Asynchronous sampling for ultrafast experiments with low momentum compaction at the ANKA ring.

Area of Science:

• Ultrafast spectroscopy
• Condensed matter physics
• Synchrotron radiation science

Background:

• Pump-probe spectroscopy is crucial for studying dynamic processes in materials.
• Achieving high time resolution is essential for capturing ultrafast phenomena.
• Synchrotron light sources offer unique capabilities for advanced experimental techniques.

Purpose of the Study:

• To present a high-repetition-rate pump-probe experimental setup.
• To demonstrate picosecond time resolution using asynchronous sampling.
• To investigate ultrafast structural dynamics in condensed matter.

Main Methods:

• Utilizing the low-α mode at the ANKA synchrotron.
• Implementing asynchronous sampling for time-domain measurements.
• Performing hard X-ray pump-probe experiments.

Main Results:

• Achieved a time resolution better than 1 picosecond.
• Successfully sampled coherent Terahertz (THz) emission.
• Observed and presented examples of phonon dynamics in semiconductors.

Conclusions:

• The developed method enables picosecond resolution for ultrafast dynamics.
• The technique is suitable for probing structural dynamics in condensed phases.
• This approach advances the study of material dynamics at the picosecond timescale.