  High resolution spectroscopy made an important step ahead 10 years ago,
leading for example to the discovery of numerous exoplanets. But the IR did not
benefit from this improvement until very recently. CRIRES will provide a
dramatic improvement in the 1-5 micron region in this field. Adaptive optics
will allow us increasing both flux and angular resolution on its spectra. This
paper describes the adaptive optics of CRIRES, its main limitations, its main
components, the principle of its calibration with an overview of the methods
used and the very first results obtained since it is installed in the
laboratory.
