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The Cherenkov Telescope Array (CTA) observatory for very high-energy gammarays will consist of about a hundred of imaging atmospheric Cherenkovtelescopes (IACTs) of different size with a total reflective area of about10,000 m$^2$. Here we present a novel technology for the production of IACTmirrors that has been developed in the Institute of Nuclear Physics PAS inKrakow, Poland. The mirrors are made by cold-slumping of the front reflectingaluminium-coated panel and the rear panel interspaced with aluminium spacers.Each panel is built of two glass panels laminated with a layer of a fibreglasstissue in between for reinforcement of the structure against mechanical damage.The mirror structure is open and does not require a perfect sealing needed inclosed-type designs. It prohibits water to be trapped inside and enables aproper ventilation of the mirror. Full-size hexagonal prototype mirrorsproduced for the medium-sized CTA telescopes will be presented together withthe results of recent comprehensive optical and durability tests. Their designwill be compared to the earlier technology developed at INP PAS that used arigid flat open support structure with a reflective layer made by cold-slumpingof the coated glass panel to the cast-in-mould spherical epoxy resin layer.

Developments of a new mirror technology for the Cherenkov Telescope Array