Patents by Inventor Tadashi Kasamatsu

Tadashi Kasamatsu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20120025185
    Abstract: An electroluminescence device (1) realizes high light emission efficiency, high durability, and high extraction efficiency. The device includes electrodes (11, 17); a plurality of layers (12 through 16) that are deposited between the electrodes (11, 17); and a light emitting region (14) between the plurality of layers (12 through 16). The light emitting region (14) emits light by application of an electric field between the electrodes (11, 17). The thickness and the refractive index of each of the plurality of layers (12 through 16) satisfy a resonance condition in the electroluminescence device (1) that makes a region in which the intensity of the electric field of a standing wave (19) by the light emitted from the light emitting region (14) is the highest substantially coincide with the light emitting region (14). A metal member (20) that induces plasmon resonance on the surface thereof by the emitted light is arranged in the vicinity of the light emitting region (14).
    Type: Application
    Filed: March 29, 2010
    Publication date: February 2, 2012
    Applicant: FUJIFILM CORPORATION
    Inventor: Tadashi Kasamatsu
  • Patent number: 7953127
    Abstract: In a mode-locked laser-diode-excited laser apparatus: a solid-state laser medium is arranged at a distance of at most twice the Rayleigh range from a saturable absorbing mirror with a depth of absorbing modulation of at least 0.4%; the total intracavity dispersion is smaller than zero and makes oscillating light have such a pulse bandwidth that the saturable absorbing mirror can suppress a background pulses other than soliton pulses repeated with a fundamental repetition period, and the magnitude of the total intracavity dispersion has a predetermined relationship with a pulse width of the oscillating light; and an output mirror is a negative-dispersion mirror being constituted by two multilayer mirrors and a cavity layer sandwiched between the two multilayer mirrors, and causing a mirror dispersion of ?3000 fsec2 to ?600 fsec2 and realizes a reflectance of 97% to 99.5%.
    Type: Grant
    Filed: June 19, 2009
    Date of Patent: May 31, 2011
    Assignee: FUJIFILM Corporation
    Inventors: Tadashi Kasamatsu, Shogo Yamazoe, Makio Usui
  • Patent number: 7949018
    Abstract: In a mode-locked laser-diode-excited laser apparatus: a solid-state laser medium is arranged at a distance of at most twice the Rayleigh range from a saturable absorbing mirror with a depth of absorbing modulation of at least 0.4%; the total intracavity dispersion is smaller than zero and makes oscillating light have such a pulse bandwidth that the saturable absorbing mirror can suppress a background pulses other than soliton pulses repeated with a fundamental repetition period, and the magnitude of the total intracavity dispersion has a predetermined relationship with a pulse width of the oscillating light; and an output mirror is a negative-dispersion mirror being constituted by three or more multilayer mirrors and cavity layers arranged at predetermined intervals between the three or more multilayer mirrors, and causing a mirror dispersion of ?3000 fsec2 to ?600 fsec2 and realizes a reflectance of 97% to 99.5%.
    Type: Grant
    Filed: June 19, 2009
    Date of Patent: May 24, 2011
    Assignee: FUJIFILM Corporation
    Inventors: Tadashi Kasamatsu, Shogo Yamazoe, Makio Usui
  • Patent number: 7889768
    Abstract: A mode-locked solid-state laser apparatus having a resonator which includes a solid-state laser medium, a saturable absorption mirror, and a negative group dispersion element therein, in which the solid-state laser medium and the saturable absorption mirror are disposed at a distance not greater than twice a Rayleigh length which is determined by the beam radius of oscillation light formed at the saturable absorption mirror. The apparatus further includes a dichroic mirror in the resonator that reflects excitation light inputted from a direction crossing the optical axis of the resonator toward the solid-state laser medium and transmits oscillation light.
    Type: Grant
    Filed: October 6, 2008
    Date of Patent: February 15, 2011
    Assignee: Fujifilm Corporation
    Inventor: Tadashi Kasamatsu
  • Patent number: 7864821
    Abstract: In a soliton mode-locked solid-state laser apparatus having a resonator which includes therein a solid-state laser medium, a saturable absorption mirror, and a negative group velocity dispersion element, the solid-state laser medium and saturable absorption mirror are disposed in close proximity to each other at a distance not greater than twice a Rayleigh length. Then, the absorption modulation depth ?R of the the saturable absorption mirror is set to a value not less than 0.4%, and the absolute value |D| (D<0) of a total intracavity dispersion amount D when light having a predetermined wavelength makes one round trip in the resonator, which is represented by the following relational expression, is set within a pulse bandwidth in which operation modes other than a fundamental period soliton pulse can be suppressed by the saturable absorption mirror. ? P = 1.
    Type: Grant
    Filed: September 29, 2008
    Date of Patent: January 4, 2011
    Assignee: FUJIFILM Corporation
    Inventor: Tadashi Kasamatsu
  • Patent number: 7769070
    Abstract: Two end facets of a solid state laser medium function as resonating mirrors that cause a pumping light beam to resonate within the solid state laser medium, which becomes a resonator. A pumping means outputs the pumping light beam, having at least two longitudinal modes and a coherence length greater than or equal to the resonator length of the resonator, to be input to the solid state laser medium such that the laser beam resonates within the resonator.
    Type: Grant
    Filed: July 26, 2007
    Date of Patent: August 3, 2010
    Assignee: FUJIFILM Corporation
    Inventor: Tadashi Kasamatsu
  • Publication number: 20100103960
    Abstract: There is provided a mode locked laser device including: a cavity, the cavity having a semiconductor saturable absorbing mirror and a negative dispersion mirror that controls group velocity dispersion within the cavity, disposed in a straight line; a solid-state laser medium, disposed in the cavity and outputting oscillating light due to excitation light being incident thereon; an excitation unit that causes the excitation light to be incident on the solid-state laser medium; and a cavity holder, the light incident face of the semiconductor saturable absorbing mirror attached to one end of the cavity holder, the negative dispersion mirror attached to the other end of the cavity holder, and the cavity holder integrally supporting the semiconductor saturable absorbing mirror and the negative dispersion mirror.
    Type: Application
    Filed: October 20, 2009
    Publication date: April 29, 2010
    Applicant: FUJIFILM CORPORATION
    Inventors: Tadashi KASAMATSU, Shogo YAMAZOE, Yutaka KOROGI
  • Publication number: 20100037695
    Abstract: A photoacoustic imaging apparatus is equipped with: light generating means, for emitting measuring light; light irradiating means, for irradiating the measuring light onto a target; ultrasound detecting means, for detecting ultrasonic waves which are generated in the target portion by the irradiation of the measuring light; and tomographic image obtaining means, for obtaining a tomographic image of the target based on signals of the detected ultrasonic waves. The light generating means includes a pulse laser and light modulating means, which are employed to emit a pulse train having a plurality of pulse beams having pulse widths within a range from 1 nsec to 100 nsec as the measuring light. The tomographic image obtaining means generates processed signals by performing a correlating process between transmission signals of the pulse train and the signals of the ultrasonic waves, and obtains the tomographic image of the target based on the processed signals.
    Type: Application
    Filed: August 13, 2009
    Publication date: February 18, 2010
    Inventors: Kazuhiro TSUJITA, Tadashi Kasamatsu
  • Publication number: 20090316737
    Abstract: In a mode-locked laser-diode-excited laser apparatus: a solid-state laser medium is arranged at a distance of at most twice the Rayleigh range from a saturable absorbing mirror with a depth of absorbing modulation of at least 0.4%; the total intracavity dispersion is smaller than zero and makes oscillating light have such a pulse bandwidth that the saturable absorbing mirror can suppress a background pulses other than soliton pulses repeated with a fundamental repetition period, and the magnitude of the total intracavity dispersion has a predetermined relationship with a pulse width of the oscillating light; and an output mirror is a negative-dispersion mirror in which high-index layers and low-index layers, having optical thicknesses randomly varying in the range of one-eighth to half of the predetermined wavelength, are alternately laminated, and the negative-dispersion mirror causes a mirror dispersion of ?1000 fsec2 to ?100 fsec2 and realizes a reflectance of 97% to 99.5%.
    Type: Application
    Filed: June 22, 2009
    Publication date: December 24, 2009
    Applicant: FUJIFILM Corporation
    Inventors: Tadashi Kasamatsu, Shogo Yamazoe, Makio Usui
  • Publication number: 20090316735
    Abstract: In a mode-locked laser-diode-excited laser apparatus: a solid-state laser medium is arranged at a distance of at most twice the Rayleigh range from a saturable absorbing mirror with a depth of absorbing modulation of at least 0.4%; the total intracavity dispersion is smaller than zero and makes oscillating light have such a pulse bandwidth that the saturable absorbing mirror can suppress a background pulses other than soliton pulses repeated with a fundamental repetition period, and the magnitude of the total intracavity dispersion has a predetermined relationship with a pulse width of the oscillating light; and an output mirror is a negative-dispersion mirror being constituted by three or more multilayer mirrors and cavity layers arranged at predetermined intervals between the three or more multilayer mirrors, and causing a mirror dispersion of ?3000 fsec2 to ?600 fsec2 and realizes a reflectance of 97% to 99.5%.
    Type: Application
    Filed: June 19, 2009
    Publication date: December 24, 2009
    Applicant: FUJIFILM Corporation
    Inventors: Tadashi Kasamatsu, Shogo Yamazoe, Makio Usui
  • Publication number: 20090316736
    Abstract: In a mode-locked laser-diode-excited laser apparatus: a solid-state laser medium is arranged at a distance of at most twice the Rayleigh range from a saturable absorbing mirror with a depth of absorbing modulation of at least 0.4%; the total intracavity dispersion is smaller than zero and makes oscillating light have such a pulse bandwidth that the saturable absorbing mirror can suppress a background pulses other than soliton pulses repeated with a fundamental repetition period, and the magnitude of the total intracavity dispersion has a predetermined relationship with a pulse width of the oscillating light; and an output mirror is a negative-dispersion mirror being constituted by two multilayer mirrors and a cavity layer sandwiched between the two multilayer mirrors, and causing a mirror dispersion of ?3000 fsec2 to ?600 fsec2 and realizes a reflectance of 97% to 99.5%.
    Type: Application
    Filed: June 19, 2009
    Publication date: December 24, 2009
    Applicant: FUJIFILM Corporation
    Inventors: Tadashi KASAMATSU, Shogo YAMAZOE, Makio USUI
  • Publication number: 20090116516
    Abstract: A mode-locked solid-state laser apparatus having a resonator which includes a solid-state laser medium, a saturable absorption mirror, and a negative group dispersion element therein, in which the solid-state laser medium and the saturable absorption mirror are disposed at a distance not greater than twice a Rayleigh length which is determined by the beam radius of oscillation light formed at the saturable absorption mirror. The apparatus further includes a dichroic mirror in the resonator that reflects excitation light inputted from a direction crossing the optical axis of the resonator toward the solid-state laser medium and transmits oscillation light.
    Type: Application
    Filed: October 6, 2008
    Publication date: May 7, 2009
    Applicant: FUJIFILM Corporation
    Inventor: Tadashi KASAMATSU
  • Publication number: 20090086771
    Abstract: In a mirror including a substrate and a dielectric multilayer coating structure formed on the substrate, the multilayer coating structure includes two mirror-function layer portions, each formed by a plurality of Layers deposited one on another, and a cavity layer that is arranged between the two mirror-function layer portions, and which causes light having a predetermined wavelength to resonate between the two mirror-function layer portions. Further, a dispersion value with respect to the light having the predetermined wavelength is in the range of ?600 fs2 to ?3000 fs2 and a reflectance with respect to the light having the predetermined wavelength is in the range of 97% to 99.5%.
    Type: Application
    Filed: September 26, 2008
    Publication date: April 2, 2009
    Inventors: Makio USUI, Tadashi Kasamatsu, Shogo Yamazoe
  • Publication number: 20090086772
    Abstract: In a soliton mode-locked solid-state laser apparatus having a resonator which includes therein a solid-state laser medium, a saturable absorption mirror, and a negative group velocity dispersion element, the solid-state laser medium and saturable absorption mirror are disposed in close proximity to each other at a distance not greater than twice a Rayleigh length. Then, the absorption modulation depth ?R of the the saturable absorption mirror is set to a value not less than 0.4%, and the absolute value |D|(D<0) of a total intracavity dispersion amount D when light having a predetermined wavelength makes one round trip in the resonator, which is represented by the following relational expression, is set within a pulse bandwidth in which operation modes other than a fundamental period soliton pulse can be suppressed by the saturable absorption mirror. ? P = 1.
    Type: Application
    Filed: September 29, 2008
    Publication date: April 2, 2009
    Applicant: FUJIFILM Corporation
    Inventor: Tadashi KASAMATSU
  • Publication number: 20090028205
    Abstract: A dispersion compensator which is compact, low loss, low cost, and highly stable, and yet capable of varying the dispersion compensation amount without changing the output position of an output beam. The dispersion compensator includes: a first and a second planar mirrors disposed parallel to each other, wherein at least either one of the mirrors has group velocity dispersion whose value varies according to the incident angle of light incident on the mirror; a mirror holding means rotatably holding the first and second mirrors in a direction in which the incident angle of light incident on the first mirror is changed while maintaining the parallel state of the mirrors; and a third mirror disposed so as not to be rotated with the first and second mirrors and reflects light reflected sequentially by the first mirror and the second mirror.
    Type: Application
    Filed: July 25, 2008
    Publication date: January 29, 2009
    Applicant: FUJIFILM Corporation
    Inventor: Tadashi KASAMATSU
  • Publication number: 20080251211
    Abstract: Disclosed is a compact and convenient apparatus for producing corrugated cardboard, which solves or at least lightens the problem that the plant is too long. In this apparatus a component (I) for completing a single facer corrugated cardboard is disposed on the first floor (G); a component (II) for preparing incomplete corrugated card board on the second floor deck (U); a component (III) for obtaining the complete corrugated cardboard on the slope which goes down gradually and linearly from the second floor deck to the first floor; and a component (IV) for drawing the product corrugated cardboard and delivering to the next processing steps on the first floor.
    Type: Application
    Filed: April 11, 2007
    Publication date: October 16, 2008
    Applicant: AIKI KOGYO KABUSHIKI KAISHA
    Inventors: Toshimitsu Akiyama, Tadashi Kasamatsu
  • Publication number: 20080069156
    Abstract: Two end facets of a solid state laser medium function as resonating mirrors that cause a pumping light beam to resonate within the solid state laser medium, which becomes a resonator. A pumping means outputs the pumping light beam, having at least two longitudinal modes and a coherence length greater than or equal to the resonator length of the resonator, to be input to the solid state laser medium such that the laser beam resonates within the resonator.
    Type: Application
    Filed: July 26, 2007
    Publication date: March 20, 2008
    Applicant: FUJIFILM Corporation
    Inventor: Tadashi KASAMATSU
  • Patent number: 6914915
    Abstract: A laser amplifier includes a gain medium of a glass fiber, a first exciting light source, a second exciting light source, and another first exciting light source. The gain medium of the glass fiber includes rare earth dopant in a host medium. Ions of the rare earth dopant has an energy level structure including a ground level and a pair of laser upper level and laser lower levels between which a stimulated transition is to be produced after production of a population inversion between the pair of laser upper and laser lower levels. The pair of laser upper and laser lower levels being higher than the ground level. The first exciting light source is coupled to the input side of the glass fiber for introducing first exciting light to the glass fiber to produce the population inversion.
    Type: Grant
    Filed: February 23, 2001
    Date of Patent: July 5, 2005
    Assignee: NEC Corporation
    Inventor: Tadashi Kasamatsu
  • Patent number: 6697393
    Abstract: Two semiconductor laser light sources for outputting light of two properly selected wavelengths are employed as excitation light sources. That is, as excitation light sources, there are used a first semiconductor laser excitation light source for exciting ion from a base level to a laser low level or an energy level higher than the laser low level and a second semiconductor laser excitation light source having a wavelength different from that of the first excitation light source for exciting ion from a laser low level to a laser high level. For example, an amplification fiber uses a fluoro zircon ate glass as a base material. Two multiple wavelength couplers are disposed at the input side of the amplification fiber. The multiple wavelength couplers are connected to the first excitation light source and the second excitation light source, respectively.
    Type: Grant
    Filed: February 28, 2001
    Date of Patent: February 24, 2004
    Assignee: NEC Corporation
    Inventors: Tadashi Kasamatsu, Yutaka Yano
  • Patent number: 6628692
    Abstract: A laser crystal is formed on a substrate in a solid-state laser device. The laser crystal oscillates laser beam from a second end face when an excitation beam is projected to a first end face. An excitation beam emission element emitting the excitation beam is provided for the solid-state laser device. A waveguide path is formed on the substrate. The excitation beam is transmitted through the waveguide path. The waveguide path has a first end portion on which the excitation beam emitted by the excitation beam emission element impinges and a second end portion which opposes the first end face of the laser crystal. The excitation beam is emitted from the second end portion.
    Type: Grant
    Filed: April 30, 1999
    Date of Patent: September 30, 2003
    Assignee: NEC Corporation
    Inventor: Tadashi Kasamatsu