SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 10: Photonics I
Q 10.4: Vortrag
Montag, 6. März 2023, 18:00–18:15, E001
Femtosecond Fast Tunable Ultraviolet Radiation through Non-collinear Sum-frequency Mixing in a Visible NOPO — •Fridolin Geesmann1, Robin Mevert1,2, David Zuber1,2, Han Rao1,2, and Uwe Morgner1,2,3 — 1Institute of Quantum Optics, Leibniz Universität Hannover, Hannover, Germany — 2Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering-Innovation Across Disciplines), Hannover, Germany — 3Laser Zentrum Hannover e.V., Hannover, Germany
We report on a rapidly tunable non-collinear optical parametric oscillator (NOPO), which simultaneously delivers femtosecond pulses in the visible and ultraviolet wavelength range. The system is pumped by the third harmonic of a Yb based MOFA system, which is focused into a BBO crystal to generate the visible pulses via a DFG process. A KDP crystal is placed in a second focus of the NOPOs ring cavity for further frequency conversion. Thereby, ultraviolet wavelengths were reached through non-collinear sum-frequency mixing of the visible pulses with residual infrared pump radiation. With this approach, two synchronized outputs were realized, delivering fast tunable pulses from 449-690 nm and 340-413 nm with output powers up to 232 mW and 59 mW, respectively. By replacing the visible output coupler with an HR mirror, even higher power in the UV of up to 90 mW was achieved. In addition, the quick tuning of the two outputs was shown over their entire wavelength range with a frequency of 43.9 Hz. Even higher tuning speeds can be expected by using a different piezoelectric actuator, as this has been the limiting factor so far.