The LINC-NIRVANA high layer wavefront sensor laboratory experiment: Progress report

ABSTRACT LINC-NIRVANA is a near infrared interferometric imager with a pair of layer-oriented multi-conjugate adaptiveoptics systems (ground layer and high layer) for the Large Binocular Telescope. To prepare for the commissioningof LINC-NIRVANA, we have integrated the high layer wavefront sensor and its associated deformable mirror (aXinetics-349) in a laboratory, located at Max Planck Institute for Astronomy, in Heidelberg, Germany. Togetherwith a telescope simulator, which includes a rotating eld and phase screens that introduce the e ects of theatmosphere, we tested the acquisition of multiple guide stars, calibrating the system with the push-pull method,and characterizing the wavefront sensor together with the deformable mirror. We have closed the AO loop withup to 200 Zernike modes and with multiple guide stars. The AO correction demonstrated that uniform correctioncan be achieved in a large eld of view. We report the current status and results of the experiment.Keywords: adaptive optics, LINC-NIRVANA, laboratory setup