摘要:
A light detection device 1 comprises a photocathode 30 and an electron multiplier 50, which are positioned inside a vacuum container 10. A photomultiplier tube is arranged from these components. Light detection device 1 is equipped with an optical fiber 20, through which a light signal L flows, and photocathode 30 is formed on an end face 27 of optical fiber 20.
摘要:
Gelled colloidal crystals obtained by ultraviolet irradiation gelation means proposed so far in the art are inadequate in term of homogeneous gelation as far as their deep portions, and gelled colloidal crystals obtained by use of gelation means relying upon a light source in the visible light range in place of that ultraviolet irradiation has several problems such as difficulty with selection of polymerization initiators and generation of gas bubbles. The object of the invention is to provide a colloidal crystal gelled homogeneously to within, from which those problems are eliminated. To this end, a colloidal solution using an aqueous liquid as a disperse medium with a monomer or macromer added thereto and camphorquinone, riboflavin or their derivative contained therein as a polymerization initiator is irradiated with light having a wavelength component in the range of at least 400 nm to 500 nm for the purpose of gelation, thereby providing a solution to the aforesaid problems.
摘要:
An end face 7a of an optical fiber 7 and an end face 8a of an optical fiber 8 are arranged so as to have a predetermined interval and to oppose each other in a V-groove 23 of a base 21. A solution 27 including particles used as a material of the photonic crystal is dropped into a space section 25 which is formed by the end face 7a, the end face 8a, and the V-groove 23. Accordingly, by growing the photonic crystal from each of the end face 7a and the end face 8a, the optical control section including the photonic crystal 2 is formed on each of the end face 7a and the end face 8a.
摘要:
An insulated lattice is prepared with a plurality of lattice oriented atoms to create a substantially planar surface having a lattice arrangement. Any unsatisfied chemical bonds are terminated along the substantially planar surface by placing atoms at the site of the unsatisfied chemical bonds to terminate the unsatisfied chemical bonds and insulate the surface to form a platform. In one aspect of the invention, the insulator atoms are removed at predetermined locations. Atoms to form the atomic chain are placed at predetermined locations on the insulated lattice platform to form a first atomic chain which behaves as one of a conductor, a semiconductor and an insulator. A second atomic chain is also placed at predetermined locations on the insulated lattice platform so that the second chain behaves as another of a conductor, a semiconductor and an insulator. These placements are made such that the second atomic chain is electrically coupled to the first atomic chain, and the second atomic chain behaves differently than the first atomic chain. That is, in the first chain the atoms are placed at a first separation distance and in the second chain the atoms are placed at a second separation distance, where the second separation distance is different than the first.
摘要:
An insulated lattice is prepared with a plurality of lattice oriented atoms to create a substantially planar surface having a lattice arrangement. Any unsatisfied chemical bonds are terminated along the substantially planar surface by placing atoms at the site of the unsatisfied chemical bonds to terminate the unsatisfied chemical bonds and insulate the surface to form an insulated lattice platform. Atoms are placed at predetermined locations on the insulated lattice platform to form a first atomic chain which behaves as one of a conductor, a semiconductor and an insulator. A second chain of atoms is also placed at predetermined locations on the insulated lattice platform so that the second chain behaves as another of a conductor, a semiconductor and an insulator. These placements are made such that the second chain of atoms is electrically coupled to the first chain of atoms, and the second chain of atoms behaves differently than the first chain of atoms. That is, in the first chain the atoms are placed at a first separation distance and in the second chain the atoms are placed at a second separation distance, where the second separation distance is different than the first.
摘要:
A streak camera having improved time resolving capacity in the femtosecond regime. The streak camera uses magnetic and/or electric fields in such a way as to minimize the adverse effects of angular distribution and energy distribution of photoelectrons simultaneously emitted from a photocathode in response to the impinging of light thereon. In one embodiment, the streak camera comprises a streak camera tube including a housing, the housing having disposed therein a photocathode, an aperture sized to selectively permit the passage therethrough of substantially on-axis photoelectrons, an accelerating mesh, a pair of focusing electrodes or a cylindrical focusing electrode for focusing the photoelectrons into a beam, a pair of isolation plates or an isolation cylindrical, means for creating an electric field and/or a magnetic field, whereby the beam of photoelectrons passing therethrough is caused to be dispersed into a plurality of trajectories in accordance with the distribution of velocities of the photoelectrons, an aperture sized to selectively permit the passage therethrough of photoelectrons traveling along a narrow band of trajectories, i.e. photoelectrons within a narrow velocity range, a pair of sweep electrodes, a microchannel plate, and a phosphor screen. The streak camera also includes an input slit disposed in front of the photocathode and optics for imaging the input slit on the photocathode. To minimize dispersion of the optical pulse as it is focused onto the photocathode, the optics preferably include a mirror arrangement instead of a lens system.
摘要:
A spatial light modulation device includes a spatial light modulation tube and converts a one-dimensional photoelectron image into a two-dimensional electron image, rotating the two-dimensional electron image, subjecting the rotated two-dimensional electron image and a previously stored electron image to addition or subtraction, and stores the electron image thus processed. An image reconstructing apparatus includes: projection means for detecting as projection data a projection of internal information of an object; the spatial light modulation device which produces and stores a corrected reconstructed image on the basis of a one-dimensional correction data image and a previously stored reconstructed image; optical reading means for reading out the reconstructed image form the spatial light modulation device; summing means for integrating parts of the readout reconstructed image to produce sum data; and comparison and correction means for subjecting the projection data and the sum data to comparison to form the one-dimensional correction data image.
摘要:
A non-contacting revolving speed detecting apparatus for detecting the speed of rotation of a rotary body includes a diffraction plate that may be attached to the surface of the rotary body, a light source for radiating monochromatic laser light onto the diffraction plate, a light detector for detecting an output diffraction pattern of reflected and diffracted light from the diffraction plate, and circuitry for processing an output signal from the light detector means to detect and display the speed of rotation of the rotary body in either a digital or an analog manner.
摘要:
An apparatus for sampling, analyzing and displaying an electrical signal as disclosed having a good signal-to-noise ratio and high resolution. The apparatus includes a light pulse source for emitting a light pulse toward the electro-optical surface of a photoelectron sampling tube which in turn emits a photoelectron pulse after receiving the light pulse. The emitted photoelectron pulse is then modulated by a signal to be measured and is accelerated to an anode which may comprise a display for displaying the wave form of the electrical signal as a two-dimensional image.