We present a scheme for high-harmonic-generation (HHG) driven by infrared free-electron lasers (FEL), which can be operated at MHz-repetition. Wavelength tunability of FEL enables one to explore HHG from mid-IR pulses for higher cutoff energies above 1 keV. Status of R&D is also presented.
Ultrafast lasers are one of the enabling technologies for X-ray and XUV FEL facilities. The requirements for those facilities’ daily operation and experiments place challenging demands on ultrafast lasers for timing distribution, the electron source, for electron beam manipulation and for pump-probe experiments.
A high harmonics source is used to perform x-ray resonant magnetic scattering on a magnetic sample. The dynamics of laser-induced ultrafast demagnetization are probed with respect to the wavelength of the pump beam. Longer pump wavelengths are found to increase the initial quenching levels.
We presented a monolithic high power random fiber laser with a tandem-pumping scheme. After the two amplifiers, the seed was amplified to 4020 W with an optical-to-optical efficiency of 88.5%, and the 3 dB width was broadened from 0.78 nm to 0.99 nm.