Sony Corporation

Other

Michio Oka

Hiroshi Yoshida

Shigeo Kubota

Naoya Eguchi

Hiroyuki Wada

Kaoru Kimura

Hiroshi Suganuma

Kenji Tanaka

Atsushi Fukumoto

Kenji Kondo

Hiroki Kikuchi

Yushi Kaneda

Goro Fujita

Kiyoshi Ohsato

Minoru Takeda

Fumisada Maeda

Hisashi Masuda

Akio Furukawa

Yuki Maeda

Minehiro Tonosaki

Nobuhiko Umezu

Yutaka Imai

Koichi Tatsuki

Mitsunori Ueda

Tohru Ogawa

Shigeki Hashimoto

Suehiro Nakamura

Asif A Godil

Yuushi Kaneda

There is provided a laser emitting apparatus including a semiconductor laser, a grating positioned relative to the semiconductor laser to form a resonator structure therebetween, and an optical system positioned between the semiconductor laser and the grating. The optical system is configured and arranged so that confocal points are formed on both a light emitting surface of the semiconductor laser and a reflection surface of the grating.

Laser emitting apparatus and master oscillator power amplifier system

There is provided a pulse shaping device including a pulse generator configured to generate pulsed light by using a semiconductor laser for emitting light of a predetermined wavelength, and an optical member provided in a subsequent stage of the pulse generator and configured to compress a pulse time width of the pulsed light. The pulsed light has a first frequency dispersion state. The optical member imparts a second frequency dispersion state to the pulsed light, the second frequency dispersion state being a frequency dispersion state opposite to the first frequency dispersion state.

Pulse shaping device and pulse shaping method

A light source device configured as a master oscillator power amplifier includes a mode locked laser unit having an external resonator and a semiconductor optical amplifier that amplifies and modulates laser light emitted from the mode locked laser unit. The width in a lateral direction of a waveguide on an incident side of the semiconductor optical amplifier is set so that a horizontal lateral mode of the waveguide on the incident side of the semiconductor optical amplifier becomes multiple modes, and a magnification conversion unit that converts a magnification of incident light from the mode locked laser unit to the semiconductor optical amplifier is disposed so that a basic mode is selectively excited in optical coupling on the incident side of the semiconductor optical amplifier.

Light source device, optical pickup, and recording device

A laser device, includes: a fundamental wave generating portion configured to generate a plurality of fundamental waves having wavelengths which are different from each other in at least one set thereof, the fundamental wave generating portion having a semiconductor laser having a plurality of luminous points, and a Bragg reflection structure; and a nonlinear optical element in which a poling structure adapted to pseudophase matching for the wavelengths of the plurality of fundamental waves emitted from the fundamental wave generating portion, respectively, is formed variatively along a propagating direction of the plurality of fundamental waves.

Laser device, laser display apparatus, laser radiating apparatus, and nonlinear optical element

A laser light source device includes a pump light source which emits transverse-multimode light; a plurality of resonator mirrors which define a resonator, at least part of the resonator mirrors outputting light to the outside, where the output light having plural wavelengths; a laser medium arranged in the resonator, the laser medium being pumped with the transverse-multimode light emitted from the pump light source; and a wavelength conversion element arranged in the resonator, the wavelength conversion element being irradiated with a transverse-multimode line beam of fundamental wave obtained by oscillation at the laser medium and outputting a line beam of converted wave.

Laser light source device and laser irradiation apparatus using the same

Disclosed is a laser light source apparatus. The laser light source apparatus includes a pumping light source and a pair of resonator mirrors. In the laser light source apparatus, the pumping light source includes at least a laser medium and a wavelength conversion element, and the laser medium is pumped by light having a multi-transversal mode pattern and the wavelength conversion element are irradiated with a line beam of fundamental wave obtained by the oscillation by the laser medium to output a line beam of converted wave. The laser light source apparatus further includes at least one reflector bending light path is provided in the resonator such that a longitudinal direction of the line beam of fundamental wave is approximately perpendicular to an incident plane of the reflection unit.

Laser light source apparatus and image generating apparatus using such laser light source apparatus

Disclosed is a laser light source apparatus including an excitation light source, a pair of resonator mirrors, and a resonator including the excitation light source and the pair of resonator mirrors. In the laser light source apparatus, one of two higher harmonic waves generated from the wavelength conversion element is output to the outside of the resonator, is returned to the wavelength conversion element by the retroreflection unit, the higher harmonic wave returned by the retroreflection unit is spatially displaced, is superposed on the other higher harmonic wave generated from the wavelength conversion element, and is output to the outside.

Laser light source apparatus and image generating apparatus using laser light source apparatus

A one-dimensional transverse multiple mode laser is used for a one-dimensional illumination apparatus. A pumping light source, and a laser medium and a wavelength conversion device (nonlinear optical crystal or a nonlinear optical device) which are disposed in a resonator, are provided, and the nonlinear optical crystal or a nonlinear optical device is irradiated with a line beam obtained by exciting the laser medium in an elliptic transverse mode pattern. Then, a one-dimensional light modulation device is irradiated with the wavelength-converted line beam, and scanning with the beam modulated by the modulation device is conducted to produce a two-dimensional image. For example, in a green illumination optical system, in the case where the nonlinear optical device for obtaining visible rays through second harmonic generation from IR rays oscillated by a solid state laser medium has a periodical poling structure, stoichiometric composition periodical poling lithium tantalate having been subjected to vapor transport equilibration is used, whereby reliability is enhanced and a reduction in cost can be achieved through mass production.

One-dimensional illumination apparatus and imaging apparatus

Speckle noise is reduced to increase image quality in an image display apparatus such as a projection display or the like. An illuminating optical device in an image display apparatus () applies a laser beam L to a GLV (spatial modulator) () and modulates the laser beam based on an image signal input to the GLV to display an image. A plurality of laser beams (. . . ) each having an optical path difference greater than the coherence length of the laser beam are applied to the GLV.

Illuminating optical device in image display device and image display device

An image display unit includes a linear display device. The linear display device is line-scanned to display a two-dimensional image. The linear display device has a video signal protection function. In the linear display device, video protection can be implemented using a very simple system for turning off some pixels. Device ID information can be embedded into a display terminal using the image display unit.

Image display unit and display terminal using the same

A laser apparatus includes a master laser for emitting reference laser pulse light RPref having a wavelength of 914 nm and a pulse width of 0.5 ns; a microlens array for dividing the reference laser pulse light RPref into N pieces of light; optical fiber amplifiers - to -N being set to increase their length progressively in that order so as to have a propagation delay time of 0.5 ns, which is the pulse width of the divided pieces of reference laser pulse light DRPref to DRPrefN; a third harmonic generating unit for receiving the divided pieces of reference laser pulse light on which amplifying and delaying effects have been produced, and generating third harmonics TRD to TRDN having a wavelength of 305 nm and a pulse width of 0.5 ns; and an illuminating optical system for successively disposing the N third harmonics TRD to TRDN in parallel with each other, subjecting the N third harmonics TRD to TRDN to time multiplexing, and emitting the result.

Laser apparatus

An ultraviolet optical device includes optical parts on which an ultraviolet ray is irradiated. Some or all of the optical parts are arranged in an envelope having a gas inlet port and a gas output port. In the envelope ( ), a dry gas having an amount of moisture (as volume fraction) of 5,000 &lsqb;ppm&rsqb; or less and led from the gas inlet port ( ) is sprayed on an optical part in which at least a deterioration in optical characteristics is especially a problem, so that an improvement in the secular change of the optical part can be achieved.

Ultraviolet optical device having an optical part with a gas sprayed thereon

A laser beam in the ultraviolet region is generated at high power for along period. A green laser beam generated by a laser oscillator comes incident into a resonator from behind a first curved mirror, and circulates there, reflected by each mirror. By passing a barium borate crystal, it causes a secondary harmonic (a laser beam in the ultraviolet region) to be generated, which is taken out of the resonator via a second curved mirror. The beam waist of the laser beam passing the barium borate crystal is set to 46 &mgr;m, about double the conventional thickness, by adjusting the distance between the first curved mirror and a second flat mirror. As a result, the power density of the laser beam in the barium borate crystal is reduced to &frac14; of the value according to the related art, and it is made possible to avoid rapid degradation of the barium borate crystal by excessive squeezing of the laser beam.

Laser beam generating apparatus

A measurement method and a measurement apparatus for measuring the structure of a micro-structure or the structure along the depth of an object for measurement. The laser light from a solid-state laser light source is subjected to wavelength conversion to generate the ultraviolet laser light, and measurement is made of the object for measurement by heterodyne detection or homodyne detection employing the ultraviolet laser light. This enables measurement of a structure of a micro-structure. Alternatively, the laser light is split into multiple laser light beams and frequency shifted so that the laser light beams will be of different frequencies. The laser light beams are imaged at respective different focal point positions to perform heterodyne detection. The resulting heterodyne signals are separated into respective frequency bands and measurement is made of the structure of the object for measurement in association with the respective imaging points. This enables measurement of the structure of the object for measurement in the direction along its depth.

Measurement method and apparatus

In an optical system having at least one optical part other than mirrors, for example, a wavelength conversion optical system which uses an external resonator, an optical system which is capable of solving the problem of transverse mode generation due to the existence of scattering matter and the optical crystal used and capable of supplying a stable output (stable wavelength conversion output) is provided. At least at one point in a stable resonator having optical parts (optical crystal) other than mirrors, an aperture having a circular hole with a diameter 1 to 10 times the diameter of a beam at the aperture, a slit having a width 1 to 10 times the diameter of the beam, or an aperture of an arbitrary shape having an edge is located, or a knife edge having an linear or curved edge is Located so that the nearest distance between the edge and the beam is 1 to 10 times the radius of the beam from the center of the beam.

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Kanagawa, Japan

Michio Oka