Henry C. Kapteyn

TL;DR: By guiding a mid-infrared femtosecond laser in a high-pressure gas, ultrahigh harmonics can be generated that emerge as a bright supercontinuum that spans the entire electromagnetic spectrum from the ultraviolet to more than 1.6 kilo–electron volts, allowing, in principle, the generation of pulses as short as 2.5 attoseconds.

TL;DR: Phase-matched harmonic conversion of visible laser light into soft x-rays was demonstrated and the recently developed technique of guided-wave frequency conversion was used to upshift light from 800 nanometers to the range from 17 to 32 nanometers.

TL;DR: By carefully tailoring the shape of intense light pulses, this work can control the interaction of light with an atom during ionization, improving the efficiency of X-ray generation by an order of magnitude.

TL;DR: In this paper, the authors review progress in the development of high peak-power ultrafast lasers, and discuss in detail the design issues which determine the performance of these systems, and summarize some of the new scientific advances made possible by this technology, such as the generation of coherent femtosecond x-ray pulses, and the MeV-energy electron beams and high-energy ions.

TL;DR: In this article, a Ti:sapphire laser centered at 800nm, with 26fs pulse duration, was used to generate coherent soft x-ray harmonics, at wavelengths down to 2.7nm (460eV) in He, and 5.2nm (239eV).