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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 2: Laser Systems and their Applications II

K 2.3: Vortrag

Montag, 2. März 2026, 17:30–17:45, HS 20

Continuous-wave injection-seeded multipass OPA for direct 1 W, 76 MHz, sub-50 fs pulse generation at 1.5*1.7 *m — •Florent Kadriu, Johann Thannheimer, Philipp Flad, Tobias Steinle, and Harald Giessen — University of Stuttgart 4th Physics Institute

Generating sub-50 fs laser pulses in the near-infrared via nonlinear down-conversion is fundamentally limited by the trade-off between amplification bandwidth and achievable gain. Conventional approaches based on OPOs or OPO/OPA combinations often require several amplification stages, adding significant complexity. A cw-seeded OPA can eliminate the need for an additional OPO, but such setups typically remain elaborate multi-stage systems. Here, we present a cw-seeded, extremely compact, and low-noise OPA based on our recently introduced multipass-OPA technology (Nägele et al.,*Dispersion-engineered multipass optical parametric amplification,* Nature 647, 74*79 (2025)). The system delivers Watt-scale average power in sub-50 fs pulses and is continuously tunable from 1.5 to 1.7 *m, offering a simple and efficient alternative to conventional multi-stage near-IR ultrafast sources.

Keywords: Optical parametric amplification; Continuous-wave seeded OPA; Optical parametric downconversion; sub-50 fs pulse generation