Abstract: For performing hologram recording or reproduction, an oscillation wavelength half value width ?? of a coherent light source satisfies a relationship of ??<?2/(S×2 sin ?), where a substantial hologram size is S, a substantial cross angle between reference light and signal light is ?, and the oscillation wavelength of the coherent light source is ?. Even when stray light is generated, the coherent light source can suppress generation of an unnecessary interference fringe due to the stray light, and stably record and reproduce holograms.

Abstract: An image pickup device comprising visible color optimization under received near-infrared and infrared light conditions is disclosed. Color signals corresponding to light received through each of a plurality of color filters are processed to determine a near-infrared and infrared light energy contribution. The color signals are processed to optimize color of received images.

Abstract: A laser image display comprising a laser light source emitting laser light, a beam deflector element for receiving laser light and deflecting its advancing direction, a beam deflecting element control section for controlling the degree of deflection performed by the beam deflector element, an optical integrator for receiving and guiding the deflected laser light to output from its outputting end face, a pseudo surface light source element for scattering the deflected laser light, and a modulation element for receiving and modulating the laser light scattered by the false surface light source element.

Abstract: Provided are an imaging device and an imaging method which can realize an appropriate modulation pattern in accordance with a zoom position without requiring a modulation element switching mechanism in a depth extension optical system. The imaging device has: a zoom optical system 110 including an optical wavefront modulation element 114 which has an optical wavefront modulation function and can adjust the optical wavefront modulation pattern; an imaging element 120 for capturing an object image which has passed through the zoom optical system; a modulation function (pattern) control unit 200 which controls the optical wavefront modulation pattern of the optical wavefront modulation element; and an image processing part 140 which applies a predetermined processing on an image signal of the object from the imaging element 120. The zoom optical system 110 is a lens-moving type for moving a lens in the optical axis direction.

Abstract: A lens unit using an aberration control module is disclosed. The lens unit can be operable to intentionally produce aberration. In the lens unit, a point-spread-function of a light beam passing through the lens unit becomes substantially circular.

Abstract: An optical system comprising an aberration control optical system is disclosed. An aberration control optical system is operable to produce an image aberration, and an aperture stop is operable to limit a light beam passing through the aberration control optical system. An image pickup device is operable to capture an object image passing through the aberration control optical system, and the aberration control optical system provides inflection points within a diameter of the aperture stop to obtain a depth extending effect.

Abstract: An image processing method and apparatus operable for processing images is disclosed. The image processing method allows for drawing any given image in an output image on which various types of image processing have been performed. Such various types of image processing are, for example, correction of an image having distortion due to the distortion aberration of an imaging lens, an image having unnatural perspective distortion of a subject due to high-angle or overhead photography, generation of an output image with the viewpoint changed from the viewpoint of a captured image, mirror-image conversion of a captured image, and electronic zooming. Embodiments of the present invention also relate to an imaging apparatus that uses the image processing method.

Abstract: Disclosed is an arrangement that enables to keep a relative positional relation between a beam for servo control and a beam for information recording/reproduction constant concerning focusing control and tracking control, even if the two beams are different from each other. An optical storage medium has a reflection surface for reflecting a first beam having a first wavelength, and reflecting a second beam having a second wavelength different from the first wavelength; and an information storage layer for recording information as an interference pattern by incidence of the first beam, or reproducing the information from a wave surface based on the interference pattern. The reflection surface is formed with plural marks or guide grooves usable in a tracking operation or a focusing operation by irradiation of the second beam.

Abstract: A hologram recording medium has a substrate and a hologram recording layer into or from which information is recorded or reproduced by a hologram, and a concavo-convex pattern having a reflection layer that transmits hologram recording/reproducing light and reflects light having a longer wavelength than the hologram recording/reproducing light is formed inside the hologram recording medium.

Abstract: The present invention relates to a method for laminating substrates, including locating positioning a surface of a first substrate and a surface of a second substrate at positions close to each other, or partially bringing them in partial contact with each other; supplying a volatile liquid between the surface of the first substrate and the surface of the second substrate; and evaporating the volatile liquid so as to laminate the substrates with each other.

Abstract: A laser light source includes a fundamental laser generator that generates a fundamental laser light, a wavelength conversion element that is made of a ferroelectric crystal with a periodically poled structure and converts the fundamental laser light to a laser light having a different wavelength, a holding member that holds at least a part of an element surface of the wavelength conversion element that crosses a polarization direction of the periodically poled structure, and an insulation layer that is provided between the holding member and the element surface. Electric resistivity of the insulation layer is 1×108 ?·cm or higher.

Abstract: An information recording/reproducing device irradiates a signal light beam containing arbitrary two-dimensional information and a reference beam emitted from the same light source as the signal light beam to an arbitrary region of a hologram recording medium to record a first hologram. After the first hologram is recorded, the device changes the incident angle of the signal light beam with respect to the hologram recording medium and multiplex-records a second hologram, which is different from the first hologram, in the same region as the region in which the first hologram is recorded by irradiating a signal light beam whose incident angle has been changed and a reference beam substantially the same as the reference beam used when recording the first hologram while the device obtains at least a part of a diffracted beam from the first hologram simultaneously.

Abstract: A laser light source (10) has semiconductor lasers (1) and a waveguide tube (3) for propagating emission light from each of the semiconductor lasers (1). The semiconductor lasers are arranged on the upper end on the incident surface (31) side of the waveguide tube such that the emission light (4) from each of the semiconductor lasers enters into the waveguide tube from one end surface (31) of the waveguide tube and exits from the other end surface (32) of the waveguide tube. The structure can realize a small-sized laser light source having high output and capable of outputting emission light having uniform emission light intensity distribution.

Abstract: An optical element is provided that includes a base substrate, a waveguide substrate, and a thin film layer that is provided between the base substrate and the waveguide substrate and that has a single-layer structure of a multilayer structure including a film containing Ta2O5 or Nb2O5 as a principal component.

Abstract: A laser image display device and a laser image display screen used for the laser image display device. The laser image display device is provided with a laser light source for emitting laser beams and a laser image display screen (10) for projecting the laser beams. The laser image display screen (10) is provided with a reflection scattering body (11) for scatter reflecting the laser beams, and a semi-transmissive diffusion layer (12) arranged substantially parallel to the reflection scattering body (11). The semi-transmissive diffusion layer (12) reflects at least a part of the laser beams, transmits the rest, diffuses the transmitting laser beams and projects them.

Abstract: An optical element (10) according to the present invention is provided with a plurality of waveguides (11)˜(13) and a plurality of light path coupling parts (21), (22) coupling adjacent waveguides so as to optically couple said plural waveguides serially, wherein the paths for transmitting lights through the plural waveguides are curved at the optical path coupling parts, thereby the optical elements which is converted the incident laser light into the emitted light having uniform cross-sectional light intensity distribution can give a compact structure, further a laser light source that employs the optical element, and a two-dimensional image forming apparatus that employs the laser light source can also give a compact structure.

Abstract: For performing hologram recording or reproduction, an oscillation wavelength half value width ?? of a coherent light source 21 satisfies a relationship of ??<?2/(S×2 sin ?), when a substantial hologram size is S, a substantial cross angle between reference light and signal light is ?, and the oscillation wavelength of the coherent light source is ?. Even when stray light is generated, the coherent light source 21 can suppress generation of an unnecessary interference fringe due to the stray light, and stably record and reproduce holograms.

Abstract: A multiplexed holographic recording apparatus of the present invention records multiplexed holograms in a plurality of recording regions that are formed on a holographic recording medium. In particular, the apparatus first records a predetermined number of multiplexed holograms in each of the recording regions formed in a predetermined range or an overall range of the holographic recording medium through holographic recording performed N times, and then performs the (N+1)th holographic recording in each recording region formed in the predetermined range or the overall range. When n other recording regions (where n=0, 1, 2, . . . ) are superimposed on each recording region formed on the holographic recording medium, a difference in the degree of multiplexing between the recording regions formed in the predetermined range or the overall range of the holographic recording medium does not exceed a predetermined value of n+1.

Abstract: 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.

Abstract: There is provided a stable optical element having a fine, uniform, and wide-ranging domain inversion structure in a ferroelectric crystal. This includes a plurality of domain inversions (101) formed on an MgO:LiNbO3 substrate (100), and a groove (102) formed on the substrate surface between the domain inversions (101). The depth T? of substantially all of the domain inversions (101) satisfies the relation T?<T with respect to the substrate thickness T.