NirvanaVIS, exploiting ground-layer AO correction for speckle holography at visible wavelengths

NirvanaVIS is a proposed upgrade in the visible wavelength for LINC-NIRVANA, the Italian-German high angular resolution near-infrared imager installed on the Large Binocular Telescope. LINC-NIRVANA has demonstrated on-sky, a Ground Layer Adaptive Optics correction improving the FWHM of the PSF up to a factor three within a 2 arcmin diameter field of view. We aim to exploit the AO correction in the visible wavebands (600 to 1000 nm) to achieve on a large FoV AO-assisted speckle holography, in which images are reconstructed from several short exposure frames. We will present the consolidated opto-mechanical design, featuring an 8K fast-frame CMOS, identified to allow this additional mode. We will focus on analysis, trade-offs, simulations, and compromises taken to reach our science objectives, including ways to solve the extra challenge given by a huge amount of data to be acquired and stored while keeping all functionalities of the NIRVANA instrument.