Visualizing femtosecond dynamics with ultrafast electron probes through terahertz compression and time-stamping

Abstract

Visualizing ultrafast dynamics at the atomic scale requires time-resolved pump-probe characterization with femtosecond temporal resolution. For single-shot ultrafast electron diffraction (UED) with fully relativistic electron bunch probes, existing techniques are limited by the achievable electron probe bunch length, charge, and timing jitter. We present the first experimental demonstration of pump-probe UED with THz-driven compression and time-stamping that enable UED probes with unprecedented temporal resolution. This technique utilizes two counter-propagating quasi-single-cycle THz pulses generated from two OH-1 organic crystals coupled into an optimized THz compressor structure. Ultrafast dynamics of photoexcited bismuth films show an improved temporal resolution from 178 fs down to 85 fs when the THz-compressed UED probes are used with no time-stamping correction. Furthermore, we use a novel time-stamping technique to reveal transient oscillations in the dynamical response of THz-excited single-crystal gold films previously inaccessible by standard UED, achieving a time-stamped temporal resolution down to 5 fs.

arXiv comment13 pages, 5 figures

References in corpus (13)

• Terahertz-driven linear electron acceleration
• Segmented Terahertz Electron Accelerator and Manipulator (STEAM)
• Direct measurement of sub-10 fs relativistic electron beams with ultralow emittance
• Petahertz optical response in graphene
• Acceleration of relativistic beams using laser-generated terahertz pulses
• Achieving 50 femtosecond resolution in MeV ultrafast electron diffraction with a double bend achromat compressor
• THz-driven ultrafast spin-lattice scattering in amorphous metallic ferromagnets
• Femtosecond compression dynamics and timing jitter suppression in a terahertz-driven electron bunch compressor
• Femtosecond relativistic electron beam with reduced timing jitter from THz-driven beam compression
• Ultrafast electron calorimetry uncovers a new long-lived metastable state in 1T-TaSe${}_2$ mediated by mode-selective electron-phonon coupling
• Terahertz oscilloscope for recording time information of ultrashort electron beams
• Electron cooling and Debye-Waller effect in photoexcited bismuth
• Demonstration of sub-luminal propagation of single-cycle terahertz pulses for particle acceleration

Cited by in corpus (1)

• Non-invasive time-sorting in radio-frequency compressed ultrafast electron diffraction