Patent application number | Description | Published |
20080212621 | WAVELENGTH CONVERTER AND TWO-DIMENSIONAL IMAGE DISPLAY DEVICE - It is designed to prevent an efficiency reduction caused by the heat generation of a rare-earth doped fiber in a wavelength converter. | 09-04-2008 |
20080219302 | HARMONIC GENERATOR AND AN IMAGE DISPLAY DEVICE USING THE HARMONIC GENERATOR - It is aimed to suppress a local increase of an energy density per unit time in a nonlinear crystal. A fundamental wave emitted from a fundamental wave laser light source is condensed by a condenser lens and incident on a nonlinear crystal | 09-11-2008 |
20080225361 | Light Source Device, and Two-Dimensional Image Display Device - There is provided a light source device which can miniaturize a two-dimensional image display device as small as possible. The light source device is provided with three coherent light sources ( | 09-18-2008 |
20080232412 | Surface-Emitting Laser and Laser Projector - A surface emitting laser ( | 09-25-2008 |
20080297690 | LASER WAVELENGTH CONVERSION DEVICE, METHOD FOR FORMING POLARIZATION REVERSED STRUCTURE, AND IMAGE DISPLAY DEVICE - An object of the invention is to increase the beam diameter of a laser beam, and perform high-output wavelength conversion without causing crystal damage. A laser wavelength conversion device includes a laser wavelength conversion element for allowing incidence of a laser beam as a fundamental wave to convert a part of the fundamental wave laser beam into a wavelength-converted laser beam having a wavelength different from a wavelength of the fundamental wave laser beam. The laser wavelength conversion element includes a non-linear optical crystal having periodically polarization reversed portions. The polarization reversed portions are formed in such a manner that a region where a wavelength conversion efficiency is substantially uniform extends in a polarization direction of the non-linear optical crystal. The incident laser beam is converted into the wavelength-converted laser beam with the wavelength conversion efficiency. | 12-04-2008 |
20080315231 | LIGHT SOURCE, OPTICAL PICKUP, AND ELECTRONIC APPARATUS - A light source of the present invention includes: a semiconductor light emitting device which has a light emitting face and emits light from part of the light emitting face; a container which has a light transmitting window for transmitting the light and accommodates the semiconductor light emitting device; and a gettering portion for performing gettering of a material containing at least one of carbon and silicon. The gettering portion is positioned, in the container, in a region other than the part of the light emitting face of the semiconductor light emitting device. | 12-25-2008 |
20080316590 | SHORT WAVELENGTH LIGHT SOURCE - A short wavelength light source is provided with a fundamental wave light source for generating a fundamental wave, and a plurality of wavelength conversion elements made of nonlinear optical crystals having periodic polarization-inversion structures and adapted to convert a part of the fundamental wave into a second harmonic, and the nonlinear optical crystals of the plurality of wavelength conversion elements are different in material or composition. By converting the fundamental wave from the fundamental wave light source by the plurality of wavelength conversion elements, the generation of a thermal lens effect caused by light absorption can be suppressed to improve a high output resistance. | 12-25-2008 |
20090027764 | Wavelength Converting Element - A wavelength converting element which does not generate crystal destruction and output saturation of a second harmonic due to a third harmonic generated inside the element is provided. The wavelength converting element receives a fundamental wave which is light having a wavelength (lambda), outputs the second harmonic which is light having a wavelength (lambda/2), and has a crystal including at least one element selected from a group composed of Sc, Y, La, Ce, Pr, Eu, Gd, Ho, Yb, and Lu as an additive. | 01-29-2009 |
20090040596 | Short-Wavelength Light Source - A short wavelength light source of the present invention comprises a nonlinear crystal having a periodical polarization reversal structure. The polarization reversal structure of the nonlinear crystal is divided into a plurality of regions and the polarization reversal structure and the optical axis of the fundamental wave are inclined with different angles in the respective regions, so that higher harmonic generated is divided into a plurality of beams. By dividing the higher harmonic component into a plurality of beams, it is possible to reduce the power density of the higher harmonic and generate walk off in the fundamental wave and the higher harmonic, thereby to suppress generation of the sum frequency waves of the fundamental wave and the higher harmonic so as to enhance the tolerance to high output. Therefore, SFG generation is suppressed, and a high output power coherent light source is realized. | 02-12-2009 |
20090046749 | COHERENT LIGHT SOURCE - A coherent light source is provided with a light source unit for projecting a fundamental wave having a first wavelength, and a wavelength converting unit for projecting a second harmonic wave of the fundamental wave at a prescribed average power or more by receiving the fundamental wave. The coherent light source suppresses generation of sum frequency of the second harmonic wave and the fundamental wave, which causes unstable power. Therefore, a constitution is provided for keeping a walk-off angle of the fundamental wave and SFG light at 15 degrees or higher. | 02-19-2009 |
20090051827 | DISPLAY DEVICE - A display device ( | 02-26-2009 |
20090067453 | Laser Light Source and Optical Device - A laser light source is provided with a pump light source ( | 03-12-2009 |
20090067459 | ILLUMINATION LIGHT SOURCE DEVICE AND LASER PROJECTION DEVICE - An illumination light source is provided with a laser light source having a laser medium with a specified gain region, and a reflector having a narrow band reflection characteristic. A part of a laser light emitted from the laser light source is reflected and fed back by the reflector, so that an oscillation wavelength of the laser light source is fixed at a reflection wavelength. A peak of the gain region of the laser medium is shifted from the reflection wavelength by a change of an oscillation characteristic of the laser light source, so that the oscillation wavelength of the laser light source is changed from the reflection wavelength. Thus, an oscillation spectrum of the laser light source is spread to reduce speckle noise. | 03-12-2009 |
20090141753 | TWO-DIMENSIONAL IMAGE DISPLAY DEVICE - There has been a problem that interference noise called speckle noise occurs in a two-dimensional image display device using laser, and there is no applicable green light source although the speckle noise can be reduced by using a multi-wavelength light source. The present invention adopts a Yb-doped clad pump fiber ( | 06-04-2009 |
20090161700 | FIBER LASER - A fiber laser includes: a solid laser fiber doped with a rare earth element; a first grating fiber provided at one end portion of both ends along an optical axis direction of the solid laser fiber; and a first reflective element provided at the other end portion of the solid laser fiber. The first and second reflective elements constitute a resonator structure for the solid laser fiber; the first grating fiber Bragg-reflects only two polarizations of a first polarization having a first wavelength, and a second polarization having a second wavelength different from the first wavelength and being mutually orthogonal with the first polarization in a polarization direction; and at least one reflection wavelength of light which is reflected at the first reflective element and either one wavelength of the two polarizations which are Bragg-reflected at the first grating fiber coincide with each other. | 06-25-2009 |
20090161701 | LASER LIGHT SOURCE DEVICE AND IMAGE DISPLAY APPARATUS - There has been a problem that pumping light leaks from a part having a coating at the joint of a double-clad fiber added with a rare earth and a general single-mode fiber, and heat is generated partly from the fiber by this energy thus causing deterioration of the fiber. Deterioration of a fiber due to residual excitation light can be prevented by preventing residual excitation light in a double-clad fiber from exiting to a single-mode fiber, and the reliability is enhanced. Output of oscillation light can be increased because output of excitation light is not limited. Furthermore, a laser display having a high color reproducibility can be achieved by employing a light source combining a fiber laser light source and a wavelength conversion module. | 06-25-2009 |
20090207322 | PROJECTOR SYSTEM AND VIDEO PROJECTION METHOD - A projector system is provided with at least one projector mobile in a specified space and adapted to project a video to a projection area included in the specified space in accordance with inputted video information, a plurality of position sensors each including a position detecting section for detecting a positional relationship of the projector with the projection area and arranged in a specified positional relationship with the specified space, and a controller for controlling a video to be projected from the projector to the projection area based on detection results by the position detecting sections of the plurality of position sensors. | 08-20-2009 |
20090251766 | WAVELENGTH CONVERTER - When one tries to obtain high-output wavelength conversion light of class W, the internal temperature of a wavelength conversion element rises significantly to cause an undue variation in phase matching wavelength and thereby it is difficult to match the wavelength of a fundamental wave to the phase matching wavelength. A part of the output of the fundamental wave or pumping light propagating on a fiber is thereby absorbed by doping the fiber with a rare earth element at a set concentration, and the temperature of a fiber grating is raised by heating the fiber grating with heat produced through the absorption. Consequently, the wavelength of the fundamental wave obtained through the fiber grating by widening the grating interval is substantially matched to the phase matching wavelength which can be converted by the wavelength conversion element, and a wavelength converter ensuring a stable high output up to class W is provided. | 10-08-2009 |
20090257029 | IMAGE FORMING DEVICE - An image forming device which has a high reliability and forms an image without speckle noise is provided. | 10-15-2009 |
20090262262 | PROJECTION TYPE DISPLAY APPARATUS - A projection type display apparatus is provided that is safe even when a person looks directly into a laser beam. A laser operation control unit sets the output power of at least one laser source so that intensity A (mW/mm | 10-22-2009 |
20090279017 | WAVELENGTH CONVERSION MODULE, LASER LIGHT SOURCE DEVICE, TWO DIMENSIONAL IMAGE DISPLAY DEVICE, BACKLIGHT LIGHT SOURCE, LIQUID CRYSTAL DISPLAY DEVICE AND LASER PROCESSING DEVICE - A wavelength conversion module includes: a first fundamental wave propagation optical fiber for propagating a fundamental wave emitted from a laser light source; a first wavelength conversion element, optically connected to the first fundamental wave propagation optical fiber, for converting the fundamental wave emitted from the first fundamental wave propagation optical fiber into a harmonic wave; and a first harmonic propagation optical fiber, optically connected to the first wavelength conversion element, for propagating the harmonic wave emitted from the first wavelength conversion element, wherein the core diameter of the first harmonic propagation optical fiber is 0.5 to 0.9 times as large as the core diameter of first fundamental wave propagation optical fiber. | 11-12-2009 |
20090279573 | FIBER LASER AND OPTICAL DEVICE - A fiber laser and an optical device for controlling polarization and outputting single polarized light are provided in a simple structure. | 11-12-2009 |
20090303417 | SURFACE ILLUMINATOR AND LIQUID CRYSTAL DISPLAY USING SAME - The present invention provides a surface illuminator having a uniform luminance over a large area by using a laser light source, having a wide color reproduction range, and capable of suppressing a speckle noise, as well as a liquid crystal display using the same. The surface illuminator of the present invention includes the laser light source that emits a laser beam; a beam scan section that deflects and scans the laser beam; and a first plate-shaped light guide that makes the laser beam deflected and scanned by the beam scan section to be incident from an end face portion and making the incident laser beam to emit from a first major surface. Further, the liquid crystal display of the present invention includes a liquid crystal display panel and the surface illuminator, wherein the surface illuminator is used as a backlight illuminator that lights the liquid crystal display panel from backside in this liquid crystal display. | 12-10-2009 |
20090322985 | MULTI-PANEL TYPE LIQUID CRYSTAL DISPLAY DEVICE - There is provided a highly-reliable multi-panel LCD in which a plurality of liquid crystal display panel units having planar light source units disposed on their rear surfaces can be arranged in a flat plane or a curved plane, and a partial reduction in luminance or the like in a display device can be avoided. The multi-panel LCD comprises a plurality of liquid crystal display panel units ( | 12-31-2009 |
20100008388 | INTERNAL RESONATOR TYPE SHG LIGHT SOURCE - An internal resonator type SHG light source includes a pump light source which emits a pump light; a solid-state laser which absorbs the pump light and which emits a fundamental wave; an output mirror provided so as to face the solid-state laser, which forms a resonator together with the solid-state laser; a wavelength conversion element provided in the resonator, which converts the fundamental wave into a harmonic wave; a detector which detects a temperature of the wavelength conversion element; and a rotating unit which changes an incident angle of the fundamental wave on the wavelength conversion element by rotating the wavelength conversion element, wherein the rotating unit rotates the wavelength conversion element according to the temperature of the wavelength conversion element as detected by the detector. | 01-14-2010 |
20100020291 | 2-DIMENSIONAL IMAGE DISPLAY DEVICE, ILLUMINATION LIGHT SOURCE AND EXPOSURE ILLUMINATION DEVICE - A 2-dimensional beam scan unit ( | 01-28-2010 |
20100085631 | WAVELENGTH CONVERTER AND IMAGE DISPLAY WITH WAVELENGTH CONVERTER - Upon obtaining green light as wavelength converted light by causing infrared light to be incident on a wavelength conversion element, the absorption of the green light occurs due to the generation of ultraviolet light as sum-frequency light of the infrared light and the green light in the wavelength conversion element and the destruction of a crystal composing the wavelength conversion element occurs due to heat generated at this time. In a laser wavelength converter of the present invention, a condensed position of the infrared light in the wavelength conversion element is deviated from a position assumed to be optimal when the influence of the generated heat is ignored. Consequently, crystal destruction is suppressed, a high-efficiency wavelength conversion is enabled and high-output wavelength converted light exceeding several watts, which was difficult to attain in conventional wavelength conversion elements, is attained. | 04-08-2010 |
20100097674 | LIGHT SOURCE DEVICE, AND TWO-DIMENSIONAL IMAGE DISPLAY DEVICE - There is provided a light source device which can miniaturize a two-dimensional image display device as small as possible. The light source device is provided with three coherent light sources ( | 04-22-2010 |
20100103088 | SOLID-STATE LASER APPARATUS, DISPLAY APPARATUS AND WAVELENGTH CONVERTING ELEMENT - A solid-state laser apparatus includes: a semiconductor laser light source for emitting laser light; an optical resonator having a solid-state laser medium to be excited by incidence of the laser light to oscillate fundamental laser light, and a mirror; and a quasi phase matching wavelength converting element, disposed in the optical resonator, for converting a wavelength of the fundamental laser light, wherein the quasi phase matching wavelength converting element is formed with a polarization inversion region having a predetermined cycle, and the length of the polarization inversion region in an optical axis direction is 1.0 mm or less. | 04-29-2010 |
20100103347 | DISPLAY AND ILLUMINATOR - A display for illuminating a liquid crystal display panel with laser light of uniform light quantity distribution, and an illuminator for irradiating with laser light of uniform light quantity distribution are provided. | 04-29-2010 |
20100150186 | LASER LIGHT SOURCE AND DISPLAY DEVICE - According to the present invention, a laser light source comprises plural semiconductor lasers ( | 06-17-2010 |
20100165452 | WAVELENGTH CONVERSION ELEMENT, LASER LIGHT SOURCE, TWO-DIMENSIONAL IMAGE DISPLAY AND LASER PROCESSING SYSTEM - A wavelength conversion element is provided with a substrate including a nonlinear optical single crystal having a periodically poled structure, the visible light transmittance of the substrate is 85% or higher when ultraviolet light is irradiated to the substrate, and laser light having an average output of 1 W or more is outputted by shortening the wavelength of laser light having a wavelength of 640 nm to 2000 nm. By improving visible light transmission characteristics when the ultraviolet light is irradiated in this way, the breakdown of crystal can be prevented and the stabilization of output characteristics at high output can be realized. As a result, the absorption of green light induced by ultraviolet light can also be suppressed, and the saturation of output and the breakdown of crystal can be avoided. | 07-01-2010 |
20100165453 | SHORT WAVELENGTH LIGHT SOURCE AND LASER IMAGE FORMING APPARATUS - A short wavelength light source includes a wavelength conversion element having an incident surface, on which a fundamental wave is incident, and an output surface, from which a harmonic wave is outputted, the wavelength conversion element being provided for converting the fundamental wave into the harmonic wave; and a holder for holding said wavelength conversion element, wherein the wavelength conversion element has a specific region on the light output side, which is arranged so as to suppress variations in phase matching condition between the fundamental wave and the harmonic wave resulting from heat generated by absorbing the harmonic wave during a wavelength conversion. | 07-01-2010 |
20100231491 | LIGHT SOURCE DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE USING SUCH LIGHT SOURCE DEVICE - A light source device with high use efficiency is provided. By using a laser light source of a single polarization, uniformization of light quantity and uniformization of polarization are simultaneously realized, in a two-dimensional planar illumination utilizing reflection and collimating. Thus, it is possible to realize the two-dimensional planar illumination with polarization aligned, and therefore the use efficiency of light can be significantly improved, when combined with switching utilizing the polarization of a liquid crystal panel, etc. | 09-16-2010 |
20100246207 | LASER LIGHT SOURCE DEVICE, IMAGE DISPLAY AND ILLUMINATOR - There is a problem that in the connection portion between a rare-earth-doped double clad fiber and a single mode fiber, pumping light leaks in a portion having the coating, and the fiber generates heat partially with this energy and deteriorates. Also, there is another problem that the output is limited as the oscillation wavelength becomes shorter. Accordingly, in a laser light source device formed by combining a fiber laser and a fiber amplifier, by using the residual pumping light in the fiber laser as the pumping light in the fiber amplifier, it is possible to enhance the reliability by preventing the fiber deterioration caused by the residual pumping light. Further, by amplifying the output in the fiber amplifier in the latter stage without any limitation on the pumping light output, it is possible to increase an output of the oscillation light. | 09-30-2010 |
20100260213 | LASER LIGHT SOURCE DEVICE AND IMAGE DISPLAY DEVICE - The present invention concerns a laser light source device capable of multiwavelength oscillation. This laser light source device is provided with a laser light source; a laser cavity including a fiber, a first fiber grating provided at a side of the fiber toward the laser light source and having a plurality of reflection peaks, and a second fiber grating provided at a light emission end of the fiber and having a plurality of reflection peaks; a wavelength converter for converting a fundamental wave emitted from the laser cavity into a harmonic wave; a reflection wavelength varying unit capable of shifting the reflection wavelengths of the reflection peaks of the second fiber grating; and a controller for controlling phase matching conditions of the wavelength converter. Intervals between adjacent reflection peaks of the first fiber grating are different from those between adjacent reflection peaks of the second fiber grating. | 10-14-2010 |
20100290105 | WAVELENGTH CONVERTER AND IMAGE DISPLAY DEVICE - Since the absorption of a fundamental wave by a fiber increases if it is tried to obtain a wavelength conversion light of watt-class high output, the fiber length needs to be shortened. However, since oscillation efficiency conversely decreases if the fiber length is shortened, it is difficult to obtain a high-output fundamental wave. Thus, by reflecting an excitation light incident on the fiber in the fiber, the excitation light is efficiently absorbed to amplify the fundamental wave with a high gain. Further, by shortening the fiber length, the absorption of the fundamental wave is also reduced to improve a fundamental wave output. Consequently, a wavelength converter capable of ensuring a stable high output up to watt-class is achieved. | 11-18-2010 |
20100315574 | LIQUID CRYSTAL DISPLAY DEVICE - A compact liquid crystal display device is provided by connecting a plurality of liquid crystal display panel units each provided with a light guiding plate unit on a back side with a connection portion and supplying a laser light source via the connection portion. It includes a plurality of display portions formed of liquid crystal display panel units and light guiding plate units disposed in intimate contact with the back sides of the liquid crystal display panel units, a connection portion connecting a plurality of the display portions, and a laser light source. By supplying a laser beam emitted from the laser light source to the light guiding plate units via the connection portion, the display surfaces of the liquid crystal display panel units are illuminated by the laser beam. | 12-16-2010 |
20110292350 | 2-DIMENSIONAL IMAGE DISPLAY DEVICE, ILLUMINATION LIGHT SOURCE AND EXPOSURE ILLUMINATION DEVICE - A 2-dimensional beam scan unit reflects emission beams from a red laser light source, a green laser light source and a blue laser light source and scans in a 2-dimensional direction. Diffusion plates diffuse the respective light beams scanned in the 2-dimensional direction to introduce them to corresponding spatial light modulation elements. The respective spatial light modulation elements modulate the respective lights in accordance with video signals of the respective colors. A dichroic prism multiplexes the lights of the three colors after the modulation and introduces the multiplexed lights to a projection lens so that a color image is displayed on a screen. Since the 2-dimensional light emitted from the beam scan unit is diffused to illuminate the spatial light modulation element, it is possible to change the optical axis of the beam emerging from the light diffusion member for irradiating the spatial light modulation element moment by moment, thereby effectively suppressing speckle noise. | 12-01-2011 |
20120183006 | OPTICAL DEVICE, LASER BEAM SOURCE, LASER APPARATUS AND METHOD OF PRODUCING OPTICAL DEVICE - After forming domain inverted layers | 07-19-2012 |