Abstract: A jointed mirror arm includes at least two tubular pieces, connected to each other by a joint with a reflecting mirror, which, as a result of the joint, may be arranged in varying configurations and which form a beam path for the radiation, with a fixed inlet on a first tube piece for the introduction of radiation from a stationary optical source and a position different from the position of the inlet for the outlet from the intermediate joint arm on a final tube piece for emitting said radiation. The jointed mirror arm is characterized in that a scanner for the radiation is arranged before the inlet into the intermediate jointed arm and an optical imaging system is provided in the at least two tube pieces of the intermediate jointed arm, for imaging the scanner after the output from the intermediate jointed arm.

Abstract: A combined fundus scanning apparatus for optical coherence tomography (OCT) and fundus imaging has an OCT unit (1) with a first light source creating a point-shaped scanning beam, an interferometer with a first sensor for sensing and evaluating the beam reflected by the retina (8), an imaging device (14), which focuses the scanning beam onto the retina (8) of an eye (9) to be examined, as well as a first beam deflection unit (4) to move the scanning beam in the X direction and a second beam deflection unit (11) to move the beam in the Y direction across the retina (8). Fundus imaging is effected by means of a second light source (5) that emits light of a spectral range different from the first light source, which light is also imaged onto the retina (8) via the imaging device (14), and which impinges on a second sensor (10) for sensing the light of the second light source (5) reflected by the retina (8).

Abstract: The components of a fundus camera for observing an eye (11)—namely, an illumination device (1) to illuminate an image field of the eyeground (12) and an image recording device (14) onto which the eyeground (12) is projected by means of a projection device (10)—are positioned to be confocal. The illumination device (1) is so structured that a periodic light pattern is created against the eyeground (12) within the illuminated image field. Further, an offset medium is present to offset the pattern by less than one period. The image recording device (14) is connected to an evaluation unit (22) in order to combine at least three recordings illuminated with offset patterns into a single photograph. A single, unstructured, extremely sharply focused photograph of the eyeground (12) may thus be obtained.

Abstract: An optical system projecting onto an image plane an object that is disposed at infinity by an intermediate image. The optical system includes a front group and a relay optic, each including a plurality of lenses, the intermediate image disposed between the front group and the relay optic. The optical system being configured as the object lying at infinity with at least two switchable and/or zoomable fields of view, the fields of view being imaged into the image plane. The front group including at least three lenses successively disposed towards the image plane. A first one of the lenses including of Ge, at least a second of the lenses including of ZnSe, and at least a third of the lenses including of either MgF2, CaF2 or MgO.

Abstract: An electrooptical element is disclosed, made from a crystal, for an electrooptical modulator (EOM), for example, a Pockels cell, comprising a housing, with the crystal arranged therein in the form of a vertical cylinder, the both end surfaces of which form a front plane, for entry of a light beam and an outlet plane, at a separation from the above, with an annular electrode in contact with each of the above and with a retainer, between the housing and both the outer region of the crystal and the two annular electrodes. The invention is characterized in that the retainer is embodied as an O-ring, concentrically enclosing each annular electrode and forming a closed annular chamber between itself and the housing, made from an electrically-conducting material and a hardened sealing compound, filling the annular chamber.

Abstract: The invention relates to a pockels cell comprising two spaced-apart cubical RTP crystals that have a square cross section, are located one behind another, and are oriented towards each other so as to provide thermal compensation in the direction of radiation. Each of said RTP crystals is provided with electrodes on two opposite faces, said faces of one crystal being rotated by 90° relative to the faces of the other crystal and relative to the direction of radiation (5). Flexible, electrically insulating, high voltage-proof plastic mats which conduct heat well and rest against the inside of a cooling member are provided around the exterior faces of the electrodes.

Abstract: A Faraday rotator for a Faraday isolator with an input polarizer, with an output polarizer, with a roller-shaped optical crystal that is arranged therebetween and that is arranged symmetrical to its axis of symmetry, with a right hollow cylinder that surrounds this and has a hollow space made of a permanent magnetic material, which cylinder is axially magnetized and the magnetic field of which extends in the hollow space approximately parallel to the axis of symmetry that runs in only one direction from the north pole to the south pole, and with terminal magnets attached to each of the two end faces in the plane perpendicular to the y- and z-directions of the axis of symmetry, each of which is embodied as a hollow right cylinder and has a through-aperture in the extension of the axis of symmetry, is characterized in that each terminal magnet is largely radially magnetized with regard to the axis of symmetry at least by region, in that the one of the two terminal magnets is magnetized radially from interior to

Abstract: An optical system projecting onto an image plane an object that is disposed at infinity by an intermediate image. The optical system includes a front group and a relay optic, each including a plurality of lenses, the intermediate image disposed between the front group and the relay optic. The optical system being configured as the object lying at infinity with at least two switchable and/or zoomable fields of view, the fields of view being imaged into the image plane. The front group including at least three lenses successively disposed towards the image plane. A first one of the lenses including of Ge, at least a second of the lenses including of ZnSe, and at least a third of the lenses including of either MgF2, CaF2 or MgO.