An innovative Yb-based ultrafast deep ultraviolet source for time-resolved photoemission experiments

Area of Science:

• Solid-state physics
• Ultrafast spectroscopy
• Materials science

Background:

• Time- and angle-resolved photoemission spectroscopy (TARPS) is crucial for understanding ultrafast electronic dynamics in solids.
• Existing techniques may have limitations in temporal or energy resolution.
• Advanced optical setups are needed to push the boundaries of experimental capabilities.

Purpose of the Study:

• To introduce an innovative optical setup for time- and angle-resolved photoemission spectroscopy.
• To achieve high temporal and energy resolution for studying electronic dynamics.
• To demonstrate the setup's capabilities using a BiTeI semiconductor.

Main Methods:

• Utilized a 100-kHz Yb laser source.
• Employed non-collinear optical parametric amplification and sum-frequency generation.
• Generated ultrashort pump (1.82 eV) and ultraviolet probe (6.05 eV) pulses.

Main Results:

• Achieved an overall temporal resolution of 85 fs.
• Obtained an instrumental energy resolution of 50 meV.
• Successfully demonstrated the setup's performance with time- and angle-resolved measurements on BiTeI.

Conclusions:

• The presented optical setup offers significant improvements in resolution for ultrafast spectroscopy.
• This innovative system enables detailed investigations of electronic dynamics in solids.
• The demonstrated capabilities pave the way for new discoveries in condensed matter physics.