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The Multi‐conjugate Adaptive optics Demonstrator (MAD) is the first multiconjugated adaptive optics system at the Very Large Telescope (VLT). We present  H  and  K  S  observations of the young massive cluster Trumpler 14 revealing the power of MCAO systems by providing a homogeneous Strehl ratio over a large field of view. Mean Strehl ratios of 6.0 and 5.9 per cent with maximum Strehl ratios of 9.8 and 12.6 per cent in  H  and  K  S , respectively, show significant improvement of the spatial point spread function (PSF) stability compared to single‐conjugated adaptive optics systems. Photometry of our observations cover a dynamic range of ∼10 mag including 2–3 times greater number of sources than comparable seeing‐limited observations. The colour–magnitude diagram reveals that the massive cluster originated in a recent starburst‐like event 1 ± 0.5 Myr ago. We tentatively detect hints for an older population of 3 Myr suggesting that low intensity star formation might have been going on in the H ii  region for a few Myr. We derive the luminosity function and mass function between 0.1 and 3.2 M ⊙  and identify a change in the power‐law slope of the mass function at  m  c ∼ 0.53 +0.12  − 0.10  M ⊙ . The MF appears shallow with power‐law slopes of Γ 1 =−0.50 ± 0.11 above  m  c  and Γ 2 = 0.63 ± 0.32 below  m  c .

A benchmark for multiconjugated adaptive optics: VLT–MAD observations of the young massive cluster Trumpler 14 ★