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Slow data acquisition in terahertz time-domain spectroscopy (THz-TDS) hashindered the technique's ability to resolve "fast" dynamics occurring on themicrosecond timescale. This timescale, arguably too slow to be accessed viastandard optical pump-probe techniques relying on ultrafast sources, hosts arange of phenomena that has been left unexplored due to a lack of properreal-time monitoring techniques. In this work, chirped-pulse spectral encoding,a photonic time-stretch technique, and high-speed electronics are used todemonstrate time-resolved THz detection at a rate up to 1.1 MHz. Thisconfiguration relies on a table-top source and a setup able to resolve everyTHz transient that it can generate. We investigate the performance of thissystem at different acquisition rates in terms of experimental noise, dynamicrange, and signal-to-noise ratio. Our results pave the way towards single-pulseTHz-TDS at arbitrarily fast rates to monitor complex dynamics in real-time.

Performance analysis of table-top single-pulse terahertz detection up to 1.1 MHz