A Setup to Study Atomic State Population Dynamics and Optical Polarization at CRYRING@ESR

We present a recently established setup for laser spectroscopy at CRYRING@ESR at the GSI Helmholtz Centre for Heavy Ion Research. Here, laser spectroscopy can be performed on stored and cooled ion bunches and coasting beams. First spectra of ${}^{24,25}$Mg${}^{+}$ ions are presented that were recorded by classical Doppler-limited fluorescence spectroscopy as well as $\mathrm{\Lambda }$-spectroscopy using counter- and copropagating laser beams that are Doppler-shifted by several nm.