Simple quasi-phase-matching in high-order harmonic generation


We demonstrate a simple technique for enhancing harmonic conversion yields by an array of gas interaction zones.

Direct experimental test of quantum non-commutativity by single photon creation and annihilation


We have implemented simple sequences of photon addition and subtraction to/from a light field. By verifying the difference in the final states when using the two operators in reverse order, we provide the first direct test of quantum commutation rules.

Single-photon remote temporal delocalization and violation of a Bell’s type inequality



We have remotely delocalized a single photon onto two distinct and widely separated temporal modes. The tomographic analysis of the two-mode homodyne data has allowed us to prove (under some assumptions) the violation of a form of Bell’s inequality.

Direct interferometric measurement of atomic dipole phases in high-order harmonic generation



We have used an interferometric technique to directly measure the intrinsic nonlinear phase related to the different electronic trajectories involved in high-order harmonic generation in the XUV.

The 2005 Nobel Prize in Physics awarded to Theodor W. Hänsch

Ted Hänsch and Marco Bellini performed one of the key experiments leading to the invention of the femtosecond frequency comb (and, later, to the Nobel prize) in Florence.

In 1997, we demonstrated the coherence in the process of supercontinuum generation that was the starting point to conceive the possibility of generating ultra-broadband self-calibrating optical frequency combs.

The experiment showing high-contrast white-light interference fringes

First experimental photon addition



First realization of single-photon-added coherent states. We have generated and analyzed novel states of light that continuously change their character from fully quantum to fully classical.

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