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    THERMALLY ACTUATED ADAPTIVE OPTICS
    1.
    发明申请
    THERMALLY ACTUATED ADAPTIVE OPTICS 有权

    公开(公告)号：US20220413259A1

    公开(公告)日：2022-12-29

    申请号：US17360726

    申请日：2021-06-28

    申请人： Coherent, Inc.

    发明人： Michael HERTWIG ,  Keith M. MURDOCH

    IPC分类号： G02B7/18 ,  G02B7/182

    摘要： A thermally actuated adaptive optic includes a base, a reflector, and a plurality of actuators coupled therebetween. The reflector has a light-receiving front surface, and a back surface facing the base. Each actuator includes a bracket rigidly bonded to the reflector at a perimeter of the reflector, and an inner rod and an outer rod. Each rod is rigidly connected between the bracket and the base, with the inner rod being closer to a center of the reflector. The length of each rod is temperature dependent. In another adaptive optic, the rods are instead bonded directly to the reflector. This adaptive optic may be modified to implement an integrally formed, thermally actuated support. The disclosed adaptive optics are suitable for use in laser systems, allow for significant cost savings over piezoelectric devices, provide a reflective area free of surface-figure perturbations caused by the actuator-interfaces, and are relatively simple to manufacture.

    SPECTRALLY BROADENING ULTRASHORT-PULSE COMPRESSOR
    2.
    发明申请
    SPECTRALLY BROADENING ULTRASHORT-PULSE COMPRESSOR 有权

    公开(公告)号：US20220219259A1

    公开(公告)日：2022-07-14

    申请号：US17148521

    申请日：2021-01-13

    申请人： Coherent, Inc.

    发明人： Nick HARTMANN ,  Michael HERTWIG

    IPC分类号： B23K26/0622 ,  B23K26/06 ,  B23K26/046

    摘要： An ultrashort-pulse compressor includes (a) one or more bulk-optics intersecting a propagation path of an ultrashort-pulsed laser beam multiple times to spectrally broaden a pulse of the laser beam during each of multiple passes through the bulk-optic(s), (b) one or more dispersive optics for compressing a duration of the pulse after each of the multiple passes, and (c) a plurality of focusing elements for focusing the laser beam between the multiple passes. Propagation distances between the bulk-optic(s) and the focusing elements are detuned from imaging such that a spot size of the laser beam, at the bulk-optic(s), is greater at each successive one of the multiple passes. As the laser beam propagates through this compressor, each laser pulse is alternatingly spectral broadened and temporally compressed. The increasing spot size of the laser, for each pass, helps prevent optical damage, run-away self-focusing, and other undesirable outcomes.

    LASER WELDING METHOD
    3.
    发明申请
    LASER WELDING METHOD 有权

    公开(公告)号：US20210362271A1

    公开(公告)日：2021-11-25

    申请号：US16881886

    申请日：2020-05-22

    申请人： Coherent, Inc.

    发明人： Ryan BRESCOE

    IPC分类号： B23K26/244 ,  B23K26/073 ,  B23K26/06 ,  B23K26/0622

    摘要： A method for laser keyhole welding is disclosed to weld two pieces together made of a metal alloy. The method independently adjusts power in a focused center beam and power in a concentric focused annular beam. At the termination of a weld, the power of the annular beam is reduced, motion of the focused beams is stopped, the power of the center beam is increased, and the power of both beams is initially ramped down rapidly and then ramped down slowly. Increasing the power of the center beam equalizes the temperature of both pieces prior to solidification and cooling at the termination of the weld. An additional pulse of power may be applied to prevent the formation of defects or to erase any defects.

    Laser material processing distance gauge
    4.
    发明授权
    Laser material processing distance gauge 有权

    公开(公告)号：US11014194B2

    公开(公告)日：2021-05-25

    申请号：US15801674

    申请日：2017-11-02

    申请人： Coherent, Inc.

    发明人： Keith Jefferies

    IPC分类号： B23K26/04 ,  G01B7/14 ,  B23K26/38

    摘要： Apparatus for distance gauging in laser material processing includes a source of laser-radiation, an electrically-conductive focusing assembly, a constant-current source, and a voltmeter. The focusing assembly focuses laser-radiation towards an electrically conductive workpiece being processed. The focusing assembly and the workpiece form a capacitive sensor. The constant current source provides a constant electrical current to the focusing assembly for a constant time. The focusing assembly and the workpiece are separated by a distance that is proportional to a change in voltage measured on the focusing assembly during the constant time.

    LASER WELDING METHOD
    5.
    发明申请
    LASER WELDING METHOD 审中-公开

    公开(公告)号：US20200254562A1

    公开(公告)日：2020-08-13

    申请号：US16786623

    申请日：2020-02-10

    申请人： Coherent, Inc.

    发明人： Ryan BRESCOE ,  Jean-Philippe LAVOIE

    IPC分类号： B23K26/06 ,  B23K26/073 ,  B23K26/70 ,  B23K26/082 ,  B23K26/22

    摘要： A method for laser keyhole welding of metal alloys is disclosed. The method independently adjusts power in a focused center beam and power in a concentric focused annular beam. At the termination of a weld, the power in the center beam is initially ramped up and then ramped down, while the power in the annular beam is ramped down. Increasing the power in the center beam enables a controlled and prolonged contraction of the keyhole and melt pool, thereby preventing undesirable cracking.

    Aberration compensated diode-laser stack
    6.
    发明授权
    Aberration compensated diode-laser stack 有权

    公开(公告)号：US10539805B2

    公开(公告)日：2020-01-21

    申请号：US15414906

    申请日：2017-01-25

    申请人： Coherent, Inc.

    发明人： Athanasios Chryssis ,  Geunmin Ryu ,  David Schleuning

    IPC分类号： G02B27/12 ,  H01S5/00 ,  H01S5/40

    摘要： Optical output beams from a vertical stack of diode-laser bars are focused by a simple focusing lens on an optical axis of the lens. The optical output beams from outlying diode-laser bars in the vertical stack are tilted with respect to the optical axis of the focusing lens such that optical output from the whole vertical stack is brought to a common focus location on the optical axis of the focusing lens.