Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 24: Laser Development and Applications (Spectroscopy) (with Q)

A 24.1: Vortrag

Mittwoch, 8. März 2017, 14:30–14:45, P 5

A pulsed single-mode Ti:sapphire laser for high-resolution resonance ionization spectroscopy — •Dominik Studer¹, Tobias Kron¹, Sebastian Raeder², Volker Sonnenschein³, Pascal Naubereit¹, and Klaus Wendt¹ — ¹Institut für Physik, Johannes Gutenberg-Universität Mainz — ²GSI Darmstadt — ³Department of Quantum Engineering, Nagoya University

Resonance ionization spectroscopy (RIS) is a well-established technique for both atomic and nuclear research. Through the stepwise excitation and ionization of an atom individual transitions can be probed, allowing the extraction of fundamental parameters, such as isotope shifts and nuclear moments, provided an adequately narrow experimental linewidth is realized. Due to their high reliability and stability, pulsed Ti:sapphire lasers as designed at JGU Mainz are used at on-line laser ion sources worldwide. The standard design features a Z-shaped standing wave cavity, pumped by a frequency-doubled Nd:YAG laser with a repetition rate of 10 kHz. The output power reaches up to 4 W with pulse lengths of 40 ns. Frequency selection is achieved by a combination of a Lyot-Filter and a thin Etalon, resulting in a spectral linewidth of ≈5 GHz. Operation on a single longitudinal mode can be achieved using a ring cavity design featuring an additional air-spaced etalon, resulting in ≈50 MHz linewidth. Compared to the previously used technique of injection-locking, this design implies an unseeded single-mode operation, greatly reducing the complexity of the system. Moreover the wavelength range is not constrained by a master laser, allowing easy set-up and scanning operation.