Carl Zeiss Meditec Ag

Gerard Antkowiak

Martin Hacker

Ralf Ebersbach

Thomas Pabst

Matthias Reich

Tobias Bühren

Ferid Bajramovic

Peter Klopfleisch

Ingo Koschmieder

Roland Bergner

Ulf Peterlein

Marco Hanft

Wilfried Bissmann

Karsten Festag

Elke Ebert

Steffen Dubnack

Eberhard Hofmann

Juergen Ledermann

Heino Weigand

Christian Deutsch

Michael Guentzschel

The claimed embodiments relate to methods for characterizing a laser beam () of a laser processing system (). The method includes a) providing an aperture arrangement () with a plurality of apertures () in a work plane () of the laser processing system () such that the apertures () extend within the work plane (). The method also includes b) scanning the laser beam () along a scanning direction () parallel to the work plane () across the aperture arrangement () in such a way that the laser beam () at least partially sweeps over the apertures (). The method also includes c) determining a respective energy of the laser beam () transmitted through the apertures () during the scanning process, and d) determining an extent of the laser beam () along the scanning direction () using the determined energy of the laser beam () transmitted through a first aperture () of the plurality of apertures () and determining an energy parameter of the laser beam () on the basis of the determined energy of the laser beam () transmitted through a second aperture () of the plurality of apertures (). In this case, the first aperture () has a predetermined extent along the scanning direction (), which is smaller than the mean diameter of the laser beam () in the work plane (). In addition, a second aperture () has an extent that is larger than the laser beam () in the work plane () and is designed to transmit the laser beam () essentially completely.

Methods for characterizing a laser beam of a laser processing system, diaphragm assembly and laser processing system

A device for determining biometric variables of the eye, as are incorporated in the calculation of intraocular lenses including a multi-point keratometer and an OCT arrangement. The keratometer measurement points are illuminated telecentrically and detected telecentrically and the OCT arrangement is designed as a laterally scanning swept-source system with a detection region detecting the whole eye over the whole axial length thereof. Illumination points are arranged in three rings concentrically around an instrument axis; and the three rings include a first ring, a second ring and a third ring and the illumination points on the first ring and the third ring are rotated in relation to the illumination points on the second ring such that each of the illumination points on the first ring is on a common radial with one of the illumination points on the third ring and each of the illumination points on the second ring is not on the common radial.

Device for reliably determining biometric measurement variables of the whole eye

A device for determining biometric variables of the eye, as are incorporated in the calculation of intraocular lenses including a multi-point keratometer and an OCT arrangement. The keratometer measurement points are illuminated telecentrically and detected telecentrically and the OCT arrangement is designed as a laterally scanning swept-source system with a detection region detecting the whole eye over the whole axial length thereof. The multi-point keratometer ensures that a sufficient number of keratometer points are available for measuring the corneal surface. By contrast, telecentricity ensures that the positioning inadequacies of the measuring instrument in relation to the eye to be measured do not lead to a local mismatch of the reflection points. The swept-source OCT scan detects the whole eye over the length thereof so that both anterior chamber structures and retina structures can be detected and a consistent whole eye image can be realized.

A device for swept-source optical coherence domain reflectometry (SS OCDR) on moveable samples, particularly human eyes, for obtaining A-scans, having a measuring range according to the sample length and having a laser light source which can be adjusted by a main wave number kand at least one receiver for the light dissipated from the sample, wherein the sample is illuminated on the sample surface by a measurement beam having a diameter D by way of a coupling device. The light source has a spectral line width of &#x3b4;k&#x3c;168 mand the adjustment of the light source is carried out in &#x3c4;&#x3c;44 s/(D*k).

Device for swept source optical coherence domain reflectometry

An ophthalmological measuring system, for obtaining biometric data of an eye, provided with the necessary calibration and check devices for monitoring the functionality and the calibration status. The ophthalmological measuring system includes an illumination source for illuminating an eye with light and with a sensor for recording and analyzing back-scattered or reflected light components and a controller. At least one calibration and check system integrated in the ophthalmological measuring system for monitoring the functional and calibration status is provided. A device is also provided which houses the calibration and test structures and which reads off the individual physical data therefrom by an interface. The ophthalmological measuring system is in particular provided for determining biometrical data but can also be used for ophthalmological, dermatological or other devices which require calibration and/or functional checking at regular intervals.

Ophthalmological measuring system and method for calibrating and/or adjusting the same

An ophthalmological measuring system for determining distances and/or for tomographic imaging of ocular structures, based on an OCT method. The measuring system includes a light source with a spectral centroid (&#x3bb;), an interferometric measuring device, a scanner system, which in addition to the lateral deflection of the sample beam also has axial modulations with a frequency (f) in the sample arm, and a control and evaluation unit. The scanner performs a lateral, two-dimensional deflection of the sample beam with the aid of one or even two separate mirror elements and can in particular have axial modulation amplitudes z&#x3e;&#x3e;&#x3bb;/2. The system can also be used for scanner systems in other fields that use an OCT method, in particular a swept-source OCT method.

OCT-based ophthalmological measuring system

An optical deflection unit for targeted radiation, e.g., produced by laser or superluminescent diodes, in scanning, ophthalmological measuring and therapy systems, comprises a deflection mirror, a position sensor and a control unit, which form a control circuit for minimizing the deviation of the actual positions, detected by the position sensor, from the desired positions of the deflection mirror, whereby the optical deflection unit comprises a deflection mirror, oscillatingly movable by means of non-contacting electromagnetic drives around at least one rotation axis, and which is positioned in the direction of the, at least, one rotation axis between at least two bearings. The optical deflection unit is designed may also be used for beam guidance in high and ultrahigh vacuum installations, such as UV and EUV exposure installations for semiconductor lithography.

Optical deflection device for scanning, ophthalmologic measurement and therapy system

Device for swept-source optical coherence domain reflectometry

An ophthalmological biometric or image-producing system and method for detection and analysis of measurement data including a measurement arrangement with an illumination unit for illuminating the eye with at least one measurement beam, a signal detection unit for the detection of the light portions scattered or reflected back from the eye, a central control unit with an output unit, and a pattern generating unit which includes an optical scan unit, a control unit as well as a position sensor for measuring the realized deflections of the optical scan unit, whereby control unit, optical scan unit and position sensor can form a control circuit. Thereby, the position sensor, except for the connection within the possible control circuit, includes a connection to a unit of the measurement arrangement for optimizing measurement value logging or to the central control unit for correcting the biometric measurements or tomograms.

Ophthalmologic biometric or image generating system and method for detection and evaluation of measured data

A solution by which an examination of the cornea for possible encapsulations, air bubbles, or other irregularities following a refractive surgery can be carried out directly at the treatment device instead of the patient having to be transferred to an examination device. The additional slit illumination system includes two slit projector units substantially symmetrically mounted at an angle of about 40&#xb0; to the optical axis of the refractive treatment device, and fixed and focused on the eye of the patient to be examined. The slit projector units include a light source, a projection optical system, and beam forming and/or conducting optical components. Although intended for surgical microscopes, it can also be used for other opthalmologic treatment devices that would benefit from a slit projection system for the examination before, during, or after the treatment procedure.

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Jena, Germany

Gerard Antkowiak