A table-top monochromator for tunable femtosecond XUV pulses generated in a semi-infinite gas cell: Experiment and simulations

Abstract

We present a new design of a time-preserving extreme-ultraviolet (XUV) monochromator using a semi-infinite gas cell as a source. The performance of this beamline in the photon-energy range of 20 eV to 42 eV has been characterized. We have measured the order-dependent XUV pulse durations as well as the flux and the spectral contrast. XUV pulse durations of ≤ 40 fs using 32 fs, 800 nm driving pulses were measured on target. The spectral contrast was better than 100 over the entire energy range. A simple model based on the strong-field approximation (SFA) is presented to estimate different contributions to the achieved XUV pulse duration. On-axis phase-matching calculations are used to rationalize the variation of the photon flux with generation pressure and intensity.

Time-resolved photoelectron imaging with a femtosecond vacuum-ultraviolet light source: Dynamics in the A∼/B∼- and F∼-bands of SO2

“…Refs. 11,12 and references therein), which have brought XUV-TRPES into reach 1315 . While this is an extremely promising method with the potential of substantially broadening the scope of TRPES by giving access to multiple nal states and element-specic core shells, XUV-TRPES suffers from the background signal contributed from the ionization of unexcited molecules.…”

Generation of coherent extreme ultraviolet radiation from α–quartz using 50 fs laser pulses at a 1030 nm wavelength and high repetition rates

“…Thus, the current experimental apparatus generates ∼5 × 10 9 photons at 15.6 eV per second at 10 kHz and ∼3.5 × 10 10 photons per second at the maximum repetition rate of 200 kHz. Compared to optimized gas sources [27,28] our measured photon flux per laser shot is of the same order of magnitude, but our result surpasses them in the number of photons generated per second.…”

A time- and angle-resolved photoemission spectroscopy with probe photon energy up to 6.7 eV

“…The other class of the probe pulse is generated through high-harmonic generations (HHG) process in gas phases. Such HHG probe pulse usually has much shorter wavelength (scale of 10 nm) and shorter pulse duration (<50 fs) than that from nonlinear process in crystals [28][29][30][31][32][33][34][35] . However, such probe pulse is usually broad in frequency due to the Fourier transform limit and has dramatic space charge effect in photoemission due to the low repetition rate, making it difficult to achieve high energy resolution in trARPES experiment.…”