公开(公告)号：JPH0322069B2

公开(公告)日：1991-03-26

申请号：JP1580387

申请日：1987-01-26

Applicant: HAMAMATSU PHOTONICS KK

Inventor： KOBAYASHI JUJI ,  OOSUMI YASUTSUGU ,  SUZUKI HIDEO ,  MORITA NOBUHIRO ,  MATSUMOTO OSAMU ,  OOHAYASHI YASUSHI

IPC: H01S3/10 ,  G02F1/39 ,  H01S3/108

公开(公告)号：JPS63258088A

公开(公告)日：1988-10-25

申请号：JP9290687

申请日：1987-04-15

Applicant: HAMAMATSU PHOTONICS KK

Inventor： SUZUKI HIDEO ,  OSUMI YASUTSUGU ,  MORITA NOBUHIRO ,  MATSUMOTO OSAMU ,  KOBAYASHI YUJI ,  OBAYASHI YASUSHI

IPC: H01S3/109

Abstract: PURPOSE:To obtain a device which is small in fluctuation and rapid in shift of wavelength, and efficient and moreover surely protected against damage of crystal by a method wherein a light parametric oscillator varies oscillating light in wavelength by changing incident angle of excited light incident on niobic acid kalium crystal and a secondary harmonic generator are provided. CONSTITUTION:A niobic acid kalium crystal 16 is provided between an incident mirror 14 and a projecting mirror 15, a light parametric oscillator 10 in wavelength outputted through the intermediary of a projecting mirror 15 by changing incident angle of excited light incident on a niobic acid kalium crystal 16 through the intermediary of the incident mirror 14 and a secondary harmonic generator 11 which outputs secondary harmonic of incident light, which is the oscillating light 20 outputted from the said parametric oscillator 10, as projecting light 25 by controlling incident angle of the said light incident on a niobic acid kalium crystal 23 are provided. The said light parametric oscillator 10 and the said secondary harmonic generator 11 are, for example, rendered to control incident angle of the excited light 12 or the oscillating light 20 incident on the crystals 16 or 23 by rotating the crystals 16 or 23 respectively.

公开(公告)号：JPS63184384A

公开(公告)日：1988-07-29

申请号：JP1580487

申请日：1987-01-26

Applicant: HAMAMATSU PHOTONICS KK

Inventor： KOBAYASHI YUJI ,  OBAYASHI YASUSHI ,  SUZUKI HIDEO ,  OSUMI YASUTSUGU ,  MORITA NOBUHIRO ,  MATSUMOTO OSAMU

IPC: H01S3/10 ,  G02F1/37 ,  H01S3/109

Abstract: PURPOSE:To obtain a laser whose wavelength can be varied in a wide band by providing a rotator which is conposed of 1st rotating part which turns a crystal for a light wavelength converter (2nd harmonic generator) in a plane parallel to a light axis and 2nd rotating part which turns the crystal in a olane vertical to the light axis. CONSTITUTION:An ordinary light (o-component) of the output light of optical parametric oscillator (OPO) 1 is applied to a 2nd harmonic generator (SHG) 2 and a SHG crystal 9 is turned in a plane parallel to a light axis 10 by the 1st rotating part 16 of a rotator 18. If the rotation angle (theta) is varied within the range of 90-50 degrees, an output wavelength is varied as shown by a characteristic curve (C). Then, if the motor 27 of the 2nd rotating part 17 of the rotator 18 is turned 360 degrees, an index table 23 is turned 90 degrees with the light axis 10 as a center of turning by a parallel index cam 24. Then, an e-component, which is an extraordinary light for the SHG crystal 9, is turned into an ordinary light. In this state, the SHG crystal 9 is turned by the motor 20 of the 1st rotating part 16 for phase matching and the wavelength conversion is applied to the ordinary light component of the SHG output as shown by a characteristic curve (D). As a result, even if the rotation range is 90-50 degrees, a laser whose wavelength can be varied over the whole range of 250-1230 nm can be obtained.

公开(公告)号：JPS63170982A

公开(公告)日：1988-07-14

申请号：JP255187

申请日：1987-01-08

Applicant: HAMAMATSU PHOTONICS KK

Inventor： MATSUMOTO OSAMU ,  KOBAYASHI YUJI ,  OBAYASHI YASUSHI ,  SUZUKI HIDEO ,  MORITA NOBUHIRO ,  OSUMI YASUTSUGU

IPC: H01S3/10 ,  G02B27/09 ,  H01S3/00 ,  H01S3/108

Abstract: PURPOSE:To maintain power density of a laser incident at a crystal at an optimum value by providing some of plural lenses with driving devices for reducing and enlarging a beam diameter of optional magnification by regulating a lens position. CONSTITUTION:The first and second lenses 11 and 12 of the first, second and third lenses 11, 12 and 13 are provided lens driving devices 14 and 15 respectively for positional shifting. The distance from the back face of the first lens 11 to the front face of the lens 12 shall be L1 and the distance from the rear face of the second lens 12 to the rear face of the third lens 13 shall be L2. Magnification can be changed by shifting at least either of the first and second lenses 11 and 12, shifting is so performed that the distance between L1 and L2 may have a prescribed relation lest a projected beam from the third lens 13 should diverge, converge and damage a crystal. Thereby, magnification of the beam diameter can be optionally regulated so as to easily regulate it to the optimum condition even if an output beam diameter, power and pulse width are changed according to the kind of laser, solid difference and change with the lapse of time.

公开(公告)号：JPS63165825A

公开(公告)日：1988-07-09

申请号：JP31090686

申请日：1986-12-27

Applicant: HAMAMATSU PHOTONICS KK

Inventor： MATSUMOTO OSAMU ,  KOBAYASHI YUJI ,  OBAYASHI YASUSHI ,  SUZUKI HIDEO ,  MORITA NOBUHIRO ,  OSUMI YASUTSUGU

IPC: H01S3/10 ,  G02F1/37 ,  G02F1/39 ,  H01S3/108 ,  H01S3/109

Abstract: PURPOSE:To prevent an optical axis from being sheared by providing the dielectric substance to correct the shear of the optical axis generated at the time of turning a non-linear optical crystal face and rotating the dielectric substance. CONSTITUTION:A signal for obtaining a projecting laser beams with an objective wavelength lambda is inputted from an input terminal 29 to a CPU 25. The CPU 25 rotates the non-linear optical crystal 6 by a prescribed angle theta0 through a driving circuit 23 and a driving device 11. Since the wavelength of the projection laser beam is changed, the optical axis 12 is moved in parallel by a prescribed distance (d). The CPU 25 receives the parallel moving distance (d), calculates a rotational angle theta1 corresponding to the distance (d) and rotates the dielectric substance 13 by the rotational angle theta1 through a driving circuit 24 and a dielectric substance driving circuit 15. Consequently, the optical axis 14 after diffraction can be always allowed to coincide with the optical axis 10 of the incident laser.

公开(公告)号：JPS63159830A

公开(公告)日：1988-07-02

申请号：JP31007086

申请日：1986-12-24

Applicant: HAMAMATSU PHOTONICS KK

Inventor： SUZUKI HIDEO ,  OSUMI YASUTSUGU ,  MORITA NOBUHIRO ,  MATSUMOTO OSAMU ,  KOBAYASHI YUJI ,  OBAYASHI YASUSHI

IPC: H01S3/10 ,  G02F1/35 ,  G02F1/355 ,  G02F1/361 ,  G02F1/39 ,  H01S3/108

Abstract: PURPOSE:To simplify the structure of an incident mirror and an emitting mirror, and to make manufacturing easy by setting a reflection factor to the oscillation light of the incident mirror and the emitting mirror, to a specific value. CONSTITUTION:Laser oscillation and excitation light 7 by a pulse oscillation type Nd-YAG laser 1, and mirrors 5, 6 is made incident on a collimator lens 10, an incident mirror 11 of a dielectric multi-layer vapor-deposited film, a non-linear optical crystal 13 for varying the wavelength of an emitting layer by controlling a turning incident angle, and an optical parametric oscillator 8 provided with the same emitting mirror 14 as the mirror 11, and an oscillation light 15 whose wavelength is variable is emitted. A reflection factor to the oscillation light of these mirrors 11, 14 is set to a small value of about 50% and the transmittivity becomes larger remarkably, the number of layers of the dielectric multi-layer vapor-deposited film can be decreased remarkably to 10 layers, etc., the structure of the incident mirror and the emitting mirror is simplified and they can be manufactured easily.

公开(公告)号：JPS61183858A

公开(公告)日：1986-08-16

申请号：JP2287285

申请日：1985-02-08

Applicant: HAMAMATSU PHOTONICS KK

Inventor： MORITA NOBUHIRO

IPC: H01J31/50

Abstract: PURPOSE:To prevent the generation of electric discharge so as to produce a great acceleration electric field by locating the fixed area of the metallic mesh of a photoelectron-accelerating electrode for an image tube apart from the photoelectric screen without changing the distance between the mesh and the photoelectric screen. CONSTITUTION:A Kovar mesh ring 21 is used to fix a copper mesh 23 and the outer periphery of the surface of the mesh ring 21 facing a photoelectric screen is thinner than the chamfered inner periphery. After the mesh 23 is placed on the ring 21, a ring 22 made of a stainless steel is pressed upon the periphery of the mesh 23 and fixed by spot welding, thereby making an electrode. This electrode is used as a photoelectron-accelerating electrode 2 for an image tube such as a mesh-like electrode for a streak tube which is used to accelerate optical electrons emitted from a photoelectric screen 1 in a high electric field. Therefore, even when the acceleration electric field between the photoelectric screen 1 and the accelerating electrode 2 is increased, it is possible to prevent electric discharge from developing in welded spots 24. Consequently, it is possible to achieve improved time resolution.