Optimization of high-order harmonic generation for the time-resolved ARPES

Liang, Yueying; He, Xinkui; Liu, Liqiang; Wang, Junli; Wang, Shuai; Wei, Zhiyi

doi:10.1140/epjd/s10053-022-00404-8

Cited by 1 publication

(1 citation statement)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A technique that has been pushed to great advances thanks to the availability of table-top ultrafast sources is Angular Resolved PhotoElectron Spectroscopy (ARPES) for the investigation of the electronic energy levels and momenta at the surface of a solid material, resulting in detailed characterization of the energy band dispersion and Fermi surface [10,11]. ARPES can be extended to the time-domain taking advantage of the femtosecond pulse duration of both the laser driver and the XUV radiation, opening the field of time-resolved ARPES (TR-ARPES) [12,13]. ARPES energy resolution is determined largely by the photon energy bandwidth, apart from other significant experimental factors such as the sample surface quality, the geometric alignment, and the space-charge effects.…”

Section: Introductionmentioning

confidence: 99%

Design of a compact time-delay-compensated monochromator for femtosecond pulses in the extreme-ultraviolet

Frassetto¹,

Poletto²

2023

X-Ray Free-Electron Lasers: Advances in Source Development and Instrumentation VI

View full text Add to dashboard Cite

Table-top beamlines based on high-order laser harmonics (HHs) are nowadays lab-based facilities commonly used both for ultrafast experiments on its own sake and in preparatory experiments conceived, ab initio, for large-scale facilities such as FELs. Differently from FELs, HHs are emitted in a broad spectral range, requiring for most experiments the selection of a single harmonic. The monochromatization should preserve the temporal structure of the femtosecond pulse in a so-called time-delay-compensated monochromator (TDCM), where a couple of gratings is used in a configuration to compensate for the pulse-front tilt. At present, TDCMs in the extreme ultraviolet (15 -100 eV) are realized using six optics at grazing incidence: two plane gratings and four toroidal mirrors. The gratings are illuminated by a collimated beam and the mirrors are used to collimate and focus the beam in the two sections of the monochromator: intermediate slit and target area. Here we present the design of a TDCM with four optical elements: two gratings, a cylindrical(spherical) mirror and a toroidal mirror. The gratings are used in the off-plane geometry and are illuminated by a divergent beam. The optical design is discussed in detail giving all the parameters for the definition of the configuration. We present the design of a TDCM for the 15-60 eV region, being a physical realization in progress. The main topics discussed are the beam size at the target area, the residual temporal broadening, the error budget for the alignment and the expected throughput. The design has advantages in terms of costs, compactness, alignment stability and throughput.

show abstract