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18 条记录 (耗时 0.018 秒)

    Raman beam combining for laser brightness enhancement
    2.
    发明授权
    Raman beam combining for laser brightness enhancement 有权
    拉曼光束组合激光亮度增强

    公开(公告)号：US09172208B1

    公开(公告)日：2015-10-27

    申请号：US13771770

    申请日：2013-02-20

    申请人： Lawrence Livermore National Security, LLC

    发明人： Jay W. Dawson ,  Graham S. Allen ,  Paul H. Pax ,  John E. Heebner ,  Arun K. Sridharan ,  Alexander M. Rubenchik ,  Chrisopher B. J. Barty

    IPC分类号： G01C3/08 ,  H01S3/30

    CPC分类号： H01S3/302 ,  H01S3/005 ,  H01S3/0625 ,  H01S3/094042 ,  H01S3/09408 ,  H01S3/2308 ,  H01S3/30

    摘要： An optical source capable of enhanced scaling of pulse energy and brightness utilizes an ensemble of single-aperture fiber lasers as pump sources, with each such fiber laser operating at acceptable pulse energy levels. Beam combining involves stimulated Raman scattering using a Stokes' shifted seed beam, the latter of which is optimized in terms of its temporal and spectral properties. Beams from fiber lasers can thus be combined to attain pulses with peak energies in excess of the fiber laser self-focusing limit of 4 MW while retaining the advantages of a fiber laser system of high average power with good beam quality.

    摘要翻译： 能够增强脉冲能量和亮度的缩放的光源利用单孔光纤激光器的集合作为泵浦源，每个这样的光纤激光器以可接受的脉冲能量级运行。 光束组合涉及使用斯托克斯移位种子束的受激拉曼散射，后者根据其时间和光谱特性进行优化。 光纤激光器的光束可以组合起来，获得超过光纤激光自聚焦极限4兆帕的峰值能量的脉冲，同时保持具有良好光束质量的高平均功率的光纤激光系统的优点。

    THREE PHASE SPECTRAL INTERFEROMETRY
    4.
    发明公开
    THREE PHASE SPECTRAL INTERFEROMETRY 审中-公开

    公开(公告)号：US20240133743A1

    公开(公告)日：2024-04-25

    申请号：US18047120

    申请日：2022-10-17

    申请人： Lawrence Livermore National Security, LLC

    发明人： Ryan Douglas Muir ,  John E. Heebner ,  Daniel Ernest Mittelberger

    IPC分类号： G01J3/45 ,  G01J3/02 ,  G01J3/28

    CPC分类号： G01J3/45 ,  G01J3/0205 ,  G01J3/2823

    摘要： Methods, systems and devices are described that enable measurement and characterization of complex laser pulses by relying on three interferograms that are measured simultaneously. The described three-phase spectral interferometry (3 PSI) can meet the growing demand for optical recorders with long record and 1 ps or finer resolution. An example three-phase interferometric system includes a three-output optical splitter with a first input port to receive the input optical signal, a second input port to receive a reference optical signal with one or more unknown spectral characteristics. The three output ports of the optical splitter produce interferograms that correspond to relative phase shifts of substantially 120 degrees. Detectors are positioned to receive and measure the interferograms, which allows determination of the amplitude and phase of the input optical signal with very high accuracy. The described techniques include may improvements in the alignment, calibration and signal retrieval procedures associated with the 3PSI system.

    High-power electrically tunable switch
    5.
    发明授权
    High-power electrically tunable switch 有权

    公开(公告)号：US11942760B2

    公开(公告)日：2024-03-26

    申请号：US17271428

    申请日：2018-12-19

    申请人： LAWRENCE LIVERMORE NATIONAL SECURITY, LLC

    发明人： Lars F. Voss ,  Adam M. Conway ,  John E. Heebner

    IPC分类号： H01S5/042 ,  H10N70/00

    CPC分类号： H01S5/0428 ,  H10N70/00

    摘要： A high-voltage switch, whose operation leverages the speed of electrons to generate the “on” time of the pulse in combination with the speed of light to generate the “off” time of the pulse, is described. In one example, the high-voltage switch includes a first electrode, a second electrode spaced apart from the first electrode, a region of non-absorbing material occupying a portion of the space between the first and second electrodes and allowing a laser pulse to propagate therethrough without substantial absorption, and a region of absorbing material occupying another portion of the space and producing a charged particle cloud upon receiving the laser pulse. The high-voltage switch remains “on” upon the charged particle cloud reaching an electrode and until it has been collected by the electrode, and where the high-voltage switch remains “off” subsequent to the collection and until another generated charged particle cloud reaches the electrode.

    THREE-PHASE SPECTRAL INTERFEROMETRY WITH IMPROVED SIGNAL RETRIEVAL
    8.
    发明公开
    THREE-PHASE SPECTRAL INTERFEROMETRY WITH IMPROVED SIGNAL RETRIEVAL 审中-公开

    公开(公告)号：US20240159511A1

    公开(公告)日：2024-05-16

    申请号：US18525578

    申请日：2023-11-30

    申请人： Lawrence Livermore National Security, LLC

    发明人： Ryan Douglas Muir ,  John E. Heebner ,  Daniel Ernest Mittelberger

    IPC分类号： G01B9/02 ,  G11B7/0065

    CPC分类号： G01B9/02041 ,  G11B7/0065

    摘要： Methods, systems and devices are described that enable measurement and characterization of complex laser pulses by relying on three interferograms that are measured simultaneously. The described three-phase spectral interferometry (3PSI) can meet the growing demand for optical recorders with long record and 1 ps or finer resolution. These techniques leverage various calibration and signal retrieval operations that allow improved system performance. An example method for determining characteristics of an input optical signal includes measuring the spectra associated with three interferograms produced at outputs of a three-by-three optical splitter, and determining an amplitude and a phase value of the input optical signal using those measurements and the results of a calibration procedure that characterizes point spread functions across multiple spectrometers and determines corrections factors for the spectrometers.

    UV laser based stand-off acoustic sensor
    10.
    发明授权
    UV laser based stand-off acoustic sensor 有权

    公开(公告)号：US10222253B2

    公开(公告)日：2019-03-05

    申请号：US15175423

    申请日：2016-06-07

    申请人： LAWRENCE LIVERMORE NATIONAL SECURITY, LLC

    发明人： Jay W. Dawson ,  Graham S. Allen ,  Michael R. Carter ,  John E. Heebner ,  Michael J. Messerly ,  Paul H. Pax ,  Alexander M. Rubenchik

    IPC分类号： G01D5/58 ,  G01H9/00

    摘要： A system for aerially surveying an area where a plane may have crashed in water and locating pings from the plane's black box using a laser on an aerial platform that produces laser pulses; using a launch telescope to direct the laser pulses to the water producing scattering from the laser pulses and a continuous stream of backscatter; using a receiving telescope to collect the continuous stream of backscatter; using an interferometer operatively connected to the receiving telescope to produce two outputs, wherein one output is the continuous stream of backscatter, and wherein the other output is a delayed replica of the first output; and using a data collection and analysis unit operatively connected to the interferometer to produce a measurement of the sound.