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公开(公告)号：JPH01302328A
公开(公告)日：1989-12-06
申请号：JP13386388
申请日：1988-05-31
Applicant: HAMAMATSU PHOTONICS KK
Inventor： OSUMI YASUTSUGU
Abstract: PURPOSE:To easily obtain a pulse train where a regular or irregular high-speed repeat light string group is repeated at a sufficiently long period by interposing an optical transparent medium between nonlinear optical mediums which generate higher harmonics of a pulse laser. CONSTITUTION:The laser pulse light outputted from a pulse laser generator 1 is converted to parallel rays by an optical system 2 and is made incident on a nonlinear optical medium 4 of a higher harmonic generator 3. The pulse light having a short period which is made incident on the nonlinear optical medium 4 is separated to the pulse light as a fundamental wave and the pulse light of the second harmonic wave. When these pulse light pass a transparent medium 5, they are different in passage time in the transparent medium 5 because the wavelength ratio of the fundamental wave to the second harmonic wave is 2:1. Consequently, a pulse light string having irregular pulse intervals is obtained by thickness of plural transparent mediums 5. Thus, only components having the same wavelength of the pulse light string are taken out by a prism 8 to obtain a prescribed high-speed repeat pulse light string.
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公开(公告)号：JPH01121827A
公开(公告)日：1989-05-15
申请号：JP28016487
申请日：1987-11-05
Applicant: HAMAMATSU PHOTONICS KK
Inventor： MATSUMOTO OSAMU , KOBAYASHI YUJI , OBAYASHI YASUSHI , SUZUKI HIDEO , SUZUKI TAKASHI , OSUMI YASUTSUGU
Abstract: PURPOSE:To miniaturize the title element with a simple structure by using a combination of a Fresnel lens and optical material to collimate the laser light from a semiconductor laser and to increase the power density thereof. CONSTITUTION:This element has the semiconductor laser 1, the Fresnel lens 2 which the laser from the semiconductor laser 1 enters, and the optical material 3 which the laser light from the Fresnel lens 2 enters. The optical material, i.e., a nonlinear optical crystal 3 is positioned by the prescribed disposition to take the prescribed plane of polarization of the laser light into consideration and the incident face 6 thereof is so cut out as to maximize the nonlinear effect. Grating patterns 8 are inscribed on the surface 7 of the Fresnel lens 2. The function equal to the function in the case of providing a collimating lens and condenser lens system is thereby obtd. and the optical element is made simple in the structure and small in the size.
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公开(公告)号：JPH01121825A
公开(公告)日：1989-05-15
申请号：JP28016387
申请日：1987-11-05
Applicant: HAMAMATSU PHOTONICS KK
Inventor： MATSUMOTO OSAMU , KOBAYASHI YUJI , OBAYASHI YASUSHI , SUZUKI HIDEO , SUZUKI TAKASHI , OSUMI YASUTSUGU
Abstract: PURPOSE:To provide the title element having a simple structure and small size by providing the function to collimate the laser light from a semiconductor laser to collimated beams of light and to increase the power density thereof to the optical material itself. CONSTITUTION:This optical element has the semiconductor laser 1 and the optical material 2 which the laser light from the semiconductor laser 1 enters. The function to collimate the laser light to the collimated beams of light and to increase the power density is provided to the optical material 2 itself. The optical material, i.e., a nonlinear optical crystal 2 is positioned by the prescribed disposition to take the prescribed plane of polarization of the laser light into consideration. The incident face 3 thereof is so cut out as to maximize the nonlinear effect. In addition, grating patterns 4 are inscribed on the incident face 3 of the nonlinear optical crystal 2. The function similar to the function in the case of providing a collimating lens or condenser lens system to the element is thereby obtd. and the optical element is made simpler in the structure and smaller in the size.
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公开(公告)号：JPS6443861A
公开(公告)日：1989-02-16
申请号：JP20058687
申请日：1987-08-11
Applicant: HAMAMATSU PHOTONICS KK
Inventor： OSUMI YASUTSUGU , KOSAKA NAOHISA
Abstract: PURPOSE:To obtain an optional device, capable of recording and reproducing a sound and a still picture by obtaining the still picture and a voice output by directly using the digital signal of a compact disk DC player. CONSTITUTION:The CD player optional device 4 is connected to the CD player 1. When a regional code, etc., desired to read, is inputted by an input part 31, an input decoding part 23 refers to a decoding table and accesses an objective region, and an address signal to designate the stored position of the region is outputted from a control part 21. A control drive part 12 receives the address signal, and drives and controls a pickup part 11, and in addition to map data for instance, the voice data of its explanation, etc., is read and outputted as the digital signal. A signal converting part 22 corrects the bit error, etc., of the read out digital data, and drives and controls a display drive part 32 and a voice drive part 34, the still picture and its explanation, etc., are outputted through a display part 33 and a speaker 35.
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公开(公告)号：JPS63184383A
公开(公告)日：1988-07-29
申请号：JP1580587
申请日：1987-01-26
Applicant: HAMAMATSU PHOTONICS KK
Inventor： OSUMI YASUTSUGU , MORITA NOBUHIRO , SUZUKI HIDEO , KOBAYASHI YUJI , OBAYASHI YASUSHI , MATSUMOTO OSAMU
Abstract: PURPOSE:To facilitate calibrating the wavelength scale of a wavelength reader for an output light and adjusting a light axis by a light axis regulator simultaneously by introducing a calibration light to the position of the light axis regulator in the latter stage of an optical parametric oscillator through a half mirror. CONSTITUTION:A continuous laser beam with a known wavelength, for instance the 2nd harmonic of an Nd-YAG laser device which is a laser beam with a wavelength of 530 nm, is generated and reflected and refracted by a half mirror 10 and transmitted through a light axis regulator 11 to a spectroscope 7. In the spectroscope 7, if there is a difference between a read sc ale value and the real wavelength of an inputted calibration light, the difference is calibrated. After the calibration in the spectroscope 7, a control signal is outputted and the crystal 5 of an optical parametric oscillator 6 is turned to vary the wavelength of the output light of the oscillator 6 so as to make the wavelength 530 nm which is equal to the wavelength of the calibration light in the spectroscope 7. As a discrepancy (d) of the light axis 8 of the output light is produced by the turn of the crystal 5, the calibration light is inputted so as to coincide with the cross point of the light from a wavelength calibration light source generator 18 axis 8 which is moved by the discrepancy (d) and the half mirror 10. Then a control signal is outputted from a light axis adjustment driving circuit 24 and the dielectric 17 of the light axis regulator 11 to adjust the light axis.
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Patent Agency Ranking
公开(公告)号：JPS63184382A
公开(公告)日：1988-07-29
申请号：JP1580387
申请日：1987-01-26
Applicant: HAMAMATSU PHOTONICS KK
Inventor： KOBAYASHI YUJI , OSUMI YASUTSUGU , SUZUKI HIDEO , MORITA NOBUHIRO , MATSUMOTO OSAMU , OBAYASHI YASUSHI
Abstract: PURPOSE:To obtain a stable output light without loss of a power density by a method wherein, even if an incident light misses the incident plane of a crystal, the crystal is moved by a transfer mechanism to correct the discrepancy and the matching conditions of the incident light are satisfied. CONSTITUTION:A part of the output of an optical parametric oscillator 6 is transmitted to a photosensor 22 and the position of a light axis is detected and the detected value is transmitted to a comparator 24. A datum obtained when there is no discrepancy of the light axis is supplied to the comparator 24 from a memory 23 and compared with the output of the light axis discrepancy caused by the rotation of a crystal 5 to output a signal corresponding to the discrepancy (h). If the discrepancy (h) becomes large to the extent that an incident light misses the incident plane of the crystal 5, a corresponding number of pulses are outputted from a calculator 25 and further transmitted to the linear pulse motor 18 of a transfer mechanism 16 through a pulse generator 20. Then a linearly-driven table is moved on linear guides 19 and 19 by the linear pulse motor 18 to correct the discrepancy of the incident light.
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公开(公告)号：JPS63165806A
公开(公告)日：1988-07-09
申请号：JP31090886
申请日：1986-12-27
Applicant: HAMAMATSU PHOTONICS KK
Inventor： OBAYASHI YASUSHI , SUZUKI HIDEO , MATSUMOTO OSAMU , KOBAYASHI YUJI , MORITA NOBUHIRO , OSUMI YASUTSUGU
Abstract: PURPOSE:To obtain required reflection band width by setting up the reflection factor of a multilayer film as a multivariable function expressed by the film thickness values of respective dielectric layers and determining the film thickness values of respective dielectric layers so that the difference between the function and the reflection factor of an objective wavelength is minimized. CONSTITUTION:A multilayer film mirror 5 is formed by alternately superposing dielectric films 61, 63... with a high refractive index nH and dielectric films 62, 64... with a low refractive index nL. The film thickness 61, 62... are respectively different and is not fixed. When the reflection factor Rlambda of the mirror 5 is defined as the multivariable function of the film thickness x1-xn of the films 61-6n, an equation I can be obtained. An equation II is obtained by specifying a reflection factor rlambda in each wavelength as objective spectral characteristics. In the equation II, a minimum value is substituted for the function F so that the difference between the multivariable function and the reflection factor of the objective wavelength is minimized to calculate the film thickness values x1-xn. Consequently, film constitution having the objective reflection factor characteristics can be obtained.
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公开(公告)号：JPS63161435A
公开(公告)日：1988-07-05
申请号：JP31007486
申请日：1986-12-24
Applicant: HAMAMATSU PHOTONICS KK
Inventor： KOBAYASHI YUJI , OSUMI YASUTSUGU , SUZUKI HIDEO , MORITA NOBUHIRO , MATSUMOTO OSAMU , OBAYASHI YASUSHI
Abstract: PURPOSE:To obtain a device easy for handling and to prevent the reduction of power density as well and to obtain a stable output light by correcting the optical axis in an n-th order harmonic generating part with respect to the optical axis deviation due to the change of the angle of incidence in an optical parametric oscillating part. CONSTITUTION:An incidence angle control part 14 which controls the incident angle between a crystal in an optical parametric oscillating part 1 and an n-th order harmonic generating part 2 and a mobile device 20 for optical axis correction which moves the n-th order harmonic generating part 2 to correct the deviation of the optical axis are provided. The angle of incident of the laser beam incident on the crystal in the optical parametric oscillating part 1 is changed by the incidence angle control part to emit the laser beam within a prescribed wavelength range, and for example, the angle of incidence is normally changed within the range of + or -30 deg. in case of an urea single crystal. When the optical axis is deviated in accordance with the variation by this change of the angle of incidence, it is detected by a photosensor 22 such as a solid-state image pickup element and the detection signal is sent to the mobile device 20. Then, this signal is compared with preliminarily set data to sent a pulse corresponding to the extent of deviation of the optical axis to the mobile device 20, and a motor is driven and the n-th order harmonic generating part 2 is moved in the direction crossing the optical axis to correct the deviation of the optical axis.
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公开(公告)号：JPS63159831A
公开(公告)日：1988-07-02
申请号：JP31007186
申请日：1986-12-24
Applicant: HAMAMATSU PHOTONICS KK
Inventor： OBAYASHI YASUSHI , SUZUKI HIDEO , MATSUMOTO OSAMU , KOBAYASHI YUJI , MORITA NOBUHIRO , OSUMI YASUTSUGU
Abstract: PURPOSE:To make the wavelength variable within the whole area cover range of a visible area, and to continuously obtain a high conversion efficiency and a stable and high output, by using an incident excitation light to a non-linear optical crystal, as the light beam of wavelength within a prescribed range from an excimer laser. CONSTITUTION:The excitation light 2 of wavelength lambdap is outputted from an excimer laser 1, made incident on a non-linear optical crystal 7 through a collimator lens 4 and an incident mirror 5, an optical parametric oscillation is generated, the oscillation light beams 9 of wavelength lambdas and lambdai are emitted through a mirror 6, and by turning a turning shaft 8, the rotary angle of the crystal 7 is controlled, and when a phase matching angle is changed, the wavelength lambdas and lambdai are charged continuously within a prescribed range. In accordance with the kind of the laser beam 1, the wavelength of the excitation light 2 becomes 308nm, 249nm, and 351nm respectively.
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公开(公告)号：JPS63159829A
公开(公告)日：1988-07-02
申请号：JP31007286
申请日：1986-12-24
Applicant: HAMAMATSU PHOTONICS KK
Inventor： SUZUKI HIDEO , OSUMI YASUTSUGU , MORITA NOBUHIRO , MATSUMOTO OSAMU , KOBAYASHI YUJI , OBAYASHI YASUSHI
Abstract: PURPOSE:To obtain a laser light whose pulse width is a high level output and whose wavelength is variable, by a simple constitution, by allowing laser excitation light to be made incident on a ureas single crystal whose single crystal turning angle is controlled. CONSTITUTION:The laser excitation light 23 from a laser oscillator 21 is turned centering around a turning shaft 28 and made incident on a urea single crystal whose turning angle is controlled and whose non-linear optical constant is large, and a laser light 29 whose phase matching angle is controlled and whose wavelength is varied by following up the variation of an incident angle is emitted from a crystal 22. Since the urea single crystal whose non-linear constant is high is used by this simple constitution which requires no mirror, a large power is obtained, and when an excitation light whose pulse width is a picosecond and whose energy density is large is made incident, a laser emitted light whose pulse width is a picosecond, whose energy density is high and whose wavelength is variable can be obtained.
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