Mainz 2026 – wissenschaftliches Programm
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 2: Laser Systems and their Applications II
K 2.2: Vortrag
Montag, 2. März 2026, 17:15–17:30, HS 20
Compact Shot-Noise Limited Multipass OPO providing Watt-Scale, Femtosecond Pulses — •Johann Thannheimer1, Florent Kadriu1,2, Philipp Flad1, Tobias Steinle1,2, and Harald Giessen1 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Stuttgart, Germany — 2SI Stuttgart Instruments GmbH, Stuttgart, Germany
We present an efficient, high power, tunable, shot-noise limited, truly single-stage, ultrashort pulse source with an excellent spatial profile. High power ultrafast lasers are essential light sources for a many applications such as ultrafast spectroscopy, bioimaging and medical ablation. The limited number of laser gain media that simultaneously provide a large gain bandwidth and high gain limits ultrafast lasers to only a few central wavelengths. Optical parametric oscillators (OPO) are inherently broadly tunable, but limited to either a high gain or a broad bandwidth. The traditional solution to this are cascading amplification stages, increasing system footprint and cost. Our novel multipass parametric amplifier (MPA) [Nägele et al. Nature 647, 74 (2025)] combines multiple passes through a single nonlinear crystal with dispersion engineered coatings to reset the dispersion and drop the idler, simultaneously achieving a broad bandwidth and high gain. In this work the MPA is implemented in a fiber-feedback cavity as an oscillator (FFMOPO). This allows us to forgo a seed OPO, decreasing the system footprint and cost. Signal powers over one Watt at pulse durations around 100 fs are achieved with a system conversion efficiency of around 40 % and a tuning range of over 400 nm.
Keywords: nonlinear optics; frequency conversion; ultrafast; laser; OPO