Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 8: Laser Systems – Optical Methods (joint session K/Q)

Q 8.4: Talk

Monday, March 10, 2025, 12:00–12:15, HS XI ITW

Sub-two-cycle pulses at 1600 nm and in the mid IR from an ultralow-noise fiber-feedback optical parametric oscillator system at 76 MHz — •Johann Thannheimer, Abdullah Alabbadi, Tobias Steinle, and Harald Giessen — University of Stuttgart

We achieve fiber-based self-compression down to sub-two optical cycles (9.5 fs) at 1600 nm with an average power of 620 mW (8.2 nJ) and a 76 MHz repetition rate. A commercial Yb-based pump laser is used to drive a fiber-feedback optical parametric oscillator. The frequency converted pulses are amplified to the Watt scale with an optical parametric amplifier and coupled into a 42-mm-long common single mode fiber. The fiber realizes ultracompact grating-free single stage compression to sub-two optical cycles. An added intra-pulse difference frequency generation stage converts the shot-noise limited few-cycle pulses to tunable ultra-broadband mid-infrared radiation. Beside ultrafast metrology via electro optic sampling, this system is particularly suited for mid-infrared spectroscopy.

Keywords: OPO; OPA; ultrafast; ultrashort