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公开(公告)号：EP0798825A3
公开(公告)日：1998-07-22
申请号：EP97302040
申请日：1997-03-25
Applicant: HAMAMATSU PHOTONICS KK
Inventor： AOSHIMA SHINICHIRO , ITO HARUYASU , TSUCHIYA YUTAKA
CPC classification number: H01S3/1112 , H01S3/0811 , H01S3/0816 , H01S3/09415 , H01S3/102 , H01S3/105
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.
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公开(公告)号：DE60138543D1
公开(公告)日：2009-06-10
申请号：DE60138543
申请日：2001-03-06
Applicant: HAMAMATSU PHOTONICS KK
Inventor： TSUCHIYA YUTAKA
Abstract: A method comprises a first step of dividing a measured medium into N voxels; a second step of assuming an imaginary medium identical to the measured medium except for absence of absorption; a third step of setting a light injection position and a light detection position for the imaginary medium; a fourth step of calculating an impulse response s(t) at the light detection position; a fifth step of calculating a probability density Ui(t',t) that the impulse response at a time t at the light detection position has existed in voxel i (i = 1,..., N; 1 ≤ N) at a point of time t' (0 ≤ t' ≤ t); a sixth step of calculating a cumulative probability Ui(t) that the impulse response detected at the time t has existed in voxel i, from Ui(t',t); and an eighth step of calculating a time-resolved path length li in voxel i from Ui(t) and s(t).
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公开(公告)号：DE69737544T2
公开(公告)日：2007-12-13
申请号：DE69737544
申请日：1997-10-03
Applicant: HAMAMATSU PHOTONICS KK
Inventor： TSUCHIYA YUTAKA , YAMASHITA YUTAKA
Abstract: A measuring apparatus of absorption information of scattering medium, comprising a light source for generating pulsed light, a light incidence section for making the pulsed light incident to a scattering medium, a light receiving section for receiving the light having propagated inside the measured object, a signal detecting section for temporally cutting a portion out of a light signal obtained by the light receiving section to acquire a measurement signal corresponding to the cut-out signal, a first arithmetic section for performing a measurement for acquiring measurement signals respectively at plural different timings or the like and for deriving a time integration value and a mean optical pathlength for each of the plural measurement signals obtained, and a second arithmetic section for calculating a change amount of concentration of an absorptive constituent, based on a predetermined relation among plural time integration values, plural mean optical pathlengths, an absorption coefficient per unit concentration of the absorptive constituent, and the change amount of concentration of the absorptive constituent.
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公开(公告)号：DE69928392T2
公开(公告)日：2006-08-03
申请号：DE69928392
申请日：1999-05-24
Applicant: HAMAMATSU PHOTONICS KK
Inventor： TSUCHIYA YUTAKA
IPC: A61K31/435 , G01B11/00 , D06M13/184 , G01N21/17 , F25B5/02 , G01F23/02 , G01J1/04 , G01N21/47 , G01T1/29
Abstract: A method of measuring the internal characteristic distribution of a scattering/absorbing body, comprising allowing a light beam to enter a medium to be measured, detecting the light beam transmitted through the medium, collecting measured values of a predetermined parameter for each of combinations of the position where the light beam enters and the position where the light beam is detected, setting a reference value of the absorption coefficient, finding estimated values of the parameter for each of the combinations, defining a weight function for each voxel according to the micro-Beer-Lambert's law, calculating the differences in absorption coefficient between voxels by using the measured values of the parameter, the estimated values, and the weight function, and calculating the absolute values of the absorption coefficients of the voxels.
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公开(公告)号：DE69925930T2
公开(公告)日：2006-05-11
申请号：DE69925930
申请日：1999-11-05
Applicant: HAMAMATSU PHOTONICS KK
Inventor： TSUCHIYA YUTAKA
Abstract: A method and a device for measuring internal information of a scattering absorber, wherein a pulsed light with a plurality of specified wavelengths or a modulated light with a plurality of specified frequencies is shone into a scattering absorber (1) to be measured from a light source (5), an outgoing light is detected by a photodetector (7), and then internal information is operated and calculated by a signal processing unit (8) and a processing unit (9), whereby internal information of the scattering absorber is obtained by calculating an absorption coefficient difference, by a spectroscopic measuring method (MVS method) using an optical path length average and dispersion or equivalent physical quantities and by utilizing an MBL low-based time-resolved integration measuring (TIS) method and a phase modulation measuring (PMS) method to thereby enable high-accuracy, high-speed measurement of internal information of a scattering absorber (1).
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Patent Agency Ranking
公开(公告)号：DE69918968T2
公开(公告)日：2005-07-28
申请号：DE69918968
申请日：1999-04-01
Applicant: HAMAMATSU PHOTONICS KK
Inventor： TSUCHIYA YUTAKA , URAKAMI TSUNEYUKI
Abstract: A concentration measuring apparatus for an absorption component in a scattering medium includes a light source (2) for generating at least two light rays having predetermined wavelengths, the light rays having different transport scattering coefficients for a scattering medium (20) as an object to be measured, and a known ratio of the transport scattering coefficients; light incidence means (6) for making the light rays incident from a light incident position into the scattering medium (20); photodetection means (12), (13) for detecting the light ray which has propagated inside the scattering medium (20) at at least one photodetection position different from the light incident position to acquire at least one photodetection signal; parameter detection means (15) for detecting, on the basis of the photodetection signal, a light intensity and a mean flight pathlength at the light detection position for each of the at least two light rays having predetermined wavelengths; and arithmetic processing means (16) for calculating a concentration of an absorption component on the basis of a predetermined relationship between the ratio of the transport scattering coefficients, the light intensity, the mean flight pathlength, and a difference between absorption coefficients per unit concentration of the absorption component for the at least two light rays having predetermined wavelengths.
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公开(公告)号：DE69632437T2
公开(公告)日：2005-05-12
申请号：DE69632437
申请日：1996-08-22
Applicant: HAMAMATSU PHOTONICS KK
Inventor： URAKAMI TSUNEYUKI , MIWA MITSUHARU , YAMASHITA YUTAKA , TSUCHIYA YUTAKA
Abstract: An optical measuring method comprising: a first step of, in a first state in which a measured object (45) is placed in a predetermined place (40), emitting probe light from a light source (10) onto the measured object (45) and detecting the probe light transmitted or reflected by said measured object by means of light detecting means (16) to obtain a first mean time delay of said probe light; a second step of, in a second state in which the measured object (45) is not placed in said predetermined place (40), emitting the probe light from said light source (10) to the predetermined place (40) and detecting the probe light passing through said predetermined place without intervention of said measured object (45) by said light detecting means (16) to obtain a second mean time delay; and a third step of subtracting said second mean time delay from said first mean time delay to obtain a true mean time delay.
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公开(公告)号：DE69433677T2
公开(公告)日：2005-03-24
申请号：DE69433677
申请日：1994-12-01
Applicant: HAMAMATSU PHOTONICS KK
Inventor： TSUCHIYA YUTAKA , OHTA KAZUYOSHI , URAKAMI TSUNEYUKI
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公开(公告)号：DE69918968D1
公开(公告)日：2004-09-02
申请号：DE69918968
申请日：1999-04-01
Applicant: HAMAMATSU PHOTONICS KK
Inventor： TSUCHIYA YUTAKA , URAKAMI TSUNEYUKI
Abstract: A concentration measuring apparatus for an absorption component in a scattering medium includes a light source (2) for generating at least two light rays having predetermined wavelengths, the light rays having different transport scattering coefficients for a scattering medium (20) as an object to be measured, and a known ratio of the transport scattering coefficients; light incidence means (6) for making the light rays incident from a light incident position into the scattering medium (20); photodetection means (12), (13) for detecting the light ray which has propagated inside the scattering medium (20) at at least one photodetection position different from the light incident position to acquire at least one photodetection signal; parameter detection means (15) for detecting, on the basis of the photodetection signal, a light intensity and a mean flight pathlength at the light detection position for each of the at least two light rays having predetermined wavelengths; and arithmetic processing means (16) for calculating a concentration of an absorption component on the basis of a predetermined relationship between the ratio of the transport scattering coefficients, the light intensity, the mean flight pathlength, and a difference between absorption coefficients per unit concentration of the absorption component for the at least two light rays having predetermined wavelengths.
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公开(公告)号：AU2003292594A1
公开(公告)日：2004-07-14
申请号：AU2003292594
申请日：2003-12-19
Applicant: HAMAMATSU PHOTONICS KK
Inventor： TAKAHASHI HIRONORI , INOUE TAKASHI , OHSUKA SHINJI , TSUCHIYA YUTAKA
Abstract: The present invention relates to a high-speed particle generating method and so on for generating high-speed particles from a high-speed particle generating target by condensing a pulsed laser beam to a micro-spot on the surface of a high-speed particle generating target. The high-speed particle generating method is a method that generates high-speed particles by condensing a pulsed laser beam generated from a pulsed laser beam generator through an irradiation optical system at a predetermined condensing point, and irradiating the pulsed laser beam to the high-speed particle generating target that is set at the predetermined condensing point, the method including a first step of preparing a reference data, a second step of measuring the wave front of the pulsed laser beam, and a third step of compensating the wave front of the pulsed laser beam based on the reference data.
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