title: 800-fs, 330-μJ pulses from a 100-W regenerative Yb:YAG thin-disk amplifier at 300  kHz and THz generation in LiNbO₃.
abstract: Yb:YAG thin-disk lasers offer extraordinary output power, but systems delivering femtosecond pulses at a repetition rate of hundreds of kilohertz are scarce, even though this regime is ideal for ultrafast electron diffraction, coincidence imaging, attosecond science, and terahertz (THz) spectroscopy. Here we describe a regenerative Yb:YAG amplifier based on thin-disk technology, producing 800-fs pulses at a repetition rate adjustable between 50 and 400 kHz. The key design elements are a short regenerative cavity and fast-switching Pockels cell. The average output power is 130 W before the compressor and 100 W after compression, which at 300 kHz corresponds to pulse energies of 430 and 330 μJ, respectively. This is sufficient for a wide range of nonlinear conversions and broadening/compression schemes. As a first application, we use optical rectification in LiNbO₃ to produce 30-nJ single-cycle THz pulses with 6 W pump power. The electric field exceeds 10  kV/cm at a central frequency of 0.3 THz, suitable for driving structural dynamics or controlling electron beams.
authors.forename: W
authors.initials: W
authors.lastname: Schneider
authors.forename: A
authors.initials: A
authors.lastname: Ryabov
authors.forename: Cs
authors.initials: C
authors.lastname: Lombosi
authors.forename: T
authors.initials: T
authors.lastname: Metzger
authors.forename: Zs
authors.initials: Z
authors.lastname: Major
authors.forename: J A
authors.initials: JA
authors.lastname: Fülöp
authors.forename: P
authors.initials: P
authors.lastname: Baum