EUROPHOTON 2022

We demonstrate a spatially-multiplexed dual-comb 250-MHz OPO from a single linear cavity. The adjustable repetition-rate difference is 4.1 kHz. Each idler comb has >200 mW average power at 3.5 𝜇m with 30 nm bandwidth. The OPO is wavelength-tunable from 1.36 $\mu$m to 1.7 $\mu$m and 2.9 $\mu$m to 4.17 $\mu$m.

We present an inline mid-infrared source based on intrapulse-difference-frequency-generation and subsequent optical parametric amplification, with pump recycling. Driven by an Yb-doped-fiber amplifier at 1030 nm, at a repetition rate of 250 kHz, the source delivers 1 $\mu$J 73 fs pulses at 8 $\mu$m, corresponding to an unprecedented efficiency of 2%.

We present the concept and first results of a novel OPCPA system with highly-efficient, broadly-tunable UV conversion for XUV/VUV FEL seeding. The start-to-end simulation allows to predict the system performance regarding tunability, beam-quality, stability and pointing, depending on the measured input parameters and fluctuations of the high-power CPA pump laser.

The visible spectral range is difficult to cover by non-parametric laser gain media. Therefore, optical parametric oscillators offer a versatile solutions to this problem but have rather low tuning speeds. We demonstrate a quickly tunable, high power, femtosecond, noncollinear optical parametric oscillator which covers nearly the entire visible spectral range.

We present a LWIR OPCPA containing a fs Cr:ZnS laser as front-end. Sub-200 fs idler pulses at 11.4 µm with 50 µJ energy are generated in the 1 kHz pulse train.