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    1.
    发明专利
    未知

    公开(公告)号：DE69721888T2

    公开(公告)日：2004-05-13

    申请号：DE69721888

    申请日：1997-03-25

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： AOSHIMA SHINICHIRO ,  ITO HARUYASU ,  TSUCHIYA YUTAKA

    IPC: H01S3/131 ,  H01S3/08 ,  H01S3/081 ,  H01S3/098 ,  H01S3/16

    Abstract: An ultrashort pulse laser apparatus of the this invention includes (1) a laser medium, (2) a laser resonator which stores the laser medium and externally extracts a laser beam, and (3) an excitation source for outputting an excitation energy to the laser resonator to excite the laser medium. The laser resonator includes (i) a plurality of resonant mirrors disposed on both sides of the laser medium to form a resonant optical path, and (ii) a phase dispersion compensation unit which includes two optical members respectively arranged on two light input/output surface sides of the laser medium on the resonant optical path and compensates phase dispersion of light in the resonant optical path. That is, the laser medium is disposed in the optical path between the two optical members of the phase dispersion compensation unit. With this arrangement, even when the laser medium is arranged almost at the center of the laser resonator to stabilize mode locking, the cavity length of the resonant optical path can be reduced. Therefore, the repetition frequency of laser pulses can be increased, and simultaneously, size reduction of the laser apparatus itself can be achieved.

    2.
    发明专利
    未知

    公开(公告)号：DE69719829D1

    公开(公告)日：2003-04-24

    申请号：DE69719829

    申请日：1997-01-08

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： TAKAHASHI HIRONORI ,  AOSHIMA SHINICHIRO

    IPC: G02B26/04 ,  G02B27/10

    Abstract: An optical delay apparatus that regularly alternately outputs beams having mutually different delays on one optical axis and that can variably set a delay amount of at least one beam. A motor 112 rotation-drives a rotating plate 111 in which reflective portions and transmissive portions are formed regularly alternately in the circumferential direction. When an incident beam I0 is incident to a reflective portion of the rotating plate 111, it is reflected to generate a beam I1. When the incident beam I0 is incident to a transmissive portion of the rotating plate 111, a beam I2 transmitted is reflected by a reflector 120 to become a beam I3, and the beam I3 is again transmitted by the transmissive portion of the rotating plate 111. This beam I3 has a delay different from that of the beam I1, and the beam I3 and the beam I1 advance regularly alternately in the same direction and on the same optical axis. Further, the reflector 120 is arranged as movable by a moving stage 130, and the delay amount of the beam I3 changes with movement of the reflector.

    5.
    发明专利
    未知

    公开(公告)号：DE69329763D1

    公开(公告)日：2001-01-25

    申请号：DE69329763

    申请日：1993-09-08

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： TAKAHASHI HIRONORI ,  AOSHIMA SHINICHIRO ,  HIRANO ISUKE

    IPC: G01R19/00 ,  G01R1/07 ,  H01L21/66 ,  G01R15/24 ,  G01R31/308

    Abstract: An E-O probe with improved spatial resolution has a light transmissive base part, an electro-optic material which is fixed to the base part and has an index of refraction which varies in response to an electrical field from a measured object, and a mirror which is fixed to the electro-optic material and reflects an incident beam penetrating the base part and the electro-optic material. The mirror is formed to be smaller than the incident beam in diameter. The electro-optic material is formed very thin.

    6.
    发明专利
    未知

    公开(公告)号：DE69418241T2

    公开(公告)日：1999-10-14

    申请号：DE69418241

    申请日：1994-01-26

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： NAKAMURA TAKUYA ,  HIRANO ISUKE ,  AOSHIMA SHINICHIRO ,  TAKAHASHI HIRONORI ,  URAKAMI TSUNEYUKI

    IPC: G01R19/00 ,  G01R1/07 ,  G01R15/16 ,  G01R15/22 ,  G01R31/28 ,  G01R31/312 ,  G01R15/24

    Abstract: This invention has as its object to provide a voltage measurement apparatus which has a compact probe unit, and which can perform a measurement in a non-contact manner. The voltage measurement apparatus includes detection means for detecting an electric field generated in a space by a voltage applied to the surface of a device to be measured, light-emitting means for modulating output light by superposing a detected signal obtained from the detection means on a bias current which is supplied to inductively radiate the output light, a constant current source for supplying the bias current to the light-emitting means, extraction means for extracting a signal component of the output light from the light-emitting means, and light-transmission means for guiding the output light from the light-emitting means to the extraction means, and measures the applied voltage to the surface of the device to be measured by bringing the detection means close to the device to be measured in a non-contact manner.

    9.
    发明专利
    未知

    公开(公告)号：DE69019477T2

    公开(公告)日：1996-01-18

    申请号：DE69019477

    申请日：1990-11-28

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： AOSHIMA SHINICHIRO ,  TAKAHASHI HIRONORI ,  TSUCHIYA YUTAKA

    IPC: G01J1/44 ,  G01R1/07 ,  G01R13/34 ,  G01R15/24 ,  G01R19/00 ,  G01R1/067 ,  G02F1/03

    Abstract: A light beam from a source (14) is chopped by a chopper (16) and split by a beam splitter (24) into two beams. The intensity of a first beam is changed by using, e.g., an electrooptic material (12) in accordance with a change in a signal to be detected, such as a voltage in an electronic device. The intensity of the first beam is detected by a first photodetector (22). The second beam is detected by a second photodetector (26) without its intensity being changed to provide a reference signal. At least one of the outputs of the first (22) and second (26) photodetectors are adjusted so that they are equal when no signal is applied to the light intensity changing means (12). The difference of the thus adjusted output signals is detected a narrow band detecting means (28) such as a lock-in amplifier (42C) in a narrow band at the chopping frequency to provide an output having a greater sensitivity.

    10.
    发明专利
    未知

    公开(公告)号：DE69206297D1

    公开(公告)日：1996-01-11

    申请号：DE69206297

    申请日：1992-03-25

    Applicant: HAMAMATSU PHOTONICS KK

    Inventor： TAKAHASHI HIRONORI ,  URAKAMI TSUNEYUKI ,  AOSHIMA SHINICHIRO

    IPC: G01R23/17 ,  G01R1/07 ,  G01R15/22 ,  G01R15/24 ,  G01R19/00 ,  G01R31/302 ,  G01R13/34 ,  G01R1/067

    Abstract: Polarized light pulses are input to an optical modulator (16) formed by an electrooptic crystal. The polarization state of the input light is changed in accordance with an electrical signal (i.e., voltage) applied to the optical modulator (16). Receiving the light output from the optical modulator, a polarization interferometer (18) produces an interference fringe on the input surface of a photodetector (20) such as a one-dimensional CCD. Based on an output signal of the photodetector (20), a processing device (22) calculates a pitch and a movement distance of the interference fringe to determine the voltage. A waveform of the electrical signal is measured while being sampled.

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