride crystals. A layer of either a non-bonding acoustic energy coupling material (such as silicone grease or indium), or a coupling and bonding material (such as shellac) is disposed between each absorbing slab and the adjacent crystal face.

    Abstract translation: 表现出线性电光效应的材料的晶体中的声光谐振可以通过将具有高声能吸收特性的材料的多个平板耦合到晶体的各个侧面，并且基本匹配于 晶体的声阻抗。 铅，铅玻璃或钛是用于砷化镓或碲化镉晶体的示例性合适的声能吸收材料。 在每个吸收板和相邻的晶面之间设置有非粘结声能耦合材料（例如硅脂或铟）或耦合和接合材料（如虫胶）的层。

    Tuned stable laser in a communication system
    3.
    发明授权
    Tuned stable laser in a communication system 失效
    在通信系统中调整稳定的激光

    公开(公告)号：US3482099A

    公开(公告)日：1969-12-02

    申请号：US3482099D

    申请日：1965-08-16

    Applicant: HUGHES AIRCRAFT CO

    Inventor： GOODWIN FRANCIS E

    IPC: G02F2/00 ,  H01S3/13 ,  H04B10/00 ,  H04B10/148 ,  H04B9/00

    CPC classification number: H04B10/60 ,  G02F2/002 ,  H01S3/13 ,  H04B10/64

    Abstract: 1,136,635. Lasers. HUGHES AIRCRAFT CO. 16 May, 1966 [16 Aug., 1965], No. 21551/66. Heading H1C. [Also in Division G1] In a laser communication system receiver in which the information carrying beam is heterodyned with a laser local oscillator beam the frequency of the laser local oscillator is adjusted to compensate for doppler shift on the information carrying beam. In a space communication system, the beam from a fixed frequency f 0 laser 98, Fig. 4, on a spacecraft 90 is modulated by information from a source 93 and beamed to a ground station 100 where it is mixed with the beam from a tunable laser 108. The output of mixer 102 should be at a frequency f if , but is modified by the doppler shift f d . Feedback is provided from the I.F. stage of the receiver to keep the frequency of laser 108 equal to f o +f d + if f so that the output of mixer 102 is truly f if . Laser 108 simultaneously produces a beam 105 of frequency f o -f d -f if which is used to transmit information to the spacecraft where it arrives doppler shifted to f o -f if ready for mixing with the beam from laser 98. Laser frequency control system.-The tunable laser comprises a tube 42, Fig. 2, containing ionized gas surrounded by a coil 60. Coil 60 is energized by signal from the I.F. stage indicating deviation from the desired f if and varies the amount of Zeeman splitting to compensate. The output beam 65, the components of which are circularly polarized in opposite directions is converted to orthogonally plane polarized beams by a quarter-wave plate and split by a Wollaston prism. Part of the beam applied to the mixer is selected by a mirror 82 and applied to a circuit 52 which maximizes the amplitude of the oscillation by energizing a piezo-electric transducer 50 carrying one of the mirrors 48 which defines the resonant cavity of the laser. In a modification, Fig. 5 (not shown), in which the resonant cavity has different apparent length for the components f o +f d +f ij and f o -f d -f if , mirror 48 is fixed and a beam polarizing and splitting assembly similar to 70 is provided at the other end of the tube 42. The beams produced are directed on to mirrors (146), (147) on opposite sides of a piezo-electric transducer energizable to increase one path and decrease the other path simultaneously.

    Frequency stabilized laser
    5.
    发明授权
    Frequency stabilized laser 失效

    公开(公告)号：US3588738A

    公开(公告)日：1971-06-28

    申请号：US3588738D

    申请日：1968-09-03

    Applicant: HUGHES AIRCRAFT CO

    Inventor： GOODWIN FRANCIS E

    IPC: H01S3/139 ,  H01S3/02

    CPC classification number: H01S3/1396

    Abstract: THE INVENTION IS A FREQUENCY STABILIZED LASER IN WHICH AN ACTIVE LASER ELEMENT AND A BIREFRINGENT PLATE ARE DISPOSED WITHIN A REGENERATIVE CAVITY IN A REGENERATIVE PATH DEFINED BETWEEN TWO END REFLECTORS TO PRODUCE A DUAL POLARIZED OUTPUT BEAM. THE ACTIVE LASER ELEMENT IS EXCITED BY PLUMP ENERGY AND A PORTION OF THE LASER OUTPUT BEAM IS DIVERTED BY A BEAM SPLITTER TO A WOLLASTON PRISM WHERE IT IS SEPARATED AC-

    CORDING TO POLARIZATION INTO TWO BEAMS. EACH OF THESE BEAMS IS DIRECTED TO AN OPTICAL DETECTOR WHICH DETECTS THE AMPLITUDE OF THE INCIDENT BEAM AT ITS OWN PARTICULAR FREQUENCY OF OSCILLATION. THE AMPLITUDES OF THE TWO BEAMS ARE COMPARED BY A COMPARATOR THAT PRODUCES AN ERROR SIGNAL WHICH DRIVES A FREQUENCY ADJUSTMENT ELEMENT COUPLED TO THE LASER.

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