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The Cherenkov Telescope Array (CTA) represents the most advanced facilitydesigned for Cherenkov Astronomy. ASTRI SST-2M has been developed as ademonstrator for the Small Size Telescope in the context of the upcoming CTA.Its main innovation consists in the optical layout which implements theSchwarzschild-Couder configuration and is fully validated for the first time.The ASTRI SST-2M optical system represents the first qualified example for twomirrors telescope for Cherenkov Astronomy.  This configuration permits to (i) maintain a high optical quality across alarge FoV (ii) de-magnify the plate scale, (iii) exploit new technologicalsolutions for focal plane sensors. The goal of the paper is to present theoptical qualification of the ASTRI SST-2M telescope. The qualification has beenobtained measuring the PSF sizes generated in the focal plane at variousdistance from the optical axis. These values have been compared with theperformances expected by design.  After an introduction on the Gamma Astronomy from the ground, the opticaldesign and how it has been implemented for ASTRI SST-2M is discussed. Moreoverthe description of the setup used to qualify the telescope over the full fieldof view is shown.  We report the results of the first--light optical qualification. The requiredspecification of a flat PSF of $\sim 10$ arcmin in a large field of view ~10deg has been demonstrated. These results validate the design specifications,opening a new scenario for Cherenkov Gamma ray Astronomy and, in particular,for the detection of high energy (5 - 300 TeV) gamma rays and wide-fieldobservations with CTA.

First optical validation of a Schwarzschild Couder telescope: the ASTRI SST-2M Cherenkov telescope