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The XY-Lab is named after the triple grating spectrometer Dilor XY 800 placed in it. Due to its versatile construction it is suited for various spectroscopic investigations in the extended visible spectral range (350—900 nm). The three gratings (1800 l/mm) can be used either in a subtractive or an additive mode. In the subtractive configuration the first two gratings reduce the stray light; we can do Raman-spectroscopic investigations down to 5 cm-1 with various excitation wavelengths. In the additive configuration (combined with Notch-filters) the spectral resolution is tripled compared to the subtractive mode.
An argon/krypton-gas laser (458-676 nm) and a titanium-sapphire-laser (700-1000 nm) serve as standard excitation sources and the detection takes place with a nitrogen- or a Peltier-cooled CCD dependent on the spectral range. The spectrometer is equipped with macro as well as with microscope optics. Both can be used with a cryostat for low temperature measurements down to 1.5 K and 4 K. A scanner optics combined with a stepping-motor driven microscope table serves for spatially resolved measurements with a lateral resolution of about 1 µm.

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