Description
The attosecond dynamics of strong-field-driven electrons is sensitive to the sub-cycle temporal and polarization structure of the driving field. We experimentally investigated the dissociative ionization of molecular hydrogen in intense laser field using shot-to-shot carrier-envelope phase (CEP) tagging and polarization control of few-cycle infrared pulses having 1030 nm central wavelength [1]. Three-dimensional proton momenta were reconstructed using ion-ion coincidence imaging at the reaction microscope end station [8] of the Extreme Light Infrastructure (ELI) Attosecond facility connected to the HR Gas beamline [9], driven by the HR-1 laser system [6]. The CEP was measured at the laser output using a Stereo time-of-flight spectrometer based on Above Threshold Ionization (Stereo-ATI) device [2,7] and tagged individually to the detected particles at each laser shot [2]. We benchmarked the in-situ CEP-tagging procedure by the known phase-sensitivity of low kinetic energy fragmentation pathways [3, 4]. Specifically, the proton yield asymmetry at multiple ion kinetic energies were retrieved as a function of CEP using linearly and elliptically polarized driving laser pulses with the same peak intensity.
References:
[1] S. Hädrich et al. 2022 Opt. Lett. 47, 1537
[2] T. Rathje et al. 2012 J. Phys. B: At. Mol. Opt. Phys. 45, 074003
[3] Han Xu et al. 2013 New J. Phys. 15, 023034
[4] Kling et al. J. Phys. B: At. Mol. Opt. Phys. 50 (2017) 172001
[5] Kling, M. F. et al. Science 312.5771 (2006) 246-248.
[6] S. Hädrich et al. 2016 Opt. Lett. 41, 4332-4335
[7] G. G. Paulus et al. Phys. Rev. Lett. 91, 253004
