Abstract: A semiconductor component that includes a photosensitive doped semiconductor layer, in which electrical charge carriers are released during absorption of electromagnetic radiation is disclosed. The photosensitive semiconductor layer has a structured interface and at least one layer which generates an electric field for separating the released charge carriers disposed downstream of the structured interface. The electric field extends over the structured interface. The photosensitive semiconductor component is distinguished by a high efficiency of the charge carrier separation, in particular, for generating an electric current.

Abstract: The invention relates to an optical fiber as an optical waveguide for the single-mode operation. The present invention proposes a fiber having a microstructure, by which the propagation of modes of a higher order are selectively suppressed in the optical waveguide. At the same time, the propagation of transversal modes of a higher order is dampened more strongly than the propagation of the fundamental modes of the optical waveguide.

Abstract: The present invention relates to a device (12) and to a method for amplifying light impulses (13). The device comprises a stretcher (15) stretching the light impulses over time, at least one amplifier (16) amplifying the stretched light impulses, and a compressor (17) compressing the stretched and amplified light impulses, wherein the amplifier (16) applies a non-linear phase generated by self-phase modulation to the stretched light impulses. In order to provide a device and a method for amplifying light impulses, by means of which light impulses having higher light impulse quality and light impulse peak power can be generated, the invention proposes that means for spectrally shaping the light impulses are disposed ahead of the amplifier (16) in the beam path, wherein the means for spectrally shaping the light impulses bring about a spectral trimming of the light impulses.

Abstract: It is an object of the present invention to provide a compact and low-cost system for generating ultra short high energy laser light pulses that does not use the known CPA scheme. The proposed approach is based on spectral filtering of laser light pulses of a mode locked laser source. The used mode locked laser source can be of any kind as long as its filtered residual pulse bandwidth supports pulse durations longer than 20 ps and up to 1 ns. After filtering the laser light pulses are directly amplified in an amplification element consisting of one or more amplification stages. At the same time or just after amplification the light pulses are spectrally broadened through a spectral broadening element, for example a fiber of suitably chosen core diameter and length to achieve a spectral bandwidth that is wide enough to support sub 10 ps pulses. Finally, the spectrally broadened laser light pulses are compressed by a compact dispersive element consisting of one or more Bragg gratings or a grating pair.

Abstract: The present invention relates to a device (1, 11) for amplifying light pulses (2, 12), the device comprised of a stretcher (4, 14) which temporally stretches the light pulses (2, 12), and comprised of at least one amplifier (5, 15) which amplifies the stretched light pulses (2, 12), and comprised of a compressor (6, 16) which recompresses the stretched and amplified light pulses (2, 12), the stretcher (4, 14) and the compressor (6, 16) being dispersive elements with essentially oppositely identical dispersion. To provide a device (1, 11) for amplifying light pulses (2, 12) which is of a compact setup and which can be flexibly applied, the present invention proposes that the dispersion of the amplifier (5, 15), the dispersion of further optical elements of the device (1) and/or a mismatch of dispersion of the stretcher (4, 14) and compressor (6, 16) are at least partly compensated by self-phase modulation of the light pulses (2, 12) and/or by at least one additional element (17) of variable dispersion.

Abstract: A device for joining and tapering optical components such as fibers includes a retaining device for holding optical components in a processing site, a laser radiation source for emitting a laser beam and beam forming elements for guiding the laser beam to the processing site. At least a first beam forming element is inserted into the beam path of the laser radiation source for producing a radiation having the form of an annulus and a second beam forming element is provided for specifying the angle of incidence of the radiation having the form of an annulus onto the optical components at the processing site.

Abstract: The present invention relates to a method for laser-assisted bonding of substrates, in which these are connected together firstly frictionally by pressing together and subsequently strengthening of the connection between the substrates is effected by activation in regions which is induced by laser irradiation. The invention likewise relates to substrates produced accordingly.

Abstract: The present invention relates to a method for joining two or more components made of glass, ceramic, and/or glass ceramic, using a soluble glass joining solution having sodium, potassium, and/or lithium ions and/or a silica sol, the joining solution being applied to joint surfaces between the components to be joined and solidified at mild temperatures, the method being either characterized in that the joining solution comprises an additive selected among boric acid, boron compounds from which boric acid can result by hydrolysis, aluminum acetates, aluminum silicate/NH3/H2O titanium compounds forming titanium hydroxy cations, water-soluble zinc compounds, water-soluble zircon compounds, and water-soluble yttrium compounds, wherein said additive is added in an amount that reduces the pH value of the underlying soluble glass, and/or characterized in that, after the joining solution is applied and the components to be joined are brought together and fixed, the joined components are dried by removing water at room

Abstract: A semiconductor component that includes a photosensitive doped semiconductor layer, in which electrical charge carriers are released during absorption of electromagnetic radiation is disclosed. The photosensitive semiconductor layer has a structured interface and at least one layer which generates an electric field for separating the released charge carriers disposed downstream of the structured interface. The electric field extends over the structured interface. The photosensitive semiconductor component is distinguished by a high efficiency of the charge carrier separation, in particular, for generating an electric current.

Abstract: A directly modulatable laser comprising an active medium inside a laser cavity formed by a resonator mirror and an out-coupling mirror, and a pump light source exciting the active medium. It is characterized in that the active medium generates radiation of two wavelengths (&lgr;1 and &lgr;2) and the resonator mirror is constructed as a controllable reflector by which the reflectivity is controllable for each of the two wavelengths (&lgr;1 and &lgr;2) and the controllable reflector is connected with a control unit, wherein the reflection factor is controlled in such a way that the inversion density of the electrons which is generated in the active medium is constant and the light output of one of the wavelengths ((&lgr;1) is controllable between a minimum value and a maximum value according to an applied control signal, wherein the control of the two wavelengths ((&lgr;1 and &lgr;2) is carried out in push-pull.

Abstract: A fiber-optic amplifier comprising a laser source which emits signal radiation in a narrow band on one or more wavelengths in a first end of an amplifier fiber, and amplified signal radiation can be coupled out at a second end of the amplifier fiber. The amplifier fiber is a double-core fiber with a pump core and a laser core and the latter is end pumped or side pumped. The amplifier fiber is a multimode double-core fiber at which or within which is arranged, in the area of its first end, an element for transverse mode selection which suppresses modes higher than the fundamental mode.

Abstract: A fiber amplifier is disclosed comprising a signal source (oscillator), an amplifier fiber and a pump laser. The amplifier fiber is arranged between two polarizers and a portion of the beam that is depolarized in the amplifier fiber is coupled out at the amplifier output, returned to the amplifier input, coupled into the amplifier fiber with the radiation from the signal source and amplified again, and another portion, as linearly polarized beam, exits the fiber amplifier as useful beam.

Abstract: An arrangement which generates red, green and blue laser radiation comprise a laser radiation source whose first beam (&lgr;l) is split in the infrared wavelength range, wherein the first part of this beam is frequency-doubled and green light (&lgr;G) results and another part is used to generate light of the primary colors red (&lgr;R) and blue (&lgr;B). Another part of the first beam (&lgr;l) is fed to a wavelength converter which generates another beam (&lgr;2, &lgr;4) in the infrared wavelength range which has a greater wavelength than the first beam (&lgr;l), further, the colors red (&lgr;R) and blue (&lgr;B) result from the further beam (&lgr;2, &lgr;4) or from a part thereof by another nonlinear process by sum frequency mixing or by frequency doubling or by sum frequency mixing and frequency doubling.

Abstract: A directly modulatable laser comprising an active medium inside a laser cavity formed by a resonator mirror and an out-coupling mirror, and a pump light source exciting the active medium. It is characterized in that the active medium generates radiation of two wavelengths (&lgr;1 and &lgr;2) and the resonator mirror is constructed as a controllable reflector by which the reflectivity is controllable for each of the two wavelengths (&lgr;1 and &lgr;2) and the controllable reflector is connected with a control unit, wherein the reflection factor is controlled in such a way that the inversion density of the electrons which is generated in the active medium is constant and the light output of one of the wavelengths ((&lgr;1) is controllable between a minimum value and a maximum value according to an applied control signal, wherein the control of the two wavelengths ((&lgr;1 and &lgr;2) is carried out in push-pull.