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An Yb:thin-disk laser delivering 615 fs pulses with 17 mJ energy at 3 kHz is harnessed towards generation of single-cycle multi-THz transients with few hundred MV/cm field strength via chirped-pulse difference frequency mixing in large-aperture GaSe crystals.

Sub-cycle transmission measurements of bulk gallium arsenide biased by intense mid-infrared transients reveal a strong blue-shift of the optical absorption when the peak electric field reaches 10 MV/cm, indicating 2D-localization of electronic wave functions.

615fs pulses with 17mJ energy at 3kHz repetition rate are generated by an Yb:thin-disk laser to pump a mJ-class near-IR OPA delivering 25fs pulses. This system targets the generation of intense THz radiation.

Generation of ultrashort and intense laser pulses is the primary motive in ultrafast and nonlinear science. Unfortunately, only a limited number of active media allows for scaling ultrashort pulses to energies greater than a few mJ at kHz repetition rate. For this reason, the available wavelengths are extremely restricted. To drive ultrafast processes in novel frequency domains, the ideal approach is to harness a source of intense pulses suitable for nonlinear frequency conversion at high power and ultrabroad bandwidth. Here we present generation of 615 fs pulses at 1030 nm with 17 mJ energy at 3 kHz repetition rate by a combination of Er/Yb:fiber and Yb:thin-disk technology. This system pumps an optical parametric amplifier (OPA) tunable in the near-IR wavelength range and capable of generating few-ten fs pulses with up to 500 μJ energy.

Combined Er/Yb:fiber and Yb:thin-disk technology produces 615 fs pulses at 1030 nm with an energy of 17 mJ at 3 kHz repetition rate. The sub-ps duration allows efficient white-light generation and optical parametric amplification.

A combination of Er/Yb:fiber and Yb:thin-disk technology produces 615 fs pulses at 1030 nm with an average output power of 72 W. The regenerative amplifier allows variation of the repetition rate between 3 and 5 kHz with pulse energies from 13 to 17 mJ. A broadband and intense seed provided by the compact and versatile fiber front-end minimizes gain narrowing. The resulting sub-ps performance is ideal for nonlinear frequency conversion and pulse compression. Operating in the upper branch of a bifurcated pulse train, the system exhibits exceptional noise performance and stability. published

Noncollinear parametric amplification based on type-II phase matching for the generation of ultrabroadband and tunable spectra in the near infrared is investigated. In a noncollinear geometry the group velocity matching condition between signal and idler can be obtained in frequently used crystals such as β-barium borate (BBO) even for wavelengths fully located in the anomalous dispersion region. The extremely broadband operation, peculiar tuning possibilities and straightforward experimental implementation with the standard BBO crystal pave the way for a versatile NIR source in ultrafast spectroscopy.