Speaker
Description
Low-energy properties of the nuclei can be precisely examined via highly accurate measurements of atomic transitions. As the Bohr radius of hydrogen-like atoms decreases with increasing orbiting particle mass, the muonic atoms (hydrogen-like atoms formed by a negative muon and a nucleus) have enhanced sensitivity to nuclear structure effects. The HyperMu experiment is motivated to measure this transition with 1 ppm accuracy in order to deduce the so called two-photon-exchange (sum of Zemach radius and polarizability contributions) contribution with a relative accuracy of 1x10-4. This experiment which is at the crossover between particle, atomic and nuclear physics requires the development of cutting-edge laser technologies especially in the thin-disk laser and the mid-infrared laser domains. The mid infrared source needed for this experiment is realised starting from a single-frequency thin-disk laser operating in the 300 mJ regime and down-converting its pulses in a cascade of nonlinear processes to produce single-frequency pulses of 5 mJ energy at 6800 nm within 1 microsecond after laser trigger. Here, the status and prospects of HyperMu experiment are presented with focus on the recent developments of the midinfrared laser system at PSI.
