Photonic time-stretch is a very efficient technique for recording THz signals in single-shot, with high MHz-rate repetition rates. However, up to now, the range of applications suffered from the high cost of the oscilloscopes (or ADC boards) required for the readout, often in the 8-30 GHz range. We present a design for a single-shot THz digitizer (or time-domain spectrometer) using mid-IR probes, and low bandwith oscilloscopes (down to 1 GHz). Measurements at the THz beamline of synchrotron SOLEIL will be presented. Performances in terms of effective number of points versus costs will also compared to state-of-art single-shot TDS systems. These new designs are expected to considerably extend the application range of high repetition rate single-shot electro-optic detection and time-domain spectroscopy.
Recording complex terahertz pulse shapes in single-shot is needed in various applications, ranging from terahertz time-domain spectroscopy to real-time accelerator diagnostics. Among existing solutions, association of photonic time-stretch with electro-optic detection has been shown to provide the highest repetition rates. However a fundamental bottleneck in time resolution and bandwidth has severely limited those strategies so far. We present here the first demonstration of a time-stretch ADC, that is no more subjected to this time-resolution limit, by using the DEOS (Diversity Electro-Optic Sampling) reconstruction method [1]. Experiments are performed on the ELBE intense Terahertz source.
[1] Roussel et al., Light Science & Applications 11, 14 (2022) https://doi.org/10.1038/s41377-021-00696-2
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