Abstract
Multi-color pump-probe techniques utilizing modern accelerator-based 4th generation light sources such as X-ray free electron lasers or superradiant THz facilities have become important science drivers over the past 10 years. In this type of experiments the precise knowledge of the properties of the involved accelerator-based light pulses crucially determines the achievable sensitivity and temporal resolution. In this work we demonstrate and discuss the powerful role pulse- and field-resolved- detection of superradiant THz pulses can play for improving the precision of THz pump - femtosecond laser probe experiments at superradiant THz facilities in particular and at 4th generation light sources in general. The developed diagnostic scheme provides real-time information on the properties of individual pulses from multiple accelerator based THz sources and opens a robust way for sub femtosecond timing. Correlations between amplitude and phase of the pulses emitted from different superradiant THz sources furthermore provide insides into the properties of the driving electron bunches and is of general interest for the ultra-fast diagnostics at 4th generation light sources.
Highlights
Time resolved pump-probe experiments play a key role in understanding of fundamental processes in material sciences as well as in life sciences
In this work we demonstrate and discuss the powerful role pulse- and field-resolved- detection of superradiant THz pulses can play for improving the precision of THz pump - femtosecond laser probe experiments at superradiant THz facilities in particular and at 4th generation light sources in general
It consists of two arrival-time-monitor systems (ATM) which detect the THz pulses from the coherent diffraction radiator (CDR) source and the undulator source in parallel, one pyroelectric detector to independently determine the THz intensity from the undulator, and a sequential time-domain spectroscopy set-up which serves for a the benchmark experiment
Summary
Time resolved pump-probe experiments play a key role in understanding of fundamental processes in material sciences as well as in life sciences. Since the stability of accelerator-based light sources, especially with respect to timing jitter and pulse intensity, is inferior to typical optical lasers, the achievable dynamic range, precision and sensitivity depends heavily on sophisticated schemes that provide information on all relevant pulse properties [11,12]. We present a recent upgrade of the prototype real-time diagnostics at the superradiant THz facility TELBE [5] towards implementing pulse- and field- resolved diagnostics of two independent and conceptually different THz emitters, a coherent diffraction radiator (CDR) and an undulator. The performance of this upgrade is benchmarked by a time-domain spectroscopy experiment detecting and characterizing the THz pulses emitted from the THz undulator. The proposed scheme of sequential arrival time monitor provides better temporal resolution than precedented ones, as the effect of timing jitter between the two THz radiation sources is substantially reduced [13]
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