Bruker Optik Gmbh

Michael Juette

Axel Keens

Matthias Boese

Rolf Steinbrunn

An IR microscope () is constituted such that, in an optical viewing mode in a beam path of visible light (VIS-R, VIS-T), a first intermediate focus (ZW) is imaged onto a flat detector surface () of a camera. The IR microscope () is constituted such that, in the beam path of the visible light (VIS-R, VIS-T), the first intermediate focus (ZW) is imaged onto a second intermediate focus (ZW), and, in the second intermediate focus (ZW), a Mangin mirror () is disposed that corrects a field curvature of the Cassegrain objective (). The invention provides an IR microscope in which the field curvature generated by the Cassegrain objective is corrected in a simple manner in the optical viewing mode when detection is performed using a flat detector and without restricting the spectral range of the IR microscope.

IR microscope with image field curvature compensation, in particular with additional illumination optimization

An ATR objective () for an IR microscope has a Cassegrain objective (), an ATR crystal (), a holding bar () to one end of which on the side of the sample, the ATR crystal () is mounted, a holding element (), thin struts () which rigidly connect the holding bar () to the holding element () and intersect an optical path of the ATR objective () entering or exiting the Cassegrain objective () in such a fashion that they shade less than 10% of the beam cross-section of the optical path, and a motor drive () for axial movement of the holding element () relative to the sample position (). The automated ATR objective thereby enables simple adjustment of operating modes and different contact pressures of the ATR crystal with respect to a sample ().

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Karlsruhe, Germany

Michael Juette