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HARMONI is the first light visible and near-IR integral field spectrographfor the ELT covering a large spectral range from 450nm to 2450nm with resolvingpowers from 3500 to 18000 and spatial sampling from 60mas to 4mas. It canoperate in two Adaptive Optics modes-SCAO and LTAO-or with no AO. The projectis preparing for Final Design Reviews. The laser Tomographic AO (LTAO) systemprovides AO correction with very high sky-coverage thanks to two systems: theLaser Guide Star Sensors (LGSS) and the Natural Guide Star Sensors (NGSS). LGSSis dedicated to the analysis of the wavefront coming from 6 laser guide starscreated by the ELT. It is made of 6 independent wavefront sensor (WFS) modulesmounted on a rotator of 600mm diameter to stabilise the pupil onto themicrolens array in front of the detector. The optical design accepts elongatedspots of up to 16 arcsec with no truncation using a CMOS detector from SONY. Wewill present the final optical and mechanical design of the LGSS based onfreeform lenses to minimize the numbers of optical components and toaccommodate for the diversity of sodium layer configurations. We will focus onrotator design, illustrating how we will move 1 tons with 90" accuracy inrestrictive environment. Finally, we will present the strategy to verify thesystem in HARMONI context. The main challenge for the verification being how totest an AO system without access to the deformable mirror, part of the ELT.

HARMONI at ELT: designing a laser guide star wavefront sensors for the ELT