Abstract
We review a complete solution to generate polarization-controllable, table-top, isolated attosecond pulses
[Nature Photonics, 12, 349 (2018)] – that is realized by adjusting the ellipticity of counter-rotating few-cycle
polarized fundamentals for non-collinear high harmonic generation. The polarization state of the attosecond
pulses was fully analyzed with an EUV polarimeter composed of two rotatable sets of triple-reflection
polarizers, which unambiguously determines the ellipticity and helicity of attosecond pulses.
Furthermore, the isolation property, the pulse contrast and coherence time of EUV pulses was characterized
by a Fourier-transform field autocorrelation. The proposed polarization control scheme is simple and robust,
and enables the real-time measurement of the basic process associated with energy and angular
momentum transfer between the electron/spin system and symmetry-dependent characteristics in molecules
and materials with unprecedented temporal resolution.
