Beam position and width sensing by scattering
    2.
    发明授权
    Beam position and width sensing by scattering 失效
    光束位置和散射的宽度感测

    公开(公告)号:US3619066A

    公开(公告)日:1971-11-09

    申请号:US3619066D

    申请日:1969-03-07

    CPC classification number: G01J1/4257 H01P3/20

    Abstract: Beam position and beam width sensing is accomplished by scattering a small percentage (0.1 percent) of the beam energy. The scattered light is analyzed by an arrangement of three photosensors that compare the energy distribution along different portions of the beam and produce appropriate error signals which are then used to reposition and focus the beam. Scattering is accomplished by means of thin threads disposed across the wavepath.

    Multiple beam transmission system
    8.
    发明授权
    Multiple beam transmission system 失效
    多光束传输系统

    公开(公告)号:US3574439A

    公开(公告)日:1971-04-13

    申请号:US3574439D

    申请日:1968-09-24

    CPC classification number: H04B10/2581 G02B6/10

    Abstract: Special multiplexing of a plurality of N beams in a beam transmission system comprising a sequence of confocally spaced lenses is accomplished by directing the beams such that p separate groups of q beams are formed at odd lenses in said sequence of lenses, and q separate groups of p beams are formed at even lenses in said sequence, where p and q are integers greater than one and p X q N. The beams are resolved at the output end into N separate beams. A similar arrangement can be employed using nonconfocally spaced lenses or a continuously focusing waveguide.

    Laser oscillator with mode selector
    9.
    发明授权
    Laser oscillator with mode selector 失效
    具有模式选择器的激光振荡器

    公开(公告)号:US3573656A

    公开(公告)日:1971-04-06

    申请号:US3573656D

    申请日:1968-12-23

    CPC classification number: H01S3/0805 H01S3/082 H01S3/086

    Abstract: Unwanted longitudinal modes, typically generated by a laser oscillator, are suppressed by replacing one of the two uniformly reflecting cavity mirrors with a pair of longitudinally spaced apertured mirrors. Between themselves, the apertured mirrors form an auxiliary cavity supportive of a set of longitudinal modes that are different than the set supported by the primary cavity. As a result, the laser can only oscillate at those frequencies common to both resonant cavities. The mode selectivity is made continuously variable by providing means for changing the relative size of the beam and the apertures in the auxiliary cavity mirrors.

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