公开(公告)号：US20030123066A1

公开(公告)日：2003-07-03

申请号：US10325178

申请日：2002-12-20

Applicant: Agilent Technologies UK Limited to: Agilent Technologies Inc.

Inventor： Christopher Anthony Park

IPC: G01B009/02

CPC classification number: G01J9/04 ,  H01S5/0687 ,  H04B10/07957 ,  H04B10/572 ,  H04B10/85

Abstract: In an optical communications network employing a wavelength division multiplexing (WDM) system, different wavelengths of electromagnetic radiation are used to transmit different signals. Because the wavelength of electromagnetic radiation that a laser device emits can drift as the temperature of the laser device changes, channels can overlap causing cross-talk. Consequently, the present invention provides a laser wavelength locking control loop apparatus (5) comprising a wavelength selective device (9) and a photodector (11), coupled to a feedback controller circuit (13). Electromagnetic radiation emitted by the laser device (7) is provided to the wavelength selective device (9) which provides a first output signal at a first wavelength and a second output signal at a second wavelength. The first and second output signals are directed to the photodetector (11) so as to coincide when incident thereupon. A beat signal results from the coincidence of the first and second output signals and this is used to measure wavelength drift.

Abstract translation: 在采用波分复用（WDM）系统的光通信网络中，使用不同波长的电磁辐射来传输不同的信号。 由于激光装置发射的电磁辐射的波长随着激光装置的温度变化而漂移，因此通道可能会重叠，导致串扰。 因此，本发明提供了一种激光波长锁定控制环路装置（5），其包括耦合到反馈控制器电路（13）的波长选择装置（9）和光电转换器（11）。 激光装置（7）发射的电磁辐射被提供给提供第一波长的第一输出信号和第二波长的第二输出信号的波长选择装置（9）。 第一和第二输出信号被引导到光电检测器（11），以便当它们入射时一致。 差拍信号是由第一和第二输出信号的一致产生的，这用于测量波长漂移。

公开(公告)号：US06078394A

公开(公告)日：2000-06-20

申请号：US12887

申请日：1998-01-23

Applicant: Nigel R Wood

Inventor： Nigel R Wood

IPC: G01J3/06 ,  G01J9/00 ,  G01J9/02 ,  G01J9/04 ,  H04B10/155 ,  G01B9/02

CPC classification number: G01J9/04 ,  G01J9/02 ,  H04B10/506 ,  H04B10/572 ,  G01J2009/0257

Abstract: Scanning based wavelength measurement systems which are suitable for both localised and distributed WDM, High Density WDM, and coherent systems are based around the use of a fixed cavity Fabry-Perot Etalon which when the output of a tuneable laser is passed through it produces a number of reference equispaced transmission maxima. These maxima are used in a Scanning Heterodyne or Scanning Filter based Spectrometer for detection of the wavelength position of the transmitter.

Abstract translation: 适用于局部和分布式WDM，高密度WDM和相干系统的基于扫描的波长测量系统基于使用固定腔法布里 - 珀罗Etalon，当可调谐激光器的输出通过它时，产生数字 的参考等距传输最大值。 这些最大值用于基于扫描异步或扫描滤波器的光谱仪，用于检测发射机的波长位置。

公开(公告)号：US5896198A

公开(公告)日：1999-04-20

申请号：US967691

申请日：1997-11-12

Applicant: Chien Chou ,  Yeu-Chuen Huang ,  Ching-Mei Feng

Inventor： Chien Chou ,  Yeu-Chuen Huang ,  Ching-Mei Feng

IPC: A61B5/00 ,  G01B9/02 ,  G01J3/433 ,  G01J9/04 ,  G01N21/21

CPC classification number: A61B5/14558 ,  G01B9/02003 ,  G01B9/02007 ,  G01J3/4338 ,  G01J9/04 ,  G01N21/21 ,  G01B2290/70

Abstract: In a method for determining concentration of an optically active substance in a medium, a laser beam with two eigen modes of two different temporal frequencies and two orthogonal linear polarized states is generated and passed through the medium. Then, the laser beam that exits the medium is passed through an analyzing polarizer so as to generate an optical heterodyne of the orthogonal linear polarized states. The amplitude of the optical heterodyne from the analyzing polarizer is detected, and the detected amplitude of the optical heterodyne is converted into the concentration of the optically active substance in the medium. An optical heterodyne-based apparatus for performing the above method is also disclosed. The method and apparatus are suitable for noninvasive in vivo glucose, monitoring of the aqueous humor in an eye of an animal.

Abstract translation: 在确定介质中光学活性物质浓度的方法中，产生具有两个不同时间频率和两个正交线性偏振态的两个本征模的激光束并通过介质。 然后，离开介质的激光束通过分析偏振片，以产生正交线偏振态的光学外差。 检测来自分析偏振器的光学外差的振幅，将检测到的光学外差的振幅转换为介质中光学活性物质的浓度。 还公开了一种用于执行上述方法的基于光学外差的装置。 该方法和装置适用于无创体内葡萄糖，监测动物眼睛中的房水。

公开(公告)号：US5825018A

公开(公告)日：1998-10-20

申请号：US583851

申请日：1996-01-11

Applicant: Charles A. DiMarzio ,  Scott C. Lindberg

Inventor： Charles A. DiMarzio ,  Scott C. Lindberg

IPC: G01J1/42 ,  G01J3/00 ,  G01J9/04 ,  G01S7/48 ,  G01S7/486 ,  H03D9/00

CPC classification number: G01J9/04 ,  G01S7/4914 ,  H03D9/00 ,  G01J2001/4242

Abstract: An optical lock-in detection technique and circuit for coherent applications employing a photo-detector having a symmetric I-V curve is presented. The detection circuit includes a photo-detector operating as an optical lock-in amplifier, and a modulation source. The technique and circuit are used for coherent detection applications such as the determination of the frequency of modulation of an optical signal or the determination of the presence of an optical signal at a specified frequency. The technique and circuit are also used with one or more charge coupled devices in imaging applications.

Abstract translation: 提出了一种使用具有对称I-V曲线的光电检测器的相干应用的光锁定检测技术和电路。 检测电路包括作为光学锁相放大器工作的光检测器和调制源。 技术和电路用于相干检测应用，例如确定光信号的调制频率或确定在特定频率下的光信号的存在。 技术和电路也与成像应用中的一个或多个电荷耦合器件一起使用。

公开(公告)号：US5784161A

公开(公告)日：1998-07-21

申请号：US668263

申请日：1996-06-20

Applicant: Karl-Heinz Bechstein ,  Beate Moeller ,  Klaus Dieter Salewski ,  Andreas Wolfram

Inventor： Karl-Heinz Bechstein ,  Beate Moeller ,  Klaus Dieter Salewski ,  Andreas Wolfram

IPC: G01B9/02 ,  G01J9/04

CPC classification number: G01B9/02004 ,  G01B9/02003 ,  G01B9/02007 ,  G01B9/02027 ,  G01B9/02069 ,  G01J9/04 ,  G01B2290/45 ,  G01B2290/60 ,  G01B2290/70

Abstract: The present invention is directed to a heterodyne interferometer arrangement with tunable laser light sources for absolute distance measurement. The phase angle changes which occur in the synthetic interference signals when varying the laser frequencies are recorded and evaluated. The arrangement also enables error-free distance measurement in the event of a change in the mathematical sign of the phase changes due to frequency jitter.

Abstract translation: 本发明涉及一种具有可调激光源的绝对距离测量的外差干涉仪装置。 记录和评估在改变激光频率时在合成干涉信号中发生的相位角变化。 在由于频率抖动引起的相位变化的数学符号发生变化的情况下，该装置还能够实现无误差距离测量。

公开(公告)号：US5486919A

公开(公告)日：1996-01-23

申请号：US76951

申请日：1993-06-15

Applicant: Toshihiko Tsuji ,  Seiji Takeuchi ,  Kyoichi Miyazaki ,  Minoru Yoshii ,  Noriyuki Nose ,  Tetsuzo Mori

Inventor： Toshihiko Tsuji ,  Seiji Takeuchi ,  Kyoichi Miyazaki ,  Minoru Yoshii ,  Noriyuki Nose ,  Tetsuzo Mori

IPC: G01J9/02 ,  G01J9/04 ,  G01N21/88 ,  G01N21/94 ,  G03F7/20 ,  G01B9/02

CPC classification number: G03F7/70616 ,  G01N21/88 ,  G01N21/94 ,  G03F7/7065 ,  G03F7/70916 ,  G01J2009/0261 ,  G01J9/04 ,  G01N2021/4792 ,  G01N21/8806

Abstract: Disclosed is an inspection method and apparatus: wherein (i) first light having a first state of polarization and a first wavelength, and (ii) second light having a second state of polarization, different from the first state of polarization, and a second wavelength, different from the first wavelength are produced; at least the first light is projected to a position of inspection; and heterodyne interference light produced on the basis of the second light and light scattered at the inspection position and having its state of polarization changed, by the scattering, from the first state of polarization, is detected.

Abstract translation: 公开了一种检查方法和装置：其中（i）具有第一偏振状态和第一波长的第一光，以及（ii）具有与第一偏振态不同的第二极化状态的第二光，以及第二波长 ，与第一波长不同; 至少第一个光被投射到检查的位置; 并且检测基于第二光产生的外差干涉光和在检查位置上散射并且具有从第一极化状态通过散射改变其偏振状态的光。

公开(公告)号：US5233462A

公开(公告)日：1993-08-03

申请号：US875372

申请日：1992-04-29

Applicant: Ngai C. Wong

Inventor： Ngai C. Wong

IPC: G01J9/04 ,  G02F1/39

CPC classification number: G01J9/04 ,  G02F1/39 ,  G02F2203/56

Abstract: One or more optical parametric oscillators are arrayed selectively singly, serially, and/or in parallel, and each oscillator is responsive to an input pump beam having a fractional stability to produce output signal and idler beams having fractional stabilities that correspond to or are better than the fractional stability of the pump beam and in such a way that the sum of the frequencies of the output signal and idler beams of each optical parametric oscillator is constrained to be equal to the frequency of the input beam thereof. One or more beat detectors are responsive to selected one or more signal and idler beams and reference beams of already known frequency and fractional stability to provide one or more beat detection signals having linewiThis invention was made with government support under Contact Number DAAL03-90-G-0128 awarded by the Department of the Army and under Grant Number 60NANBOD1052 awarded by the Department of Commerce. The government has certain rights in the invention.

Abstract translation: 一个或多个光学参数振荡器被选择性地单独，串行和/或并联排列，并且每个振荡器响应于具有分数稳定性的输入泵浦波束以产生输出信号和具有分数稳定性的空载波束，其具有对应于或优于 泵浦光束的分数稳定性并且使得每个光参量振荡器的输出信号和空载波束的频率之和被约束为等于其输入波束的频率。 一个或多个拍频检测器响应于所选择的一个或多个信号和空闲光束以及已知频率和分数稳定性的参考光束，以提供一个或多个拍子检测信号，其具有对应于或优于所选一个或多个信号的线宽的线宽 以及空载波束和参考频率波束，并且使得一个或多个拍子检测信号的频率被限制为等于所选择的一个或多个信号和空载波束与参考频率波束之间的频率差。 总和和差频约束完全确定了几个波束的绝对频率，从而使得能够在选定的不同配置中进行超高分辨率光频率校准和重新校准，宽带超高分辨率频率合成，以及其中包括锁相参考频率输出的宽带频率梳。 在一个并行实施例中，光频率可以相对于微波参考频率进行计数或合成，反之亦然。

公开(公告)号：US4909628A

公开(公告)日：1990-03-20

申请号：US245254

申请日：1988-09-16

Applicant: Shinichiro Aoshima ,  Tamiki Takemori ,  Yutaka Tsuchiya

Inventor： Shinichiro Aoshima ,  Tamiki Takemori ,  Yutaka Tsuchiya

IPC: G01J9/02 ,  G01J9/04 ,  H04B10/516 ,  H04B10/548 ,  H04B10/61

CPC classification number: H04B10/60 ,  G01J9/04 ,  H04B10/64

Abstract: An optical heterodyne detector comprising means for causing two light beams to interfere with each other and producing interference light beams thereof, a streak camera for receiving the interference light beams and analyzing means for analyzing an output of the streak camera, thereby to detect a beat frequency of the two light beams.

公开(公告)号：US4907886A

公开(公告)日：1990-03-13

申请号：US297866

申请日：1989-02-06

Applicant: Rene Dandliker

Inventor： Rene Dandliker

IPC: G01B9/02 ,  G01J9/02 ,  G01J9/04

CPC classification number: G01B9/02007 ,  G01B9/02003 ,  G01B9/02027 ,  G01B9/02067 ,  G01J9/04 ,  G01B2290/70 ,  G01J2009/0207 ,  G01J2009/0253 ,  G01J2009/0261

Abstract: An apparatus for measuring changes in a variable interference section of an interferometer comprises a laser source for producing beams of the frequency n.sub.1 and the frequency n.sub.2, polarizing beam splitters for producing cross-polarized partial beams of frequency n.sub.1 or n.sub.2, modulators for displacing the frequency of one of the partial beams by frequency f.sub.1 or f.sub.2, a pair of deflecting mirrors in each case and polarizing beam splitters for combining the partial beam n.sub.1, n.sub.1 +f.sub.1, n.sub.2, n.sub.2 +f.sub.2. The apparatus further includes two photodetectors, upstream of which are arranged a polarizer, a Michelson interferometer, a non-polarizing beam splitter for splitting the partial beams in each case into a measuring light beam or a reference light beam. The reference light beam passes to an associated photodetector. The measuring light beam passes into the Michelson interferometer and then to the associated photodetector. The signals of the photodetectors are demodulated according to the amplitude and the phase difference between the two demodulated signals is determined. This phase difference is only dependent on the position of a measurement object and the equivalent wavelength of the difference n.sub.1 -n.sub.2. A method for measuring changes by determining positions or distances is performed by the apparatus.

Abstract translation: PCT No.PCT / CH88 / 00070 Sec。 371日期1989年2月6日 102（e）日期1989年2月6日PCT PCT 3月30日PCT公布。 第WO88 / 08519号公报 用于测量干涉仪的可变干涉部分的变化的装置包括用于产生频率n1和频率n2的光束的激光源，用于产生频率为n1的交叉偏振分光束的偏振分束器或 n2，用于通过频率f1或f2移位部分光束中的一个的频率的调制器，每种情况下的一对偏转镜和用于组合部分光束n1，n1 + f1，n2，n2 + f2的偏振光束分离器。 该装置还包括两个光电检测器，其上游设置有偏振器，迈克尔逊干涉仪，用于将每个情况下的部分光束分成测量光束或参考光束的非偏振分束器。 参考光束传递到相关联的光电检测器。 测量光束进入迈克尔逊干涉仪，然后进入相关的光电检测器。 光电探测器的信号根据振幅进行解调，确定两个解调信号之间的相位差。 该相位差仅取决于测量对象的位置和差值n1-n2的等效波长。 通过确定位置或距离来测量变化的方法由该装置执行。

公开(公告)号：US4907885A

公开(公告)日：1990-03-13

申请号：US297527

申请日：1989-01-17

Applicant: Michael A. Globig ,  Michael A. Johnson ,  Richard W. Wyeth

Inventor： Michael A. Globig ,  Michael A. Johnson ,  Richard W. Wyeth

IPC: G01J9/04

CPC classification number: G01J9/04

Abstract: The heterodyne laser diagnostic system includes, in one embodiment, an average power pulsed laser optical spectrum analyzer for determining the average power of the pulsed laser. In another embodiment, the system includes a pulsed laser instantaneous optical frequency measurement for determining the instantaneous optical frequency of the pulsed laser.

Abstract translation: 在一个实施例中，外差激光诊断系统包括用于确定脉冲激光器的平均功率的平均功率脉冲激光光谱分析仪。 在另一个实施例中，系统包括用于确定脉冲激光器的瞬时光频率的脉冲激光瞬时光频率测量。