Intense XUV pulses from a compact HHG setup using a single harmonic

Abstract

We report on a compact and spectrally intense extreme-ultraviolet (XUV) source, which is based on high-harmonic generation (HHG) driven by 395 nm pulses. In order to minimize the XUV virtual source size and to maximize the XUV flux, HHG is performed several Rayleigh lengths away from the driving laser focal plane in a high-density gas jet. As a result, a high focused XUV intensity of 5 × 1013 W/cm2 is achieved, using a beamline with a length of only two meters and a modest driving laser pulse energy of 3 mJ. The high XUV intensity is demonstrated by performing a nonlinear ionization experiment in argon, using an XUV spectrum that is dominated by a single harmonic at 22 eV. Ion charge states up to Ar3+ are observed, which requires the absorption of at least four XUV photons. The high XUV intensity and the narrow bandwidth are ideally suited for a variety of applications including photoelectron spectroscopy, the coherent control of resonant transitions and the imaging of nanoscale structures.

Realization of a Cost-Effective Deformable Grating for the Extreme-Ultraviolet

“…High-order Harmonic Generation (HHG) in gases is a well consolidated process that permits to realize beamlines in a scale range varying from table-top apparatus [1,2] up to big scale facilities [3,4]. Among the great variety of size and complexity, laboratories based on small table-top size beamlines are attractive for their flexibility, allowing to realize a large class of experiments that do not necessitate, or even are not compatible with, the use of large-scale facilities (FELs and synchrotrons).…”

Accessible Tuning of High Harmonics with Abruptly Auto‐Focusing Beams

“…Up to now, selecting or tuning the single or ranges of consecutive harmonics is still a very hot topic due to some spectroscopic applications. [ 9 ] Harmonic selection can be achieved by adopting the short‐wavelength driving laser pulses, [ 21 ] grazing incident plates, [ 22 ] condenser zone plate, [ 23 ] specially designed extreme ultraviolet (XUV) monochromator [ 24 ] and the so‐called optics‐free focusing technique. [ 25 ] The non‐collinear two‐color scenario can angularly separate the harmonics, and one can select the harmonics in space.…”

The design, construction, optimization, and application of self-compression of high energy pulses in gas filled hollow core waveguide

“…The HHG in gas has been well studied. With the powerful ultrafast lasers at different wavelengths are developed, high photon flux coherent XUV and soft X-ray sources based on HHG are under intensive study [162][163][164][165].…”