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Adaptive optics (AO) instruments for the future extremely large telescopes(ELTs) are characterized by advanced optical systems with diffraction-limitedoptical quality. Low geometric distortion is also crucial for high accuracyastrometric applications. Optical alignment of such systems is a crucial stepof the instrument integration. Due to relative inaccessibility of these giantinstruments, automatic alignment methods are also favored to improve theinstrument availability after major events, such as extraordinary maintenance.The proposed alignment concept for these systems is described: the notableexample which is analyzed here is the case of the multiconjugate AO relay forthe future ELT. The results of ray-tracing simulations carried out to validatethe method are discussed in detail, covering the error sources, which coulddegrade the alignment performance.

Simulating the optical alignment of the multiconjugate adaptive optics module for the extremely large telescope