Abstract: A mode-synchronized solid-state laser comprising a laser medium inside a laser resonator which is formed by a resonator mirror and an output coupling mirror and which is folded by at least one concave folding mirror, with a saturable absorber inside the laser resonator and with at least one laser pump source whose pump beam pumps the laser medium, wherein the elongated resonator length L is a function of the pulse repetition frequency and the latter is determined by a distance between the resonator mirror and the output coupling mirror.

Abstract: A resonator mirror with a saturable absorber for a laser wavelength &lgr;L formed of a series of layers of a plurality of semiconductor layers on a substrate, wherein a Bragg reflector formed of a plurality of alternately arranged layers comprising a first material with an index of refraction nH and a second material with a lower index of refraction NL compared with the latter is grown on a surface of the substrate. It is characterized in that a threefold layer is grown on the Bragg reflector, wherein a single quantum layer is embedded within two layers outside an intensity minimum for the laser radiation &lgr;L and the threefold layer has a combined optical thickness of λ L 2 .

Abstract: A video projection system for projecting more than one picture in which a light source for generating at least one light bundle, an intensity modulator and a spatial light bundle modulator, wherein they are controlled by a video signal, and at least one projection surface for displaying a determined quantity or quantities of individual pictures are arranged in the direction of light of a beam path. The video projection system contains a quantity or quantities of projectors which correspond(s) to the quantity or quantities of individual pictures, each projector having a spatial light bundle modulator, wherein they are optically connected with the light source. The light bundle is divided into a quantity or quantities of partial light bundles which correspond(s) to the quantity of projectors are arranged following the one light source, considered in the direction of the beam path, each of which partial light bundles has a partial beam path, followed in each partial beam path by an intensity modulator.

Abstract: In a process and an apparatus for generating at least three light bundles of different wavelength for displaying color images, one of these light bundles having a longest wavelength and another of the light bundles having a shortest wavelength, which light bundles are obtained by an OPO and further nonlinear optical component elements from a signal beam and/or idler beam of the OPO and/or a primary light bundle, from which a beam exciting the OPO is also derived, it is provided that at least a partial light bundle is separated from the primary light bundle for exciting the OPO, in that the light bundle with the longest wavelength and the light bundle with the shortest wavelength are obtained from the signal beam and/or idler beam of the OPO by way of frequency multiplication and/or frequency mixing with another partial light bundle of the primary light bundle by excluding components of light bundles other than the generated light bundles with the shortest and longest wavelengths for image display.

Abstract: In a rear projector with a housing on whose front side is arranged a screen for displaying a video picture, with a brightness-modulated and color-modulated R-G-B light source for emitting a light bundle, with a deflecting device for scanning this light bundle, wherein the light bundle is deflected by the deflecting device over a total angle &agr; with respect to vertical scanning, and with a deflecting mirror which is located in the housing and arranged at an angle &dgr;, wherein the light bundle exiting from a real or virtual vertex of the total deflection angle &agr; is deflected onto the screen by the deflecting mirror, the virtual or real vertex located in front of the deflecting mirror lies at a location where the smallest angle &bgr; of the light bundle to the surface of the screen during deflection is less than 20° and the angle &dgr; is given by δ ≤ 45 ⁢ ° - α 4 + β

Abstract: In a device for displaying a video image with a source emitting at least an intensity-modulated light bundle (41, 42) and a deflecting device (41, 42) for deflecting the light bundle, for the angle-proportional scanning of N.sub.p image points in lines over an angle .alpha..sub..rho., and for the angle-proportional scanning of the light bundle of N.sub.z, lines of the video image over an angle .alpha..sub.z, the source emits two light bundles which can be modulated independently from one another, the first light bundle being modulated with the video information for the illumination of a first image point controlled by raster scanning and the second light bundle being modulated with the video information for the illumination of a second image point, wherein the video information of the second image point is offset relative to the video information of the first image point by m.sub.z lines of an image and m.sub..rho. image points of a line, with whole numbers m.sub.z .ltoreq.N.sub.z and m.sub..rho. .ltoreq.N.

Abstract: In a process for color transformation from the input-side primaries (R, G, B) to image-side primaries (R", G", B") with a greater color stimulus specification region than that given by the input-side primaries (R, G, B), a color transformation is carried out by converting the components of a color vector from the input-side primaries to fictitious primaries (R', G', B') so that the color stimulus specification of the color vector is changed, and transforming of the converted components of the color vector from the fictitious primaries (R', G', B') to the image-side primaries (R", G", B") for generating image-side components of the color vector, wherein the image-side color stimulus specifications produced in this way have the same hue and the same saturation as the transformed color stimulus specification in the fictitious primary system (R', G', B').

Abstract: In a device with a laser for image presentation in which the laser emits laser light of a defined coherence length L at a given wavelength .lambda. and in which there is arranged in the path of the laser light a first structure with which phase displacements can be carried out for individual photons of the laser light in accordance with a predetermined distribution, it is provided that the average path given by the ratio of the average root mean square of the phase displacement formed by the distribution and the magnitude of the wave vector k=2.pi./.lambda. of the laser is greater than the coherence length L multiplied by a factor of 1/(12).sup.1/2.

Abstract: In an arrangement for displaying images on a projection screen, which arrangement includes a laser, which emits a laser beam, and a deflecting device, which is provided for deflecting the laser beam, and an image-generating device which is connected to a controlling device for controlling the laser and the deflecting means. The image-generating device is switchable in two operating modes, the first operating mode being the standard operating mode for projecting, and the second being an operating mode in which the laser radiation is harmless to a person disposed in the region to which the laser has access.

Abstract: In a process for generating a stereoscopic video picture by using partial images for the left eye and the right eye of an observer, which partial images emit light with different polarization states oriented orthogonally relative to one another, wherein the observer perceives the stereoscopic video picture through spectacles with eyepieces which filter the respective polarization state of the light. At least one light source is used for generating every partial image. This light source emits a substantially parallel, polarized light bundle which can be controlled with respect to intensity and whose polarization state is identical to one of the two orthogonal polarization states or can be converted into this polarization state with low loss and is raster-scanned on a screen to generate at least one partial image.

Abstract: In a suggested process for the transmission of a light bundle which is provided for illuminating picture points of a video picture and has a divergence angle and beam diameter determined by the way in which the light bundle is generated, the light bundle being coupled into a light guide and coupled out with an optical system for bundling a transmitted light bundle exiting the light guide, a divergence angle for the light bundle exiting the light guide is adjusted, by means of the optical system, proportionally to the divergence angle given by the manner in which the light bundle is generated, wherein the proportionality factor is the ratio of the given beam diameter before being coupled into the light guide to the beam diameter of the light bundle emerging from the optical system. A video system for carrying out the process has a suitably dimensioned optical system.

Abstract: A double-core light-conducting fiber comprise a pump core, a laser core which is arranged centrically in the pump core, and a cladding surrounding the pump core. The pump core which is constructed with a substantially circular cross section has at least one ground portion on the outside which extends in the light direction of the double-core light-conducting fiber and amounts to 1% to 49% of the diameter of the pump core. A process for the production of the double-core light-conducting fiber and to a double-core fiber laser and to a double-core fiber amplifier are also disclosed which use the double-core light-conducting fiber according to the invention. The substantially round pump core with its centrically arranged laser core enables a simple connection with other fiber-optic components and a simple coupling in of the pumping light.

Abstract: In a process for processing a first video picture with image points in m.sub.1 lines, whose image points in the l.sub.1 -th line have an intensity I.sub.1 (t, l.sub.1) depending on a parameter t, in particular depending on time, for generating a second video picture with m.sub.2 lines, the respective intensity I.sub.2 (t, l.sub.2) of an image point in the l.sub.2 -th line of the second video picture is interpolated from the intensities of the image points of the first video picture I.sub.1 (t, l.sub.1), wherein I.sub.2 is obtained according to the following equation:I.sub.2 (t,l.sub.2)=Max(J(t,l.sub.2)+.DELTA.;0),where the values J, with respect to the lines, represent discretized values of a signal waveform given by the sampling theorem and in which an offset .DELTA.

Abstract: The invention concerns an integrated-optical channel waveguide and its applications as switch, modulator, and sensor. The channel waveguide is placed into or onto the flat substrate material and features a geometrically narrowly delimited channel-shaped structure, where the delimitation is located vertical to the propagation direction of the light. A single-mode integrated-optical wideband channel waveguide is described which is capable of guiding, e.g., light from the entire visible wavelength range in single-mode and effectively, that is, at low optical attenuation, and which thus represents a real single-mode white light channel waveguide. If required, the light can be switched and modulated, wavelength-dependent, or wavelength-independent, e.g. by electro-optical techniques. The channel waveguide is fabricated by means of basically known processes, e.g. by changing the refractive index.

Abstract: The invention concerns an integrated-optical junction splitter, in particular for applications in the wavelength range of visible light, which ensures a spatial and wideband combination of light in a wavelength spectrum .DELTA..lambda. greater than 75 nm (value given applies to short-wave visible light). In the case of a usable wavelength range comprising the entire spectrum of visible light, the junction splitter is a white light junction splitter. The junction splitter consists of at least three channel waveguides, at least one of which must be a single-mode integrated-optical wideband channel waveguide (SOWCW). Two channel waveguides each have a respective input and are combined into a common SOWCW at their outputs in a coupling point, which common SOWCW features a common light output at its end.This wideband junction splitter is used as a wavelength-selective or wavelength-independent switch or modulator, in interferometric and photometric devices, sensors, and microsystem-technical solutions.

Abstract: In an amplifier which generates an output voltage which is proportional to an input voltage and can be picked off between the outputs of two push-pull output stages and has peak-to-peak values of up to twice the supply voltage of the push-pull output stages, each push-pull output stage is driven by a differential amplifier having a positive and a negative differential input in each instance and whose polarity is so defined that the outputs of the two push-pull output stages have voltages of like polarity when identical voltages are present between the positive and negative differential inputs of the two differential amplifiers, a differential input of one differential amplifier being connected with a differential input of like polarity of the other differential amplifier. The remaining two differential inputs of the differential amplifiers are provided for applying a voltage proportional to the input voltage.

Abstract: In a process for generating at least three laser beams of different wavelengths for displaying color video pictures, a pulsed laser is used to generate light. The light output of the pulsed laser is released in a pulse and is introduced into a medium with nonlinear optical characteristics for generating a laser beam. In addition to the laser beam generated by excitation, this medium releases an additional laser beam whose frequency is given by the sum or difference frequencies of the exciting laser beam and the excited laser beam due to the nonlinear optical characteristics of the medium. The laser beams generated by the medium in this way and the exciting laser beam are used directly, or after frequency conversion, to display monochromatic partial images of a color video picture. An apparatus according to the invention contains suitable devices for carrying out the process.

Abstract: In a video system for displaying a video picture composed of image points, whose color values and/or brightness values can be stored sequentially, according to a first set of parameters with predetermined parameter values containing number of lines, number of image points, line frequency and frame frequency as parameters, in an image storage which can be read out in accordance with a second set of parameters with different or identical parameter values for the parameters for displaying the stored video picture by means of a display device, the display device contains an individual light source which can be controlled in accordance with the color values and/or brightness values of the image points and whose light bundle can be projected onto a picture screen via an optical system, wherein the optical system has a raster scanning device by which the light bundle can be directed onto the picture screen on optional points within an image field for displaying the video picture of suitable dimensions and for which

Abstract: In a projection system for projecting a video picture composed of picture points on a screen with at least one light source which emits a light bundle and can be varied in intensity and with a deflecting device which deflects the light bundle to illuminate the picture points on the screen, a transformation optical system having at least two stages is arranged between the deflecting device and the screen and is corrected according to the tangent condition so as to be free of distortion. The transformation optical system has at least two optical stages. The first optical stage produces an intermediate image plane which is imaged on the screen by means of the subsequent optical stage (s).