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A: Fachverband Atomphysik

A 19: Precision Spectroscopy of Atoms and Ions III (joint session A/Q)

A 19.6: Talk

Wednesday, March 4, 2026, 16:00–16:15, N 3

A single frequency continuous wave OPO laser as powerful and flexible tool for high resolution spectroscopy — •Jakob Weiß¹, Katrin Weidner¹, Raphael Hasse¹, Thorben Niemeyer¹, Matou Stemmler¹, Klaus Wendt¹, and Sapida Akhundzada² — ¹Johannes Gutenberg-Universität Mainz — ²Hübner GmbH & Co. KG, Division HÜBNER Photonics, Kassel

Optical parametric oscillators (OPOs) pumped at 780 nm provide widely tunable laser radiation, covering almost the entire spectral range from 510 nm up to 3400 nm (including SHG). The possibility of automated continuous wave operation with line widths in the order of 1 MHz makes them extremely versatile tools for precision spectroscopy. Remaining limitations in the width and speed of continuous frequency scanning as well as coarse linewidth adjustment over large spectral ranges are presently addressed for enabling specific spectroscopic applications in atomic and molecular spectroscopy.

Feasibility studies are carried out using the C-WAVE GTR (HÜBNER Photonics) for investigations on the hyperfine structure of Fe isotopes by resonance ionization spectroscopy and in photodetachment studies on molecules, for which in both cases a smooth and well controlled tuning behavior of the laser frequency is a fundamental requirement. For this purpose a continuous, high-resolution fine-range scan mode as well as a wide-range coarse-scan algorithm have been developed to provide quick and flexible wavelength access, enhancing the versatility of the C-WAVE GTR and its suitability for advanced spectroscopic applications.

Keywords: OPO laser; precision spectroscopy; frequency scanning; cw laser