Reducing the pulse repetition rate of an optical frequency comb increases the pulse energy
for a given average power. This enhances the efficiency of nonlinear frequency conversion …

Thorium-doped vacuum ultraviolet (VUV) transparent crystals is a promising candidate for
establishing a solid-state nuclear clock. Here, we report the research results on high …

We report the realization of an intra-oscillator high harmonic source based on a Kerr lens
mode locked Ti: sapphire laser running at 80 MHz repetition rate. A nonlinear medium …

The optimal regime of three-photon resonant excitation of a helium atom via a femtosecond
ultraviolet (UV) pulse was discovered and numerically studied, at which the maximum power …

We report a candidate with unique advantages in the cultivation of solid-state nuclear clock
material, Th: SrF2 crystal. It not only has a segregation coefficient close to 1, which can …

Ultrafast light sources with broadband wavelength tunability, as useful tools for studying
ultrafast phenomena and light-matter interactions, have attracted extensive interests in …

Many applications in fundamental and applied research demand coherent light sources far
beyond the visible or even the XUV and X-ray spectral regions. The XUV is a relatively …