公开(公告)号：US6141138A

公开(公告)日：2000-10-31

申请号：US160910

申请日：1998-09-25

申请人： Susumu Machida ,  Shudong Jiang ,  Jun Chen ,  Yoshihisa Yamamoto

发明人： Susumu Machida ,  Shudong Jiang ,  Jun Chen ,  Yoshihisa Yamamoto

IPC分类号： G01B9/02 ,  G01J9/00 ,  G02F1/01

CPC分类号： G01B9/02024 ,  G01B9/02007 ,  G01J9/00

摘要： An optical phase characteristic measuring apparatus includes a harmonic generator for generating a harmonic wave from a fundamental wave of output light from a light source; a beam splitter for splitting a fundamental-wave component of the output light and a harmonic component; a sample disposed in one of optical paths along which light beams from the beam splitter propagate; a unit that is composed of a signal generator and a mirror and is adapted to modulate the length of one of the optical paths; an optical mixer for mixing the light beams containing the fundamental-wave component and the harmonic component; an optical separator for separating light output from the optical mixer into a fundamental-wave component and a harmonic component; a first optical detector for detecting a fundamental-wave component of an output from the optical separator; a second optical detector for detecting a harmonic component of the output from the optical separator; and a phase detector for detecting the phase difference between AC signals output from the two optical detectors. An optical amplitude/phase characteristic measuring apparatus has a similar structure but includes two light sources, a sum-frequency generator, and other related circuits.

摘要翻译： 光学相位特性测量装置包括：谐波发生器，用于从来自光源的输出光的基波产生谐波; 用于分离输出光的基波分量和谐波分量的分束器; 设置在沿着光束分离器传播光束的光路中的一个样本; 由信号发生器和反射镜组成的单元，适于调制光路之一的长度; 用于混合包含基波分量的光束和谐波分量的光学混合器; 用于将从所述光学混合器输出的光分离成基波分量和谐波分量的光学分离器; 用于检测来自光学分离器的输出的基波分量的第一光学检测器; 第二光学检测器，用于检测来自光学分离器的输出的谐波分量; 以及用于检测从两个光学检测器输出的AC信号之间的相位差的相位检测器。 光学振幅/相位特性测量装置具有类似的结构，但包括两个光源，和频发生器和其它相关电路。

公开(公告)号：US6057919A

公开(公告)日：2000-05-02

申请号：US893647

申请日：1997-07-11

申请人： Susumu Machida ,  Shudong Jiang ,  Yoshihisa Yamamoto

发明人： Susumu Machida ,  Shudong Jiang ,  Yoshihisa Yamamoto

IPC分类号： G01J11/00 ,  G04F13/02 ,  G01B9/02

CPC分类号： G04F13/026 ,  G01J11/00

摘要： In an optical pulse characteristic measuring apparatus, optical pulses to be measured are introduced at the incident end, and split at an beam splitter. A first resultant light beam is reflected by a mirror as a local oscillation light of homodyne detection and is adjusted in a delay element so as to have the same optical path length as that of the second resultant light beam. Subsequently, the first light beam is led to an optical mixer. The second light beam is reflected by a mirror, which is controlled by a signal from a signal generator for modulation of optical path length difference. The second light beam is then reflected by a delay element and is led to the optical mixer. The two light beams combined at the optical mixer are detected by optical detectors. The AC signal component generated by modulation of the optical path length difference is amplified up to a measurable voltage by a differential amplifier. A bandpass filter passes only the AC signal component generated by modulation of the optical path length difference, thereby improving the S-N ratio. By using an AC voltmeter to measure the AC signal component corresponding to the delay of the delay element for correlation length measurement, the auto-correlation signal can be obtained. Accordingly, it is possible to measure the characteristics of optical pulses with high sensitivity and high stability.

摘要翻译： 在光脉冲特性测量装置中，在入射端引入要测量的光脉冲，并在分束器处分开。 第一合成光束被反射镜作为零差检测的局部振荡光反射，并且在延迟元件中被调整为具有与第二合成光束相同的光程长度。 随后，将第一光束引导到光学混合器。 第二光束被反射镜反射，该反射镜由来自信号发生器的信号控制，用于调制光程长度差。 第二光束然后被延迟元件反射并被引导到光学混合器。 在光学混合器处组合的两个光束由光学检测器检测。 通过调制光程长度差产生的交流信号分量被差分放大器放大到可测量的电压。 带通滤波器仅通过由光程长度差的调制产生的AC信号分量，从而提高S-N比。 通过使用交流电压表来测量与相关长度测量的延迟元件的延迟对应的交流信号分量，可以获得自相关信号。 因此，可以测量具有高灵敏度和高稳定性的光脉冲的特性。