THz streak camera performance for single-shot characterization of XUV pulses with complex temporal structures

Area of Science:

• Attosecond science and technology
• Ultrafast laser diagnostics
• Particle accelerator physics

Background:

• Free electron lasers (FELs) produce intense ultrashort pulses crucial for various scientific applications.
• Characterizing the duration and timing of these pulses is essential for experimental reproducibility.
• THz-field-driven streak cameras offer single-shot measurement capabilities for FEL pulse diagnostics.

Purpose of the Study:

• To evaluate three computational approaches for determining the duration of FEL pulses with complex temporal structures.
• To validate these methods using numerically simulated FEL pulses under various conditions.
• To compare computational results with experimental data from the FLASH FEL facility.

Main Methods:

• Numerical simulations of FEL pulses with complex temporal profiles.
• Analysis of single-shot spectral measurements (up to three simultaneous spectra).
• Validation of pulse duration retrieval algorithms in both average and single-shot modes.
• Investigation of THz field strength requirements for reliable measurements.

Main Results:

• Demonstrated the accuracy of computational methods for retrieving FEL pulse durations from spectral data.
• Identified optimal THz field strength ranges for robust pulse characterization.
• Successful comparison between numerical simulations and experimental data from the FLASH FEL.

Conclusions:

• The investigated computational approaches are effective for characterizing complex FEL pulses using THz-field-driven streak cameras.
• Accurate single-shot pulse duration and timing jitter measurements are achievable, enhancing FEL operational reliability.
• This work provides a framework for optimizing diagnostic strategies in ultrafast science.