Generation of high-flux attosecond extreme ultraviolet continuum with a 10 TW laser

Abstract

We report a laser system that delivers 15 fs pulses with 200 mJ energy at a 10 Hz repetition rate. The broadband spectrum extending from 700 nm to 900 nm was obtained by seeding a two-stage Ti:sapphire chirped-pulse power amplifier with sub-mJ white-light pulses from a gas-filled hollow-core fiber. With this laser, an extreme ultraviolet (XUV) super-continuum supporting 230 as isolated attosecond pulses at 35 eV was generated using the generalized double optical gating technique. The XUV pulse energy was ∼100 nJ at the exit of the argon gas target.

Spatio–spectral structures in high-order harmonic beams generated with Terawatt 10-fs pulses

“…The single-shot acquisition allows overcoming fluctuation issues of the driving pulses and gives access to instantaneous measurement of physical quantities instead of averaged values. In our conditions, we observed highly structured spectra in strong contrast to the smooth spectra commonly reported using high-energy few-cycle pulses 16,38,39 .…”

Adaptive-feedback spectral-phase control for interactions with transform-limited ultrashort high-power laser pulses

“…Similar to the pulse duration which was independently measured using the FROG technique, we verified the validity of the measurement using independent techniques based on second harmonic generation (SHG) [8,10] and XPW generation [16]. The SHG and XPW spectra at the target point with different frequency chirp values were measured in vacuum.…”

“…Several technologies have recently been demonstrated to precisely control the spectral phase for ultrafast laser pulses [7][8][9][10]. In particular, an adaptive spectral phase closed-loop feedback system has the capability to measure the spectral phase using a self-referenced spectral interferometer (SRSI) [11], and it is able to precisely control the spectral phase by means of an acoustic optic programmable dispersive filter (AOPDF) [7].…”

Multi-μJ harmonic emission energy from laser-driven plasma

“…However, due to intrinsic processes associated with this generation mechanism, there is a maximum laser pulse intensity that can be used with the consequence of limiting their brightness and severely restricting the scope of applications [2,3]. Techniques like the loose-focusing [4][5][6][7] or the double optical gating [8] have been implemented to enhance the XUV flux and exploit higher laser energies from modern laser systems. More recently using these techniques, a tabletop source delivering 2.6 GW power in a single attosecond pulse was reported [9].…”