Hamamatsu-photonics K.k.

Haruyasu Ito

Takashi Inoue

Naoya Matsumoto

Norihiro Fukuchi

Shinichiro Aoshima

Yuu Takiguchi

Koyo Watanabe

Takashi Yasuda

Koji Takahashi

Taro Ando

Yoshiyuki Ohtake

Yutaka Tsuchiya

Hironori Takahashi

Koei Yamamoto

Yasunori Igasaki

Yoichi Kawada

Junji Okuma

Masatoshi Fujimoto

Yasushi Ohbayashi

Shigeru Sakamoto

Shingo Oishi

Toshiharu Moriguchi

An imaging system includes a light source for outputting initial pulsed light, a polarization control unit for rotating a polarization plane of the initial pulsed light, an optical pulse shaping unit for inputting the initial pulsed light with the rotated polarization plane, and outputting first pulsed light Lphaving a first polarization direction and second pulsed light Lphaving a second polarization direction different from the first polarization direction with a time, an irradiation optical system for irradiating an imaging object with the pulsed light Lpand the pulsed light Lp, a light separation element for separating the pulsed light Lpand the pulsed light Lpreflected by or transmitted through the imaging object on the basis of the polarization directions, an imaging unit for imaging the pulsed light Lp, and an imaging unit for imaging the pulsed light Lp.

Imaging system and imaging method

In a waveform measurement method, first, initial pulsed light is spatially dispersed for respective wavelengths. Next, the initial pulsed light is input to a polarization dependent type SLM in a state where a polarization plane is inclined with respect to a modulation axis direction, and a phase spectrum of a first polarization component of the initial pulsed light along the modulation axis direction is modulated, to cause a time difference between first pulsed light Lpincluding the first polarization component and second pulsed light Lpincluding a second polarization component orthogonal to the first polarization component. After combining the wavelength components, an object is irradiated with the pulsed light Lpand the pulsed light Lp, and light generated in the object is detected. The above detection operation is performed while changing the time difference, and a temporal waveform of the pulsed light Lpis obtained.

Pulsed light waveform measurement method and waveform measurement device

An autocorrelation measurement device includes a first reflection member, a second reflection member, a focusing unit, a nonlinear optical crystal, a detection unit, a filter, an aperture, a delay adjusting unit, and an analysis unit. Incident pulsed light is transmitted through the second reflection member and incident on the first reflection member. First pulsed light reflected on a first reflection surface of the first reflection member and a second reflection surface of the second reflection member and second pulsed light reflected on a second reflection surface of the first reflection member and a first reflection surface of the second reflection member are incident on the nonlinear optical crystal via the focusing unit. Second harmonic light generated in the nonlinear optical crystal is detected by the detection unit.

Autocorrelation measurement device

In an aberration-correcting method according to an embodiment of the present invention, in an aberration-correcting method for a laser irradiation devicewhich focuses a laser beam on the inside of a transparent medium, aberration of a laser beam is corrected so that a focal point of the laser beam is positioned within a range of aberration occurring inside the medium. This aberration range is not less than n&#xd7;d and not more than n&#xd7;d+&#x394;s from an incidence plane of the medium, provided that the refractive index of the mediumis defined as n, a depth from an incidence plane of the mediumto the focus of the lensis defined as d, and aberration caused by the mediumis defined as &#x394;s.

Aberration-correction method, laser processing method using said aberration-correcting method, laser irradiation method using said aberration-correcting method, aberration-correcting device and aberration-correcting program

Aberration-correcting method, laser processing method using said aberration-correcting method, laser irradiation method using said aberration-correcting method, aberration-correcting device and aberration-correcting program

Aberration-correcting method, laser processing method using said aberration-correcting method, laser irradiation method using said aberration-correction method, aberration-correction device and aberration-correcting program

A method for designing an optical component for shaping laser light according to one embodiment of this invention measures the intensity distribution of an incident laser light, obtains the shapes in the short and long axial directions of a pair of aspheric lenses for each of the short and long axial directions of the incident laser light from the measured intensity distribution of the incident laser light and a desired intensity distribution, performs approximation of a high-order polynomial of the shapes in the short and long axial directions of the pair of aspheric lenses, corrects the high-order polynomials for the short or long axial directions using a correction factor, and obtains the shapes of the pair of aspheric lenses on the basis of the corrected high-order polynomials.

Method for designing laser-light-shaping optical component, method for producing laser-light-shaping optical component, and laser-light-shaping optical system

A light modulating device (A) comprises a reflective SLM () for modulating a laser beam (Lr) entering along a first optical path extending in a first direction; a dielectric multilayer film mirror (), formed on a light transmitting member () transparent to illumination light (Li), for reflecting the laser beam (Lr) incident on a front face thereof from the reflective SLM () onto a second optical path extending in a second direction intersecting the first direction, and transmitting the illumination light (Li) incident on a rear face thereof onto the second optical path; and a light collecting lens () for receiving the illumination light (Li) and laser beam (Lr) from the dielectric multilayer film mirror () and converging the illumination light (Li) and laser beam (Lr).

Light modulating device and laser processing device

The present invention provides an optical amplifying device which can be easily downsized, increased in output, and stabilized. An optical amplifying deviceA includes an optical amplifierA and an energy supplier. The optical amplifierA includes an optical amplifying mediumand a transparent medium. The energy suppliersupplies excitation energy (for example, excitation light) to the optical amplifying medium. The optical amplifying mediumis supplied with the excitation light to amplify light and output it. To-be-amplified light passes through the transparent mediumin the optical amplifying mediuma plurality of times. The transparent mediumcan propagate the to-be-amplified light, for example, zigzag inside.

Optical amplifying device

A laser processing device includes a laser light source, a spatial light modulator, a control section, and a condensing optical system. The spatial light modulator, presents a hologram for modulating the phase of the laser light in each of a plurality of two-dimensionally arrayed pixels, and outputs the phase-modulated laser light. The control section causes a part of the phase-modulated laser light (incident light) to be condensed at a condensing position in a processing region as a laser light (contribution light) having a constant energy not less than a predetermined threshold X. The control section causes a laser light (unnecessary light) other than the contribution light condensed to the condensing position existing in the processing region to be dispersed and condensed at a condensing position existing in a non-processing region as a plurality of laser lights (non-contribution lights) having an energy less than the predetermined threshold.

Laser processing device and laser processing method

A laser light shaping and wavefront controlling optical systemin accordance with an embodiment of the present invention comprises an intensity conversion lensfor converting and shaping an intensity distribution of laser light incident thereon into a desirable intensity distribution; an optical modulation devicefor modulating the laser light emitted from the intensity conversion lensso as to control a wavefront thereof; a condenser optical systemfor converging the laser light issued from the optical modulation device; and an image-forming optical system, arranged between the optical modulation deviceand the condenser optical system, having an entrance-side imaging plane between a planewhere the laser light emitted from the intensity conversion lensattains the desirable intensity distribution and a modulation planeof the optical modulation deviceand an exit-side imaging plane on a pupil planeof the condenser optical system

Optical system for laser optical rectification and wave front control

A light irradiation device and method for irradiating converged light with an object include a light source configured to output a light, a phase-modulating spatial light modulator, a controller, and a converging optical system. The phase-modulating spatial light modulator is configured to input the light outputted from the light source and to display a hologram modulating a phase of the light at each of a plurality of pixels arranged two-dimensionally, and outputs the phase-modulated light. The controller is configured to cause the spatial light modulator to display a hologram such that the light outputted from the spatial light modulator is converged at a plurality of converging positions. The controller causes the spatial light modulator to display a first hologram and performs a feedback of the first hologram so as to modify the first hologram. The modifying of the first hologram is performed by measuring intensity of the light converged.

Light irradiation device and light irradiation method irradiating converged light with an object

A laser machining deviceincludes a laser light source, a spatial light modulator, a controller, a converging optical system, and a shielding member. The phase-modulating spatial light modulatorinputs a laser beam outputted from the laser light source, displays a hologram modulating a phase of the laser beam at each of a plurality of pixels arranged two-dimensionally, and outputs the phase-modulated laser beam. The controllercauses the spatial light modulatorto display a plurality of holograms sequentially, lets the converging optical systemconverge the laser beam outputted from the spatial light modulatorat converging positions having a fixed number of M, selectively places N converging positions out of the M converging positions into a machining region, and machines an object to be machined

Laser machining device with a converged laser beam and laser machining method

A laser light sourceis provided with a first reflection mirror, a laser medium, an aperture, an output mirror, a half mirror, a light beam diameter adjuster, and a second reflection mirror, and outputs laser oscillation lightreflected by the half mirrorto the outside. The main resonator is composed by the first reflection mirrorand the output mirrordisposed so as to be opposed to each other with the laser mediumplaced therebetween. The external resonator is composed by the output mirrorand the second reflection mirrordisposed so as to be opposed to each other. The second reflection mirroris configured such that it gives amplitude or phase variations to respective positions in the section of a light beam when the light is reflected, the second reflection mirror presents an amplitude or phase variation distribution, and determines the transverse mode of the laser oscillation lightbased on the amplitude or phase variation distribution. Thus, a laser light source capable of easily controlling the transverse mode of the laser oscillation light can be realized.

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Hamamatsu, Japan

Haruyasu Ito