Abstract: A stereomicroscope includes a stereoscopic main observer beam path having a main observer zoom system, a stereoscopic co-observer beam path having a co-observer zoom system, and a main objective common to the main observer beam path and the co-observer beam path. The co-observer beam path is coupled out from the main observer beam path via a geometrical beam splitter arranged between the main objective and the main observer zoom system, wherein in the co-observer beam path the co-observer zoom system succeeds the geometrical beam splitter and is constructed from lenses having dimensions such that both a first and a second stereoscopic partial beam of the co-observer beam path in each case pass through the lenses.

Abstract: The disclosure relates to an optical system for inspecting an eye, having an OCT system which is configured to generate a measurement beam, which is incident on an object region in a converging manner to form a measurement focus. The OCT system has a beam expander which is disposed along the measurement beam between the scanning system and the objective lens and generates an intermediate focus between the scanning system and the objective lens. The OCT system is configured to generate different values of a beam waist diameter of the beam waist by means of controlling the controllable beam expansion of the beam expander. At the different values of the beam waist diameter, an axial beam waist position of the beam waist is substantially identical.

Abstract: A surgical microscope for imaging structures of an eye includes: a front optical unit, an illumination device which has an illumination-radiation-emitting illumination source and which illuminates the retina of the eye with an illumination spot via an illumination beam path which extends through the front optical unit, a camera and an adjustable camera optical unit disposed upstream thereof, an imaging beam path which extends through the front optical unit and the camera optical unit, and a control device which controls the camera optical unit and sets the latter in such a way that the retina of the eye in the region of the illumination spot is imaged on the camera. The control device varies a focusing state of the camera optical unit and, as a result thereof, records a plurality of images of the retina in the region of the illumination spot, the images being focused in different depth planes, and establishes a refractive value of the eye from these images.

Abstract: An illumination optics illuminates an object field of a projection exposure apparatus for microlithography. The illumination optics include a condenser group of optical components which guide a bundle of useful light. An objective group of bundle-guiding components is arranged downstream of the condenser group. At least one component of the condenser group and at least one component of the objective group are displaceable for compensation of deviations of the object field, which is in an actual illumination state, from a desired illumination state.

Abstract: An optical system images an object region with an optical beam path in an image plane of an image acquisition system. The optical system includes a first optical assembly through which the optical beam path passes and a second optical assembly arranged in the optical beam path on the side of the first optical assembly facing away from the object region. The second optical assembly is a system at least partly compensating longitudinal chromatic aberrations of the first optical assembly occurring in the wavelength range 625 nm???850 nm of the light.

Abstract: An optical imaging system generates an image of an object plane and includes a lens system which, in turn, includes a main objective and a reduction optical unit between the main objective and the object plane. The reduction optical unit includes a first composite element with a positive refractive power and a second composite element with a negative refractive power. The first composite element includes a first and second lens. The second composite element includes a third and fourth lens. An object-side first main plane and an image-side second main plane are defined by the lens system. The optical imaging system defines an observation beam path which is guided through the lens system so that, in each of the first main plane and the second main plane, the observation beam path is at a distance from the optical axis of the lens system.

Abstract: The disclosure relates to an optical system for inspecting an eye, having an OCT system which is configured to generate a measurement beam, which is incident on an object region in a converging manner to form a measurement focus. The OCT system has a beam expander which is disposed along the measurement beam between the scanning system and the objective lens and generates an intermediate focus between the scanning system and the objective lens. The OCT system is configured to generate different values of a beam waist diameter of the beam waist by means of controlling the controllable beam expansion of the beam expander. At the different values of the beam waist diameter, an axial beam waist position of the beam waist is substantially identical.

Abstract: A stereoscopic microscopic providing at least one pair of stereoscopic optical paths comprises an objective system, a first focusing lens having a first optical refractive power and a second focusing lens having a second optical refractive power and at least one actuator. The first optical refractive power and the second optical refractive have different signs. The objective system and the first and second focusing lenses are commonly traversed by the at least one pair of stereoscopic optical paths, respectively. The actuator shifts at least one of these first and second focusing lenses along the at least one pair of stereoscopic optical paths to change the working distance and/or to vary an optical refractive power of at least one of these first and second focusing lenses. The first focusing lens is immediately neighboring the objective system along the at least one pair of stereoscopic optical paths.

Abstract: An optical imaging system generates an image of an object plane and includes a lens system which, in turn, includes a main objective and a reduction optical unit ahead of the main objective. The lens system is aligned along an optical axis and the reduction optical unit includes a first lens with a positive refractive power and a second lens with a negative refractive power. An object-side first main plane and an image-side second main plane are defined by the lens system. The optical imaging system defines an observation beam path which is guided through the lens system so that, in the first main plane and in the second main plane, the observation beam path is at a distance (B) from the optical axis. The first lens is of a first material having a first Abbe number and the second lens is of a second material having a second Abbe number, wherein the first Abbe number is greater than the second Abbe number.

Abstract: A stereomicroscope including a stereoscopic main observer beam path having a main observer zoom system, a stereoscopic co-observer beam path having a co-observer zoom system, and a main objective common to the main observer beam path and the co-observer beam path. The co-observer beam path is coupled out from the main observer beam path via a geometrical beam splitter arranged between the main objective and the main observer zoom system, wherein in the co-observer beam path the co-observer zoom system succeeds the geometrical beam splitter and is constructed from lenses having dimensions such that both a first and a second stereoscopic partial beam of the co-observer beam path in each case pass through the lenses.

Abstract: A laser apparatus for treating tissue in the anterior portion of an eye including a laser for generating a light beam, an optical device for shaping a light distribution and an imaging optical system for imaging the light distribution in a focal plane. The imaging optical system is embodied in such a way that a pupil of the imaging optical system is formed between 2 and 25 mm in front of or behind the focal plane.

Abstract: An ophthalmic device for treating tissue in the anterior of an eye includes a laser for generating a light beam, an optical device for reshaping the light beam into a line focus, wherein a ratio of length to width of the line focus is at least 10, preferably 100, particularly preferably 1000, and an optical system for guiding the light beam to an object plane, in which the tissue to be treated is arrangeable, wherein the laser emits yellow light in a wavelength range between 525 nm and 675 nm, preferably between 550 nm and 610 nm, particularly preferably between 580 nm and 610 nm.

Abstract: A method of performing a capsulotomy comprises applying a light-absorbing agent to a lens capsule of an eye 1; illuminating the lens capsule using a first light beam and recording an image of the lens capsule using a camera 43; analyzing the recorded image and determining whether the light absorbing agent has been correctly applied to the lens capsule; if it is determined that the light absorbing agent has been correctly applied to the lens capsule, directing a shaped second light beam 19 onto a predetermined line on the lens capsule in order to modify a structure of a tissue of the lens capsule. The first light beam can be generated by defocusing the second light beam using a lens 37.

Abstract: A surgical microscope 1 comprises an imaging system 2 providing a magnified multidimensional image of an object 3 disposable in a focal plane 4 of the imaging system 2 along at least one optical imaging path 2a, 2b. The imaging system 2 comprises an objective 5 having at least two lens groups 6, 7, through which the at least one optical imaging path 2a, 2b passes consecutively, and which define the focal plane 4 of the imaging system 2. At least one lens group 6 of the objective is moveable along its optical axis relative to the at least one other lens group 7 of the objective. The objective's first lens group 6 located directly adjacent to the focal plane 4 along the at least one optical imaging path 2a, 2b consists of at least three optical lenses 61, 62, 63 and has altogether a negative optical power.

Abstract: An optical imaging system generates an image of an object plane and includes a lens system which, in turn, includes a main objective and a reduction optical unit between the main objective and the object plane. The reduction optical unit includes a first composite element with a positive refractive power and a second composite element with a negative refractive power. The first composite element includes a first and second lens. The second composite element includes a third and fourth lens. An object-side first main plane and an image-side second main plane are defined by the lens system. The optical imaging system defines an observation beam path which is guided through the lens system so that, in each of the first main plane and the second main plane, the observation beam path is at a distance from the optical axis of the lens system.

Abstract: An optical imaging system generates an image of an object plane and includes a lens system which, in turn, includes a main objective and a reduction optical unit ahead of the main objective. The lens system is aligned along an optical axis and the reduction optical unit includes a first lens with a positive refractive power and a second lens with a negative refractive power. An object-side first main plane and an image-side second main plane are defined by the lens system. The optical imaging system defines an observation beam path which is guided through the lens system so that, in the first main plane and in the second main plane, the observation beam path is at a distance (B) from the optical axis. The first lens is of a first material having a first Abbe number and the second lens is of a second material having a second Abbe number, wherein the first Abbe number is greater than the second Abbe number.

Abstract: An optical observation instrument has two optical transmission channels for transmitting two partial ray bundles (9A, 9B). The optical observation instrument has a main objective (1) common to the optical transmission channels, an electronic image sensor (7) for sequentially recording the partial ray bundles (9A, 9B), an intermediate imaging optical system (3) between the main objective (1) and the image sensor (7) and common to the optical transmission channels, and a tilting mirror matrix (5) between the main objective (1) and the image sensor (7). The intermediate imaging optical system (3) is arranged so that the respective partial ray bundle (9A, 9B) is deflected toward the image sensor (7) and passes the intermediate imaging optical system (3) both on the way from the main objective (1) to the tilting mirror matrix (5) and on the way from the tilting mirror matrix (5) to the image sensor (7).