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    Optical feedback eliminator
    54.
    发明授权
    Optical feedback eliminator 失效
    光反馈消除器

    公开(公告)号：US5452313A

    公开(公告)日：1995-09-19

    申请号：US210481

    申请日：1994-03-21

    Applicant: David Fink

    Inventor： David Fink

    IPC: G02F2/02 ,  G02F1/11 ,  H01S3/00 ,  H01S3/10 ,  H01S3/101 ,  H01S3/223 ,  H01S3/23

    CPC classification number: H01S3/0064 ,  G02F1/11 ,  H01S3/2232 ,  H01S3/2308

    Abstract: Deleterious feedback reflections from a power amplifier into a laser master oscillator are eliminated by interposing a nonreciprocal frequency shifter between the oscillator and amplifier, which shifts the laser frequency by more than twice the bandwidth of the laser oscillator resonant cavity.

    Abstract translation: 通过在振荡器和放大器之间插入不可逆移频器来消除功率放大器对激光主振荡器的有误反馈反射，将激光频率偏移超过激光振荡器谐振腔带宽的两倍。

    Method of obtaining a narrow field of view scan
    55.
    发明授权
    Method of obtaining a narrow field of view scan 失效
    获得窄视场扫描的方法

    公开(公告)号：US5387996A

    公开(公告)日：1995-02-07

    申请号：US915226

    申请日：1992-07-20

    Applicant: Mario P. Palombo ,  David Fink

    Inventor： Mario P. Palombo ,  David Fink

    IPC: G02B26/10 ,  G02B26/12 ,  G02B26/08

    CPC classification number: G02B26/129

    Abstract: Disclosed is a scanning device (10) having a very fast raster scan and a small angle field of view. The scanning device (10) incorporates a rotating polygon scanning wheel (12) in which a beam of light (24) is reflected off of a first facet (14') of the wheel (12). A reflected beam (32) from the first facet (14') is directed through an optical subsystem that reverses the scanning direction of the beam and redirects the beam onto a second facet (14") of the scanning wheel (12). Since the subsystem optics reverses the scan of the beam, the second facet (14") scans the beam in an opposite direction to that of the first facet (14') and only the difference between the two scans remains. In a first embodiment, the optical subsystem magnifies or demagnifies the beam such that the angle of scan is enlarged or reduced, and thus the second scan will not completely cancel the first scan. Consequently, a very narrow field of view of a particular scene can be scanned very quickly. In an alternate embodiment, the size of the scan is altered by either altering the convergence or divergence of the beam between the two scanning reflections to achieve the small angle scan. In yet another embodiment, the small angle scan is achieved by substantially, but not entirely, reversing the scan direction.

    Abstract translation: 披露了具有非常快的光栅扫描和小角度视场的扫描装置（10）。 扫描装置（10）包括旋转多边形扫描轮（12），其中光束（24）从轮（12）的第一刻面（14'）反射。 来自第一小面（14'）的反射光束（32）被引导通过光学子系统，其反转光束的扫描方向并将光束重定向到扫描轮（12）的第二刻面（14“）上。 由于子系统光学器件反转光束的扫描，所以第二刻面（14“）以与第一刻面（14'）的扫描方向相反的方向扫描光束，并且仅保留两次扫描之间的差异。 在第一实施例中，光学子系统放大或缩小光束，使得扫描角度被放大或缩小，因此第二次扫描将不会完全取消第一次扫描。 因此，可以非常快速地扫描特定场景的非常狭窄的视野。 在替代实施例中，通过改变两个扫描反射之间的光束的会聚或发散来实现小角度扫描来改变扫描的大小。 在另一个实施例中，通过基本上但不完全地反转扫描方向来实现小角度扫描。

    Cavity modulated linear chirp laser
    56.
    发明授权
    Cavity modulated linear chirp laser 失效
    腔调制线性啁啾激光器

    公开(公告)号：US5289493A

    公开(公告)日：1994-02-22

    申请号：US871887

    申请日：1992-04-21

    Applicant: David Fink

    Inventor： David Fink

    IPC: H01S3/08 ,  H01S3/081 ,  H01S3/083 ,  H01S3/106

    CPC classification number: H01S3/106 ,  H01S2301/08 ,  H01S3/08059 ,  H01S3/0811 ,  H01S3/083 ,  H01S3/105

    Abstract: A laser configuration is disclosed that generates linear, repeatable, and one-directional frequency modulated chirps by means of a laser cavity whose effective length is varied by employing a combination of a moving special optical element that engages the laser beam twice on each pass of the laser beam through the cavity plus other optical elements such that the laser beam is returned back upon itself, thus rendering ineffective certain errors of position or orientation associated with the motion of the special optical element that otherwise would disturb the established optical alignment of the laser cavity. Equivalent results are obtained with a ring laser by applying similar and corresponding optical features.

    Abstract translation: 公开了一种激光器配置，其通过激光腔产生线性，可重复和单向的频率调制啁啾，激光腔的有效长度通过采用移动的特殊光学元件的组合而变化，所述移动专用光学元件在每次通过 激光束通过腔体加上其他光学元件，使得激光束自身返回，因此使得与特殊光学元件的运动相关联的位置或取向的某些误差无效，否则将干扰激光腔的建立的光学对准 。 通过应用类似和相应的光学特征，通过环形激光器获得等效结果。

    High resolution spectral line selector
    57.
    发明授权
    High resolution spectral line selector 失效
    高分辨率光谱线选择器

    公开(公告)号：US5287368A

    公开(公告)日：1994-02-15

    申请号：US871878

    申请日：1992-04-21

    Applicant: David Fink

    Inventor： David Fink

    IPC: H01S3/03 ,  H01S3/08 ,  H01S3/13

    CPC classification number: H01S3/08009 ,  H01S3/0315

    Abstract: A spectral line selector for a laser comprises a diffraction grating that images a waveguide exit plane back into the waveguide with an essentially exact reproduction of the waveguide output intensity and phase distribution and with a predetermined wavelength. The selector also comprises lenses disposed between the waveguide exit at a point between the exit opening and the grating, the lenses providing a magnification and a phase compensation to the beam passing therethrough such that the phase of the beam returned to the waveguide matches that of the exiting beam. Thus, coupling losses due to clipping of the returned beam at the entrance to the waveguide bore and coupling losses due to a mismatch of the returning field phase to that of the waveguide mode are made essentially zero.

    Abstract translation: 用于激光器的谱线选择器包括衍射光栅，其以波导输出强度和相位分布的基本上准确的再现并且具有预定波长将波导出口平面成像回到波导中。 选择器还包括设置在出口和光栅之间的一个点处的波导出口之间的透镜，透镜为通过其中的光束提供放大倍率和相位补偿，使得返回到波导的光束的相位与 退出梁。 因此，由于返回的波束在波导孔的入口处的削波导致的耦合损耗以及由于返回的场相位与波导模式的失配而导致的耦合损耗基本为零。

    Phase plate or spiral phase wheel driven linear frequency chirped laser
    58.
    发明授权
    Phase plate or spiral phase wheel driven linear frequency chirped laser 失效
    相位板或螺旋相轮驱动线性啁啾激光器

    公开(公告)号：US5283796A

    公开(公告)日：1994-02-01

    申请号：US871888

    申请日：1992-04-21

    Applicant: David Fink

    Inventor： David Fink

    IPC: H01S3/105 ,  H01S3/106 ,  H01S3/13

    CPC classification number: H01S3/106 ,  H01S3/105 ,  H01S2301/08 ,  H01S3/08068 ,  H01S3/2232

    Abstract: Frequency modulated radar transmitters with a repetitive linear increase in frequency with time, referred to as "frequency chirps", are required for many radar applications. The present invention provides a simple way of obtaining such a chirped frequency modulation for a laser radar transmitter or the like. The principle is to translate an optical wedge in the direction of its wedge gradient at constant velocity across the optical path of a laser resonator. The resulting increase or decrease in the effective optical length of the resonator causes frequency chips. In a first embodiment of the present invention, a rotating phase plate on the face of a rotating wheel with the added phase varying linearly with angular position around the wheel is placed within a laser's resonator cavity to tune the optical pathlength of the cavity and thereby the longitudinal mode of the resonator to produce the chirp. This embodiment can be used in either a reflective or a transmissive mode. In a second embodiment of the present invention, the outer peripheral rim of a spiral wheel having a spirally increasing or decreasing radius is used, whereby the rim functions as a mirror, is disposed within the laser resonator. Rotating the wheel changes the optical pathlength of the resonator and causes the longitudinal modes of the resonator to tune so as to generate the required chirp sequence. Lastly, various systems are proposed for eliminating various types of errors in the system as well as for generating both up-chirps and down-chirps sequentially and/or simultaneously.

    Abstract translation: 对于许多雷达应用，需要频率随时间的重复线性增加的调频雷达发射机（被称为“频率啁啾”）。 本发明提供了一种获得激光雷达发射机等的这种啁啾频率调制的简单方法。 其原理是在激光谐振器的光路上以恒定的速度沿其楔形梯度的方向平移光楔。 谐振器的有效光学长度的增加或减少导致频率芯片。 在本发明的第一实施例中，在旋转轮的表面上的旋转相位板被放置在激光器的谐振腔内，以调节空腔的光程长度 谐振器的纵向模式以产生啁啾声。 该实施例可以以反射或透射模式使用。 在本发明的第二实施例中，使用具有螺旋增加或减小半径的螺旋轮的外周边缘，由此轮缘用作反射镜，设置在激光谐振器内。 轮的转动改变了谐振器的光路长度，并使谐振器的纵向模式进行调谐，以产生所需的啁啾序列。 最后，提出了用于消除系统中的各种类型的错误以及顺序地和/或同时地产生上行链路和下行链路的各种系统。

    Optical path length multiplication system
    59.
    发明授权
    Optical path length multiplication system 失效
    光路长度乘法系统

    公开(公告)号：US5146368A

    公开(公告)日：1992-09-08

    申请号：US696379

    申请日：1991-05-06

    Applicant: David Fink

    Inventor： David Fink

    IPC: G02B6/28 ,  G02B17/02 ,  G02B23/00 ,  G02B26/06

    CPC classification number: G02B26/06 ,  G02B17/02 ,  G02B23/00 ,  G02B6/2861

    Abstract: This disclosure describes an optical system which serves to multiply the change in the path length of an optical system. The system employs an even number of pairs of mirrors which are displaceable along a line or lines parallel to an axis. Each segment of the optical path is between mirrors which are oppositely displaceable, so that the length of each segment is increased by an amount equal to twice the displacement of the mirror pairs.

    Abstract translation: 本公开描述了一种用于乘以光学系统的路径长度的变化的光学系统。 该系统采用偶数对的反射镜，其可以沿着平行于轴的线或线移位。 光路的每个段在相反位移的反射镜之间，使得每个段的长度增加等于镜对的位移的两倍的量。

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