Abstract:
A method and apparatus use a photonic-crystal fiber having a very large core while maintaining a single transverse mode. In some fiber lasers and amplifiers having large cores problems exist related to energy being generated at multiple-modes (i.e., polygamy), and of mode hopping (i.e., promiscuity) due to limited control of energy levels and fluctuations. The problems of multiple-modes and mode hopping result from the use of large-diameter waveguides, and are addressed by the invention. This is especially true in lasers using large amounts of energy (i.e., lasers in the one-megawatt or more range). By using multiple small waveguides in parallel, large amounts of energy can be passed through a laser, but with better control such that the aforementioned problems can be reduced. An additional advantage is that the polarization of the light can be maintained better than by using a single fiber core.
Abstract:
Solid body for the production of solid-state lasers, the solid body having, at least in an optically used area, monoclinic elementary cells based on the same crystallographic system of coordinates, and having in the optically used area at least two domains with different chemical compositions, the optically used area having at least one active zone and at least one non-active zone. At least in the optically used area, at least one of tungstenate, potassium, and rubidium may be a constituent of the monoclinic elementary cells. At least in the optically used area, at least one of Y, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu may be a constituent of the monoclinic elementary cells. Solid body is suited for a device for generating coherent electromagnetic radiation, such as a laser beam. The solid body may be used as a disk or chip laser.
Abstract:
A system for generating a powerful laser beam includes a first laser element and at least one additional laser element having a rear laser mirror, an output mirror that is 100% reflective at normal incidence and
Abstract:
The subject matter of the invention is a laser exposure apparatus for exposing a screen (24) held in a frame (28), more specifically for Computer-to-Screen exposure. A low-cost method and a low-cost laser exposure apparatus of the type mentioned herein above by means of which the screen is readily held in an accurately defined position during exposing are achieved by having the screen holding device (10) including a screen support (22) with a defined supporting surface, with the screen support (22) being disposed in such a manner that the screen (24) is adapted to be placed onto said screen support (22) whilst the frame (28) is freely suspended beside said screen support (22), being held by said screen (24), and that at least one positioning pin (16, 18) mounted to said screen holding device (10) engaging into a positioning opening (30, 32) provided on said frame (28) if said screen (24) rests on said screen support (22).
Abstract:
[Problem] It is an object of the present invention to provide a method that can provide regions having different thicknesses of a laminated body containing an organic compound with a light-emitting property in the same element and also can apply an electric field uniformly in all the regions of the element without depending on the thickness of the laminated body containing an organic compound with a light-emitting property. [Means of Solving Problem] One laser element of the present invention has a laminated body containing an organic compound with a light-emitting property between two electrodes, and the laminated body includes a mixed layer of a metal oxide and an organic compound, which has a thickness distribution. The laser element emits light having different wavelengths in regions having different thicknesses of the mixed layer of a metal oxide and an organic compound, by applying voltage between two electrodes to feeding a current.
Abstract:
An optically-pumped ˜620 nm europium doped solid state laser is disclosed, with improved efficiency and practicality. The inventive laser device include laser active media comprising an europium doped dielectric solid state gain element, placed within a laser cavity, and pumped with either green (˜530 nm) or blue (˜470 nm) pump radiation at selected wavelengths obtained from frequency-doubled surface-emitting infrared laser diodes. A solid state laser emitting at a wavelength of ˜310 nm is also disclosed, comprising a frequency-doubled ˜620 nm europium-doped solid state laser.
Abstract:
A diode-pumped solid-state laser oscillator optically pumps a laser medium. The oscillator has at least one pumping light source that emits light in a predetermined wavelength band, and a laser medium that absorbs light in the wavelength band. In the wavelength band, the optical absorption index of the laser medium increases with an increase in wavelength, and the optical radiation energy of the light source decreases with an increase in wavelength. Thus, with respect to wavelength changes, an increase in the optical absorption index is cancelled out by a decrease in the radiation energy, making the stability of the laser output less dependent on the temperature of the optical pumping medium or laser medium.
Abstract:
A laser oscillator is disclosed by means of current excitation by using a light-emitting element containing an organic matter. The present invention is a semiconductor device oscillating laser by current excitation comprising a light-emitting element having a laminated body which is formed by stacking sequentially a first layer made from an organic matter, a second layer containing an organic matter and a metal compound, and a third layer made from an organic matter interposed; and a first electrode and a second electrode formed over a substrate, the electrodes interposing the laminated body therebetween; wherein the organic matter contained in the second layer includes at least a light-emitting material.
Abstract:
The present invention concerns a laser with a laser crystal in wafer form. In order to provide a laser apparatus with laser materials in wafer form which are improved over the state of the art, and a process for the production of improved laser materials in wafer form for such laser apparatuses, it is proposed in accordance with the invention that the laser crystal is of the chemical composition MIRIII(WO4)2, wherein M1 stands for an alkali metal, RIII stands for a lanthanide and X stands for a laser-active doping substance.
Abstract:
The invention is directed to optical devices comprising a solid-state structured glass substrate having at least one waveguide incorporated therein, particularly waveguides and lasers incorporating such structure. The invention is also directed to methods for modifying such devices and their properties. The waveguides and lasers of the invention provide advantageous high power and increased slope efficiency and find use, for example, in telecommunications applications.