Nonlinear Optical Crystals: A Complete Survey

A light source device includes: a light emitting plate that has a plurality of segment regions including a transmissive portion that transmits light and a reflective portion on which a fluorescent substance layer; a light source that irradiates the fluorescent substance layer of the light emitting plate with the excitation light; a dichroic mirror that is disposed between the light source and the light emitting plate to transmit the excitation light and reflect fluorescent light from fluorescent substances of the fluorescent substance layer; and an optical device that condenses the excitation light transmitted by the transmissive portion of the light emitting plate and the fluorescent light reflected by the dichroic mirror on a single optical path to form a condensed light and radiate the condensed light toward the same direction.

Light source device and projector

The mechanisms of short pulse laser interactions with a metal target are investigated in simulations performed with a model combining the molecular dynamics method with a continuum description of laser excitation, electron−phonon equilibration, and electron heat conduction. Three regimes of material response to laser irradiation are identified in simulations performed with a 1 ps laser pulse, which corresponds to the condition of stress confinement: melting and resolidification of a surface region of the target, photomechanical spallation of a single or multiple layers or droplets, and an explosive disintegration of an overheated surface layer (phase explosion). The processes of laser melting, spallation, and phase explosion are taking place on the same time scale and are closely intertwined with each other. The transition to the spallation regime results in a reduction of the melting zone and a sharp drop in the duration of the melting and resolidification cycle. The transition from spallation to phase e...

Atomistic Modeling of Short Pulse Laser Ablation of Metals: Connections between Melting, Spallation, and Phase Explosion†

An illumination device includes: a light source device adapted to emit an excitation light beam; and a rotating fluorescent plate having a single fluorescent layer adapted to convert a part or whole of the excitation light beam into a fluorescent light beam. The fluorescent light beam includes two or more colored light beams, and the single fluorescent layer is formed on a circular disk, which can be rotated by a motor, continuously along a circumferential direction of the circular disk.

Illumination device and projector

By doping an organic compound functioning as an electron donor (hereinafter referred to as donor molecules) into an organic compound layer contacting a cathode, donor levels can be formed between respective LUMO (lowest unoccupied molecular orbital) levels between the cathode and the organic compound layer, and therefore electrons can be injected from the cathode, and transmission of the injected electrons can be performed with good efficiency. Further, there are no problems such as excessive energy loss, deterioration of the organic compound layer itself, and the like accompanying electron movement, and therefore an increase in the electron injecting characteristics and a decrease in the driver voltage can both be achieved without depending on the work function of the cathode material.

Light Emitting Device

A light source apparatus includes: an excitation light source including a laser light source; a first wheel that is controlled to rotate, and includes, in a part of a surface thereof to be illuminated by excitation light emitted from the excitation light source, a phosphor layer to be excited by the excitation light; a dichroic mirror that guides fluorescence emitted from the phosphor layer of the first wheel and the excitation light to an illumination optical system; and a second wheel that is controlled to rotate, and includes a dichroic filter that transmits light having a desired wavelength component of each of the fluorescence and the excitation light output from the dichroic mirror.

Light source apparatus and image display apparatus using the same

PROBLEM TO BE SOLVED: To provide a light source device which efficiently condenses light from a large number of solid light sources and has high spectrum utilization rate of emission obtained by exciting a fluorescent substance.SOLUTION: The light source device includes: a solid light source unit 1 including a solid light source 5 which emits blue color light and a condenser lens 7; a dichroic mirror 2 which polarizes and separates the color light into a first polarization component and a second polarization component; a fluorescent emission plate 3 which is excited by the light having the first polarization component to emit fluorescence of green and red components and makes the fluorescence to be incident to the dichroic mirror; a first retardation plate 18 which transforms polarization having the second polarization component into circular polarization; and a reflector plate which reflects light transmitted through the first retardation plate to make the light to be incident to the first retardation plate again, in which the dichroic mirror synthesizes color light from the fluorescent emission plate and color light having transmitted through the first retardation plate again and emits white light. The light source device also includes a second retardation plate 12 which changes a polarization direction of light from the solid light source unit and controls light having P polarization component and S polarization component, which is made incident to the dichroic mirror, to a fixed ratio.

Light source device and projection type display device

For a lighting device for obtaining output light in the wavelengths of light of three colors of red, green, and blue, a lighting device using a semiconductor laser for the blue light has been proposed. When using this lighting device in an image display device, etc., there are problems in blue color rendering properties and reduced image quality due to speckle noise. A light source device designed to emit red light, green light, a first blue light, and a second blue light, the light source device including: a red solid-state light source; a green solid-state light source; a semiconductor laser for emitting the first blue light; and a blue light generation part for emitting the second blue light, wherein the main component of the second blue light is light in a wavelength range of wavelengths longer than that of the first blue light.

Light source device, lighting device and image display device using such light device

A lighting device configured to output light of predetermined color includes: a plurality of solid-state light sources including at least a first solid-state light source and a second solid-state light source; a drive section configured to drive each of the plurality of solid-state light sources individually; a first phosphor for excitation by first emission light emitted from the first solid-state light source; and a second phosphor for excitation by second emission light emitted from the second solid-state light source, and first fluorescence and second fluorescence are of different color.

Lighting Device and Projection-Type Display Apparatus Including Lighting Device

PROBLEM TO BE SOLVED: To provide a light source device capable of more efficiently extracting and transmitting fluorescence emitted from a phosphor layer due to exposure to an excitation light than a small and simple optical system.SOLUTION: A light source device comprises: a phosphor layer 3 configured by arranging a phosphor on a surface of a substrate 2; and an excitation light source 5 for exciting the phosphor. A dichroic mirror 7 is arranged between the phosphor layer and the excitation light source in a manner leaning toward a travelling direction of an excitation light from the excitation light source, and it is configured so that an incident area of the excitation light output from the excitation light source and an output area of fluorescence emitted from the phosphor belong to a space on the same side, to a plane where the phosphor is arranged. The dichroic mirror has such spectral characteristics as transmitting 50% or more of P-polarized light and reflecting 50% or more of S-polarized light in a dominant wavelength of the excitation light.

Hiroshi Kitano

Papers

Light source apparatus and image display apparatus using the same

Light source device and projection type display device

Light source device, lighting device and image display device using such light device

Lighting Device and Projection-Type Display Apparatus Including Lighting Device

Light source device and image display