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    43.
    发明专利
    未知

    公开(公告)号：DE3884489T2

    公开(公告)日：1994-01-27

    申请号：DE3884489

    申请日：1988-07-12

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： AOSHIMA SHINICHIRO ,  TSUCHIYA YUTAKA ,  NAKAMURA TAKUYA

    IPC: G01R1/07 ,  G01R15/24 ,  G01R19/00 ,  G01R31/302 ,  H01L21/66 ,  G01R1/067 ,  G01R15/07 ,  G01R31/28

    Abstract: In a voltage detector using an electro-optic material whose refractive index is changed by a voltage developing in a gelected area of an object under test, a light beam emitted from a light source is applied to a beam splitter, where it is split into a light beam advancing along a reference optical path and a light beam advancing along an optical path extended to an optical path length changing means made of the electro-optic material, and the light beams are returned from the reference optical path and the optical path length changing means after reflection to the beam splitter, where they are caused to interference with each other to provide an output light beam which is applied to a detector. The efficiency of light beam utilization is improved, and the voltage developing in the selected area of the object can be detected with high accuracy.

    47.
    发明专利
    未知

    公开(公告)号：DE3873422D1

    公开(公告)日：1992-09-10

    申请号：DE3873422

    申请日：1988-05-31

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： AOSHIMA SHINICHIRO ,  TSUCHIYA YUTAKA ,  TAKAHASHI HIRONORI

    IPC: G01R1/07 ,  G01R15/24 ,  G01R19/00 ,  G01R15/07 ,  G01R31/28

    Abstract: A voltage detector detects a voltage developing in a selected area of an object such as an integrated circuit by utilizing an electro-optic material equipped in an optical probe. A change in refractive index of the first electro-optic material which is caused by the voltage in the object, is detected as a change of polarization of a light beam passing through the first electro-optic material. In order to compensating for a polarization change caused by the spontaneous birefringence, the first and second electro-optic materials made of the same material are disposed in such a manner that the first and second electro-optic materials and aligned along a light-traveling direction with their lengths in the light-traveling direction being substantially identical and with their optic axes being perpendicular to each other.

    Mode-locked solid-state laser
    48.
    发明专利
    Mode-locked solid-state laser 未知

    公开(公告)号：GB2230895A

    公开(公告)日：1990-10-31

    申请号：GB9007775

    申请日：1990-04-05

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： AOSHIMA SHINICHIRO ,  FUKUMITSU KENSHI

    IPC: H01S3/06 ,  H01S3/083 ,  H01S3/098 ,  H01S3/106 ,  H01S3/109

    Abstract: A solid-state lasing medium comprises a mode locking section 10A and a transducer 12 supplied with a high-frequency voltage to generate an ultrasonic wave to propagate through the mode locking section. Whereby the emitted laser light pulses have a repetition through frequency determined by the frequency of the ultrasonic wave. Alternative embodiments are detailed (Figs 2 to 8), comprising ring lasers, second harmonic generators (22, 40, 46), and prismatic laser media (24, 28, 38, 42).

    Voltage measuring apparatus
    49.
    发明专利
    Voltage measuring apparatus 未知

    公开(公告)号：GB2223573A

    公开(公告)日：1990-04-11

    申请号：GB8918374

    申请日：1989-08-11

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： TAKAHASHI HIRONORI ,  AOSHIMA SHINICHIRO ,  TSUCHIYA YUTAKA

    IPC: G01R19/00 ,  G01R1/07 ,  G01R15/24 ,  G02F1/03

    Abstract: A voltage measuring apparatus comprises an optical probe furnished with an electro-optic material whose refractive index is changed in accordance with a voltage developing in a given part of an object and an auxiliary electrode for terminating electric lines of force coming from the given part, a light source for producing light to be inputted to the electro-optic material, a light polarization detector for detecting a polarization state of output light from the electro-optic material, and a power source for applying a variable voltage to the auxiliary electrode. An absolute value of the voltage in the given part can be determined as a specific value of the variable voltage obtained when no change is detected in the polarization state of the output light.

    A COLLIDING PULSE MODE-LOCKED PULSE LASER
    50.
    发明专利
    A COLLIDING PULSE MODE-LOCKED PULSE LASER 未知

    公开(公告)号：GB2187882B

    公开(公告)日：1989-11-01

    申请号：GB8701697

    申请日：1987-01-27

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： AOSHIMA SHINICHIRO

    IPC: H01S3/083 ,  H01S3/081 ,  H01S3/09 ,  H01S3/094 ,  H01S3/098

    Abstract: A CPM pulse laser device is provided which has a means for emitting pulses in two separate directions. A return system is provided for returning one of the pulses to the laser resonator in such a manner that the returned pulse is superposed on the other pulse which was propagated in the other direction. The return system preferably includes a total reflecting mirror or a nonlinear crystal. The position of the total reflecting mirror or nonlinear crystal is precisely adjusted to create the superposition.

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