Erlangen 2022 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 20: Precision spectroscopy of atoms and ions (joint session A/Q)
A 20.17: Poster
Mittwoch, 16. März 2022, 16:30–18:30, P
A variable out-coupling optical parametric oscillator for the laser system of the ground hyperfine splitting in muonic hydrogen experiment. — •Ahmed Ouf on behalf of the CREMA collaboration1, Siddarth Rajamohanan1, Lukas Goerner1, and Randolf Pohl2 — 1Johannes Gutenberg-Universität Mainz, QUANTUM, Institut für Physik — 2Johannes Gutenberg-Universität Mainz, QUANTUM, Institut für Physik & Exzellenzcluster PRISMA +, Mainz, Germany
We are working on a measurement of the ground-state hyperfine splitting in the exotic muonic hydrogen atom, i.e. a proton orbited by a negative muon. From this measurement, we will be able to determine the parameters of the magnetization distribution inside the proton. The experiment requires a unique pulsed laser system delivering 5mJ pulses at a wavelength of 6.8 µ m. The laser has to be triggered on detected muons which enter the apparatus at stochastic times with an average rate of about 1000/s. Because of the short 2 µ s lifetime of the muon, the laser has to produce pulses within about 1 µ s after a random trigger. We use a novel Yb:YAG thin-disk laser with a line width less than 10 MHz at 1030nm, whose light output will be shifted in frequency by several OPO/OPA stages in 2 parallel branches at 3.15 µ m and 2.1 µ m, before a DFG yields the intense pulses at 6.8 µ m. To enable easy optimization of the OPOs conversion we have developed an OPO cavity with variable finesse, based on polarization optics. We will present this cavity, an optimized specific PDH locking scheme, and first experimental results.